Check engine light came on - the code said it was a loose gas cap - they checked for leaks and reset the code, no charge
Complete hybrid failure caused by some error code. Dealer cleared the code and the car drives perfect again.
Ever since the hybrid failure, MPG has topped out to 37-39 MPG. Dealer tested everything out and can't find anything wrong. This car gets NOWHERE NEAR the 48-51 EPA MPG. If I wanted 39 MPG, I would have bought a Ford Focus.
Making loud rattle noise/shake under hood on initial startup. Would go away after warmup. Toyota recommended having it towed to shop and sent tow truck. Dealer had car for 2 days. Has made same noise 1 time since. Replaced intake manifold.
Plug In Hybrid making unusual knocking noise when under the moderate load to the engine. Dealers could not find the problem and deemed as normal operation. I had Regular Prius Hybrid (Not Plug In), and never had this issue before.
Smell coming from engine bay. Fixed by replacing sponge at engine bay.
Timing chain knocking to engine body during cold start
Engine metal knocking during cold start. Replaced fuel injector and manifold. Problem still occured. Root cause was carbon deposit on fuel injector causing the morning cold start knocking. Needed special coated fuel injector.
Engine ran rough with a knocking noise on cold start. Found a TSB mentioning the problem and fix of replacing intake manifold. Shop couldn't reproduce the problem but fixed according to TSB
Stone came through opening in front and damaged inverter cooling radiator. Coolant was lost and inverter failed and was ruined. Cost was covered by road hazard insurance
Note: Prius has no grill work in front opening to catch stones
Rough start after cold soak per TSB
Oil warning light directing me to take the car to the dealer where I bought it.
extremely retarded valve timing. replaced camshaft oil control valve
Replaced VVTI Gear for $2800 (Extended Warranty covered 100%). But noticed large amount of carbon deposits. My mileage has dropped to 32mpg from my previous average of 55-58.
Hybrid battery died. $11k to repair. I was out of warranty but Toyota stepped up and paid all but 2900 of it as a courtesy gesture after I bitched to corp for a few days.
Oil consumption of 1.5qt every 5,000 miles. Toyota states it's not a problem until consumption is 1 qt every 1500 miles. With oil change intervals of 10,000 miles I see this as an issue. Toyota will not repair under extended warranty.
Poor mileage, so replaced PCV valve. Valve is located under intake manifold, so replacement requires working above and below engine
Motor mount replaced under T-SB-0204-11 to fix vibration. The new motor mount seems to have made things worse instead of better.
The new motor mount actually made the vibration a little worse, but never tried to get it fixed because the new mount was the fix.
Intake manifold replacement (vehicle failed to start in cold weather)
Hybrid system (check hybrid system error came on). Dealer could not localize problem. Possibilities included the battery fan and high humidity in the battery compartment. No repairs made and problem has not recurred.
Started losing oil last August. Checked over, compression test to confirm. Put in new block. Freak thing and not normal at all. Probably should have changed oil more often than every 10000 km.
Blown head gasket
Engine overheat at high power only. Replaced Electric engine water pump.
Cylinder 3 misfire. Dealer cleared code and it did not come back on. Engine, battery and system checked out OK.
Fuel problem. EGR valve clogged. No reason this car should have an EGR valve.
Intelligent Power Module failure.
Hybrid battery needed changing - was changed for free under extended guarentee
Engine set P003 code after rough start on cokd soak. Intake manifold and EGR gasket replaced per TSB. Asked for help on price due to TSB, declined due to miles on car.
Broken spring inside the oil filter canister, I think.
When engine started, it sounded like rocks were in it. Problem has been reported by other 2010 Prius owners (see youtube videos).
Transistors for power inverter burned out
Traction battery capacity was reduced significantly
intake manifold changed under warranty
Hybrid system hesitation during extreme heat after parked for several hours (hot battery pack). Possible protection mode, but wanted to be sure. Dealer attempted reproduction, then told it was normal, and discouraged "battery mode use".
Hybrid system sluggish, not using battery power when battery hot. Battery gets hot easily.
Hybrid performance poor when battery is above 45°C. Battery easily heats to or above this temp during normal use. Car sluggish in this state and has poor fuel economy.
Poor fuel economy when hybrid battery hot. Battery easily gets heated and takes a while to cool, partially due to heat soak, partially due to not cabin. 20% drop in FE.
Check engine light came on. Dealer installed software update.
Complete system failure, every light lit up on dash, no regen braking. Dealer said they are replacing most of the braking system including master cylinder, etc. Have Toyota extended warranty, told it would cost over $4500 otherwise.
P2A00 check engine code.
Defective front oxygen sensor 89467-28090. Replaced it. Problem solved.
Prius is burning oil. 1qt per 500 miles
oxygen and fuel / air sensor replaced
Car sounds like a truck when starting up. Brought it to the dealer in Downey. Dealer refused to follow Toyota Service Bulletin explaining the problem. Told me it expired at end of April. So did NOTHING.
Piece of bottom shield came loose, was hanging down to the ground, attached at the front and hanging down behind - front right side, ~12 inches long, 4-5 inches wide. They resecured it with clips.
Part of the splash shield broke due to a clip falling off at some point. They had to replace the front right fender (wheel well) lining. $120 parts and $40 labor.
Water pump Emissions valve
My car failed its emission inspection. I took it to the dealer and was told I needed to drive it on at least 3 trips of at least 75 miles each to "reset" the computer.
I haven't actually taken it to be repaired yet; my impression is that the car jumps forward at times when I hit the brakes. It happens intermittently, not constantly.
Water pump failed (not the hybrid electric one). Caused all kinds of mischief with the electrical system, had to be towed to the shop.
Replace timing cover gasket due to engine oil leak. Replace valve cover gasket due to engine oil leak. OCV Sensor broken. Replaced.
coolant control valve
coolant flow control valve
Replaced the electric hybrid water pump.
replace inverter coolant pump
p1121 code from ck egg. lite. Replaced flow control valve
The recirculating valve for the A/C unit (coolant side) opened slowly causing a check engine light.
Service engine light went on. A scan indicated that the number 4 cylinder was misfiring. Ordered a used ignition coil from eBay and that fixed the problem. Note that a new ignition coil goes for over $100 plus mechanic's labor cost.
Evidence of crankcase pressure - had PCV valve replaced as precaution.
Coolant valve stuck shut, engine overheated causing service light to come on
Exhaust mounting bracket weld had broken. Local private Tyre and Exhaust company was able to improvise repair with metal clamp which worked perfectly. fixed free-of-charge.
I had the check engine light go on, and when the dealership checked into it it was a stuck coolant fluid control valve. I basically paid $250-$300 for them to reset the code as they were replacing and flushing my coolant anyway.
Hybrid Cooling Pump recall hadn't been done; it left us stranded. Towed via AAA to nearest dealer and repaired at not cost.
Can't completely fill up the gas tank. They told me the gas tank has a bladder in it and probably because of it being so cold it won't fill up all the way. I should wait and see if it gets better when it warms up outside.
Battery was found to be inadequate when I took the car in due to a "check engine" light that turned out to be caused by a defective gas cap.
Water pump replaced as it was beginning to leak. Cost of about 250
The dealer technician noticed cracking in the drive belt. They replaced the drive belt with no problems. No problems since.
Thermostat on coolant pump that pumps hot coolant to a thermos tank next to the engine failed and had to be replaced.
replaced water pump
Replaced inverter cooling pump under recall
Transmission drain and fill Replc Pcv valve
emission check engine p0456
replace fuel tank failed emmision test
Water pump was leaking, had a new after market water pump installed.
Replaced water pump.
Needed catyltic convertor, new tires and was losing oil
Car was losing 2 quarts oil between regular maintenance (5,000 miles) PCV valve was replaced. Have not yet taken car back to dealer for oil consumption test. Update: problem persists.
Check engine light came on. Service dept. put it on the computer and 2 codes came up, 1. was the catalytic converter and 2: was a problem possibly with the gas cap. No definitive fix was given but an $1800.00 price was given for the repa.
Replace catalytic converter.
Replace hybrid cooling system
Resonator pipe broke from catalytic converter
running a little rough at idle
Exhaust heat shield rusted and needed to be replaced
Running exceedingly rough. Had to replace spark plugs & other electronic parts. Wanted to replace brakes, but decided not to at this time.
Engine was using oil, about a quart every two weeks, and had to be replaced with a used engine.
noticed the battery was not reaching full charge ... diagnostic was OK .. it was the heat .. we have a heat waze ( over 40) so the battery efficiency is reduced and will not charge as fully. Noticed improvments with cooler weather now.
I had a thermostat changed as I suspected it was sticking (via ScanGauge II water temp readings). Dealer software could not i.d. any trouble and was not recommending a change. I insisted and the new thermostat has cleared up the symptoms
Leaking water pump replaced under extended warranty
water pump leaking coolant, replaced water pump and belt...
Notice a slight misfire when coming to a stop. WAs not reproducible at shop and no codes stored in current flow but cylinder misfire was in history. Throttle cleaned.
Catalytic Converter Failed at 77,400 mi. Normal Car warranty expired however dealer replaced at no cost with a new one using the federal emissions warranty which covers this repair for vehicles under 80,000 mi
Water Pump leaking - replaced water pump
Replace drive belt.
Leaking main engine water pump
Cruise control was activated at 65mph on a rainy day on the highway and a car cut me off. I braked to override the cruise control. Instead of disengaging, the car sped up. I piled on top of the brake and changed lanes. Called Toyota and they blew me off.
Leak in water pump discovered during routine maintenance. Replacement covered by warranty.
Water pump needed replacing
3 Way coolant valve needed to be replaced. Was under warranty.
Engine check light came on. Took vehicle to local dealer who determined via the code that there was a misfire problem. Cleared Engine Check light. Suggested we had picked up water in gas. Added 150ml TSP water eliminator. No further problem.
Water pump leak at the housing. Replaced pump, gaskets and coolant Replaced accessory drive belt that was worn and frayed.
Oil change, engine and cabin air filters replaced, radiator cap replaced due to signs of leakage
Replaced leaking water pump.
Lag in response, cleaned dirty throttle body.
Replaced engine coolant pump
Water pump also identified as needing replacement on this trip.
P1121 code - known frequent problem with Priuses of this vintage; eventually got manufacturer to pay for full replacement of coolant flow control valve!
Carbon buildup on engine intake has to be cleaned.
Failed catalytic converter had to be replaced.
Kept getting red emergency triangle light in dashboard and " problem " across screen of brain unit before brain unit stopped working. After brain unit was replaced warning idiot light conditions still lit up intermittent. Found low oil.
Have had an intermittent check engine light for the past year. Dealer could never find anything. I eventually found it was very low on oil. Seems to be burning it. Not happy that dealer didn't discover the problem one of the times I took it in.
Engine Air Flow Sensor Failed - Check Engine - Computer kept shutting down engine - Had to tow to not wear down hybrid battery
Coolant flow sensor for inverter - replaced sensor and valve
Inverter coolant pump failed and was replaced
Hybrid Coolant Pump Failure
Cleaned throttle body and air filter.
Added dry gas to fuel tank
Odd symptoms intermittent, happened only twice with my wife driving - engine revs up when removing foot for accelerator at 55 mph to slow down for stop light. Service Advisor recommended Injector Flush & Induction Service 79.95 each. Not fixed.
Engine water pump and hybrid water pump and battery
Had to replace the "inverter cooling pump" (?). Was explained this part controls cooling for both the regular and hybrid engines. Check engine light came on then dealer attached a computer to find the code.
water pump leak
hybrid battery was replaced under warrenty
Hybrid battery failure. Trouble code P0A80 This is the one all Prius owners fear. However, I ordered a couple battery modules from Ebay and did the repair myself. That was 24 days ago and it is still running smooth.
P0420 code, perhaps because it is burning 500-700 ml per 1000 miles
Replaced catalytic converter to clear p0420 code. Fuel economy and power are back and engine light is gone!
Clunking noise from front. Service manager found a service bulletin about the issue. He ordered motor mount. I went back in a bout a week and they installed the motor mount, 3 hours.
Hybrid water pump needed to be replaced.
Engine water pump failed, got replaced with genuine part, repaired by a certified independent mechanic.
water pump cracked, needed replaced
Mass airflow sensor showed error code, part replaced.
serpentine belt, pulley replaced
Cylinder 2 was misfiring occasionally at idle. I determined the problem was fueling rather than ignition and replaced injector.
Coolant control valve Drive belt replacement recommended by dealer
Replaced leaking water pump (W/coolant) and drive belt.
Hybrid Traction Battery replaced. Received P0A80 error on Tuesday, Aug. 13, 2013. Drove to Poway Toyota. Battery replaced under warranty (150k mi)
Failed relay from high voltage battery
The pump for the inverter needed replacing.
Leaking engine water pump replaced under extended warranty while performing 135000 km service.
Bent valve rod. Dealer recommends replacing vehicle. A new engine is recommended. Repairs not economically feasible.
Original engine died at 254500. Replaced engine with used engine (52000 miles). Replaced entire exhaust system at the same time.
Water pump leaking and heater hose leaking. Replaced both.
Engine light on. Water temp sensor bad.
hybrid battery replaced under warranty
Power inverter coolant pump valve
needed new water pump
Main drive battery went out, but still had 12,000 miles of warranty left so it was free of charge. Wait time was due to the main drive battery was on back order.
Replaced worn serpentine belt.
Replaced leaking water pump
Replaced cracking drive belt. Pretty good I think to have gotten 100k on original one!
Water pump leaking; replaced
Water pump leaking - replaced on extended warranty
Dash light indicating need to take car in for service. Service indicated the cooling pump needed replacement and water pump had leak and should be repaired. Had both repaired.
replace manual water pump, evaluate transmission problem (none found). Drain and refill invertor coolant. Replace cabin air filter.
Replaced hybrid battery
Involved coolant control valve which had to be replaced
Radiator replacement with new coolant. Radiator developed pin-holes and was leaking Water pump replaced - leaking from shaft
Heat shields on exhaust system became loose causing a very annoying clanking noise when motor was running. New bolts were used to tighten heat shields. No more noise.
Water pump on IC engine was leaking and needed to be replaced.
Problem with hybrid battery. I was told 3 out of 20 cells degraded, and the battery needs replacement. I am disappointed with 1 year Toyota warranty for hybrid battery. 12V auxillary battery has 7 years limited warranty at the same time.
Replaced hybrid battery due to premature failure.
Said I needed water pump although I have never lost any coolant.
Replaced gas engine water pump and coolant control valve. Cell in hybrid battery failed at 93000 miles. Dealer replaced the hybrid battery assembly under warranty.
Possible small leak in water pump discovered during oil change. Warranty fully covered repair.
HV Battery (High Voltage) replaced due to one block with one volt low. Toyota process required multiple trips to the dealer over a few weeks while driving with the check engine light on to confirm and repair the battery pack failure.
The hybrid battery went out. We bought another one from Napa and installed it ourselves.
Engine light came on, faulty catalytic converter repaired and covered under original emissions warranty.
Hybrid water pump replaced under TSB. Check Engine light on, and high engine temperature was noted. Engine could have overheated withput proper repair. Air bubble at h20 pump caused lack of coolent circulation.
Northridge Toyota claims coolant pump is making a funny noise after vehicle shutdown. Independent research confirms this is normal for the Prius. Decided to get a second opinion at a different dealer with next service. I don't trust Northridge Toyota.
Had coolant pump that Northridge Toyota said was a problem checked out at North Hollywood Toyota. They could not identify any issues - as I had expected.
Was told hybrid system water pump was leaking. They replaced it but it started making sloshing noises immediately upon driving out of the dealership so took it back and they bled the system (again supposedly) which fixed .
found internal combustion engine pump was leaking, replaced both pumps.
Defective sensor. Leaking water pump. Install sensor. Install water pump.
Battery died out due to low voltage problem, (multiple codes in system). Dealer called Southeast Toyota (SET) who advised Dealer to replace Inverter Assembly. After replacement, problem was solved.
Noisy electric cooling pump replaced under warranty. TSB exists and was ordered done.
Oil pan replaced by dealer who sold the car to me at their cost as part of car sale.
Coolant control valve stuck
Codes p1121and p1116 set check engine light, and failed smog test. ONLY because I had a documented smog test failure, this was covered under the prius 15 year, 150,000 mile warranty. It was a sticking coolant control valve.
Traction pack failure. Requires replacement or repair of traction pack. I will be doing the repair at a later date. Vehicle is sitting in the driveway for now while I wait to order parts.
Was burning oil; about 1 qt/350 miles. Replaced engine.
Hole in exhaust, at a spot difficult to get to. Attempted to seal, repair failed after one week. Now living with a noisy Prius.
Car refuses to run more than ~10 seconds. Multiple error codes suggesting issue with throttle control. Have attempted to take apart throttle control, difficult and complex to diagnose. Car is currently broken awaiting more of my free time
The water pump that operates after the car is turned off to pump coolant into an insulated tank had a bad bearing. Common failure, apparently. About 4 hours of labor, but under warranty.
Coolant pump sounding noisy. Replaced pump under warranty.
Working on the brakes to sand glaze off of the pads and rotors (showed almost no use after 60K miles), I spun the wheels off ground. The computer went nuts and gave all the brake warning lights. Dealer was kind and reset the computer for $60.
Car died. Towed to dealer. They said originally battery defective under warranty plus bad fusible link. Later said inverter bad therefore nothing covered under warranty. Want $5500 plus tax to repair. Asked why no warranty. Answer nothing defective.
Car died. Battery determined defective. Also found a fuse and inverter bad. Only battery and tow covered under warranty. Owner paid the rest.
Unusual engine oil consumption in the past several months. Engine sludge was suspect and engine was flushed with special detergent. The oil consumption drastically reduced after this engine flush.
Replaced hybrid battery with a reconditioned one.
Electric motor in Hybrid system seems weak. Less resistance than when new, lower gas mileage than when new.
Computer died this time battery car would not shut off transmission kept shifting in neutral while driving all dash lights came on car would not start or shift water pump leaking replaced battery had no brakes!
CEL came on, Toyota replaced a sensor under extended warranty (some sensor related to the cooling system).
Replaced traction battery at 106,000 miles, in March. Used rebuilt battery. I had a surging when first started for the first 5-10 minutes when parked in the direct sun, in very hot weather for 4 years. Trouble code 3-14. New battery eliminated problem.
Inverter pump was starting to make a lot of noise at shut down. While my car was being serviced for the recall, I mentioned the problem to the dealership, and there was a tsb out on the problem. They replaced the pump quickly and well.
Coolant Water Pump was replaced as it was weaping coolant.
Needed new H20 pump.
Engine water pump was leaking. Had it replaced.
Dealer reported leak @ water pump while trouble shooting an open circuit in air bag system. Decided to have local Goodyear dealer install. Do not trust, repeat - do not trust Toyota dealer where we purchased our Prius.
Noisy thermos water pump.
Replace muffler - can rusted through, no longer attached to pipe towards resonator.
Slow coolant weeping from internal combustion engine water pump, replaced with OEM (Aisin) part from Amazon plus a gallon of Valvoline Asian Car 50/50 coolant.
CEL on w/ many codes-most caused by aftermarket installation. Xtra time taken for repair to isolate & repair real problem-dirty sensor.
Slow (at the time of repair) coolant leak at the water pump. Water pump replaced under warranty and the leak was fixed.
Coolant transfer pump made high pitched whine on start-up and shut-down, especially in cold weather. Pump replaced under warranty.
Weeping engine coolant pump replaced.
Replaced HV battery due to reduced battery capacity resulting in poor climbing performance.
Hybrid inverter pump broke.
Hybrid battery failure
Water pump, $480
Inverter coolant pump replaced under powertrain TSB warranty
Hybrid battery failure. Rebuild a spare and replaced.
Leaking water pump was replaced by dealer. Requested new serpentine belt since old one had 88,250 on it and there would be no additional labor charge.
Water pump leakage identified during oil change and lube
Water pump was just starting to leak
Water pump replacement
Hybrid battery needed replacement. Dealer tried charging me 4400 even though two other dealers had lower quote. Dealer did not lower price until I actually sent a tow to tow it somewhere else! This is even after I talked to manager!
Water Pump was leaking identified on previous periodic maintenance check. REplaced pump and belt
Replaced the engine coolant control valve sensor and coolant.
The main hybrid battery failed. Replaced under 150k warranty.
Replace leaking water pump
Mechanic found that the water pump was leaking and replaced it on warrantee.
vehicle lost power on hwy 680
nothing was done by toyota to fix this
Broken rod in engine, presumably due to wear. Entire engine was replaced with used engine (68K) as it was much more expensive to rebuild.
Hybrid battery defective. Battery was on back order and took over 6 weeks to arrive at dealership
Inverter pump failed.
Water pump was leaking
Hybrid battery pac needed to be replaced
Replaced idler pulley.
Hybrid battery failed.
Serpentine belt replacement. Made noise, dealer said it was fraying.
I took my car to Toyota and they pulled a P3110 "IGCT Relay Malfunction" and a B2799 "Immobilizer Malfunction" code. They reset, checked and cleared everything and the error hadn't occurred since. Cost me $90.
Leaking engine water pump (not the inverter).Replaced along with new V belt
Three way valve in coolant system was stuck. Also, water pump had minor leak. Both were replaced
Hybrid traction battery failure
Inverter coolant pump faulty per Toyota TSB/recall. Throwing up error messages on the dashboard and about to fail completely. Parts replaced under warranty.
Water pump leaking coolant, discovered while replacing serpentine belt. Pump replaced.
Traction battery failing. Red triangle and check engine illuminated, could not accelerate to high speeds.
Hybrid battery replaced.
water pump seepage fix and recall work related to acceleration fix (shortening the pedal)
Replaced high voltage hybrid battery.
Replaced spark plugs at 65,000 miles. One was found to be defective.
Still a problem. Weird pattern of warning lights including at times the CEL Car still runs just fine but there is a question as to what systems are working correctly. Will report more as this story unfolds.
Car suddenly started to misfire. Check engine light flashed at first then became steady. No problems previously at all. Turned out to be worn spark plugs. I have never known plugs to fail suddenly.
Clean Throttle Plate Replace Water Pump Replace Belts
Prius stopped running, but limped to dealership. Main battery and several other items replaced. Cost not disclosed.
To diagnose low gas mileage; reported to be result of higher ethanol levels & not a problem with car; skeptical.
belt replacement required
While in for Oil, Filter, and wheel alignment the technician discovered that the water pump was leaking which also affected several belts. The water pump and belts were replaced under warranty.
water pump was leaking causing a loss of coolant. Car was flatbed towed to dealer for repair.
Tire press. light came on while driving, stopped and put air in and tried to reset but the light did not go off. More user error- I didn't hold the set button down long enough and they put in a little more air.
water pump seal was leaking and was replaced
Cracked radiator, leaking water. Water pump, etc repaired/replaced.
I went in for 30k maintenance and also for squeaky coolant pump under TSB 0087-08, and also a squeaky rear window. They could not replicate either of my problems, and nothing was fixed. I was very disappointed and angry with them for not fixing anything
squealing noise coming from coolant pump. replaced under TSB 0087-08
Two cells of the HV battery were not working and all dash lights came on quite unexpectedly. Diagnosis by dealer confirmed HV battery needed to be replaced. Dealer replaced the HV battery and two cables. Toyota covered 70%; I paid 30%.
Hybrid battery failed and was replaced under warranty
Hybrid battery failed and needs to be replaced. Will trade car instead.
The inverter water pump was replaced. I have listed this under "electrical repair" because I understand that this pump cools the AC to DC mechanism.
The triangular warning light was coming on intermittrntly. At the last lube and oil, it needed oil, for the first time ever. The PCV valve was replaced, no additional oil was needed at the most recent l&o and the light has not come on since
Replace cat converter...what a drag and big bucks!!!
replaced water pump
Driving and car died. Towed home and researched on internet that electric inverter coolant pump for hybrid engine was the cause. Replaced fuse and pump and car was good. Got recall 1 month later and sent Toyota my receipts and refunded $.
Replace water pump (I think it was leaking). done under warranty !!
Coolant transfer pump was squeaking in cooler temperatures, replaced under warranty.
Replaced leaking water pump and replaced engine coolant
flush fuel injectors;replace 2 front tires; alignment; oil change; replace air cleaner and cabin filters; spark plugs
Coolant flow control valve replaced
Hybrid battery needed replacement.
Water pump (for ICE) needed replacement
One of the cells in the rebuilt hybrid battery failed. A replacement cell cost only about $40. However,the labor to remove the bad cell and replace it, cost about $560.
Two of the four coil packs failed and required replacement of all four spark plugs + two coil packs. The car was out of service for two days.
Grinding type noise noted when gas engine engaged.
One of the 28 cells in the hybrid HV battery went bad I bought a new one for $37.50 on Ebay and did the repairs myself. Fairly easy fix.
Traded car with broken transmission coolant pump drive. Dealer performed repair after trade.
Engine water pump had a slight leak, so it was replaced along with the thermostat (preventative).
Hybrid battery pack issue
Engine water pump weeping coolant- was replaced.
Mysterious rattle/clunk in front end when going slowly over washboard road or RR track. Shop proposed an engine mount TSB that is a) not important, and b) $400, so I'm ignoring it for now. Also, I don't think it's an engine mount problem.
Replaced inverter water pump. Also recall C0T - Steering shaft.
Dealer replaced one of the two water pumps on a recall and said the other was leaking, and not covered, so we took it to our regular mechanic and he replaced the second pump.
Replaced Engine Seal. HV Water Pump Recall. Replaced Leaking Water Pump and cracked Belt.
hybrid system inverter pump was replaced under campaign warranty.
waterpump leaking coolant / pump and gasket replaced warning light was on / system failed test. Catalytic converter replaced.
Hybrid battery fail / replaced with used battery with 1 year warranty. part $1387.50 and labor $212.50
radiator failed / replaced with used part $200.00 labor $157.50
Dealer said car was due for drive belt replacement, likely original, over 110,000 miles at that point.
The hybrid traction battery failed. Initial estimate to repair was $5300. I called Toyota and a different dealer who was honest about the battery core charge, etc.. Toyota kicked in about $1950 towards the repair.
Coolant control valve failed. Part of Emissions system. Required replacement to pass State Inspection. Code P1121.
hybrid main battery failure
Valve in hybrid cooling system triggered P1121 CEL. Replaced by dealer at same time hybrid cooling pump recall service done for additional charge.
Water pump for gas engine was leaking.
The coolant valve was stuck and had to be replaced.
hybrid battery needed to be replaced. Toyota has extended battery warranty to 150k miles.
Electric coolant recovery pump was making noise so I replaced it.
Second oxygen sensor caused error P0138 the MIL turned on.
Engine doesn't run; can drive a few more miles on the battery. Throws codes 3190, 3191, and 3193. CEL and large triangle with ! inside lights up on dash. After sitting 30-40 minutes, car drives normally again.
P3190 and P3191. Replaced fuel tank assembly (includes fuel pump).
Got the red triangle of doom. ECU gave an HV battery code. Checked and one pair (block) was 1V low. Bought used pair for 80 and swapped them in. Going slow repair is 5+ hours, going fast it can be done in under 3.
Mass airflow sensor needed to be cleaned or replaced
Exhaust needed replacement
a piece of the exhaust pipe was replaced.
Replaced hybrid battery pack under warranty
water pump and belt replaced
Check Engine light went on. Oxygen sensor was replaced. Check Engine light went off.
Warranty/Service Campaign replacement of the inverter electric cooling pump.
inverter water pump failed.
Pipe separated from flange due to corrosion/wear. Repaired by welding.
thermostat for hybrid cooling system replaced
Inverter for the power brakes had to be replaced.
Gasoline engine water pump noisy. Replaced the water pump
Water pump and V belt replaced
The check engine light came on and local Toyota dealer quoted $450 to $500. I ordered the coolant valve position sensor online for $80 and neighbor/friend installed for $100.00--all better now!
Replaced serpentine belt.
Inverter water pump failed and had to be replaced - although car is out of warranty, manufacturer paid for all but $130 of repair cost and provided free loaner vehicle
Hybrid battery failure
HV Battery at 40%. Deep cycled 3x.
Rusted exhaust pipe replaced
water pump leak, caught by mechanic during routine service for oil change, etc. Water pump replaced under warranty (2 weeks before end of 5 year warranty).
Oxygen sensor in exhaust required replacement. The error message recurred twenty minutes after leaving the garage. When re-examined the garage thinks it is due to using a non-standard catalytic converter. Too expensive for minor benefit.
Leaking water pump required replacement
VSC and Regenerative Braking warning lights on.
Hybrid battery low charge only abnormality found by workshop.
Recharging hybrid battery cured warning lights.
Coolant Diverter Valve replaced.
Engine Water pump replaced
Began losing coolant. one dealer diagnosed as faulty replacement ICE water pump and replaced at no charge (They had already replaced pump 8 months earlier. Coolant loss continued so I took it to another dealer who diagnosed faulty rad cap. Second dealer diagnosed and replaced faulty rad cap. Cost $130, No problem since.
Continued coolant loss eventually diagnosed as cracked engine block. Replaced the gasoline engine.
The engine coolant valve needed replacement and was replaced under warranty.
Some kind of water pump was leaking. Had to do with the engine. Also had 2 recall items performed, which was how the issue was discovered.
Exhaust mangled by road hazard. Replaced exhaust pipe assy FP# 17410-21500 plus 2 gaskets.
Replaced all 4 tires
Hybrid inverter cooling pump failed. Dealer replaced (waited 1 week due to backorder) under Extn. Warr. Also request coolant storage pump replace (TSB-0087-08) due to loud squealing after shutoff. Dealer could not replicate/no repair
Dash warning lights on. Codes P0A60, P0A63, P0A72, P0A75, P0A7A, P0A78, P3212, P3222. Coolant leaking inside Inverter housing. Replaced Inverter. (Possible indication of MFD issues with that many codes?)
Check engine and dash warning lights on. Codes for Inverter cooling system, high voltage ECU, and ABS-TRAC system. Repaired frayed wire to Inverter cooling pump. (Possible packrat damage or more evidence of intermittent MFD problems?)
Check engine light on. Error code P043A. Replaced water pump assembly.
Engine began missing, running rough. MIL came on in 20 miles. Replaced spark plugs to correct. They had at least 68K miles on them, the amount I put on the vehicle.
warranty software upgrade possible recall
Technical service bulletin. Replaced fuel filler tube. Reprogrammed ECU.
Check engine light on. Fixed leak in fuel evaporation canister.
P1121 code, changed coolant valve and also replaced gas hose and gas cap also replaced gas hose and gas cap
Leakage from the dealer installed recall water pump required install of new pump.
Craig's List ad for main battery repair due to lower
charging over several months and unusual charge rates.
Check performed on all cells and two replaced. Solved
inconsistency noted in battery feedback and MPG improved to 49 from 44.
Had main battery checked and replaced three of 28 cells. Charging of battery had been rapid cycle indicating a problem which was resolved
water pump for electric motor failed
I.C. Engine water pump.Remove and replace.
Hybrid (traction) battery replaced with one from 2007 wreck with 67000 miles.
Inverter coolant pump failed. Dealer replaced the pump at no charge due to Toyota Limited Service Campaign for Inverter Coolant Pump.
Inverter coolant pump failed. Electric pump caused fuse to blow and system shutdown. Repaired in one day by dealer.
Had to replace cooling system for hybrid system. Inverter I believe they called it. Later recalled and reimbursed.
Engine Water Pump replaced (technician noticed leak, and I had read they should be replaced in the Prius at ~100K). Noticed during inspection.
HV battery failed at 194k miles. High RPM when accelerating. SOC fluctuated rapidly. MPG OK. Later the dashboard lit up - P0A80 code. ReInVolt (NC) supplied a refurbished battery for $1600 to my Dealer (CT) who installed it for $400.
Rear Muffler - Hole in exhaust pipe
Water pump leaking. Water pump was previously repaired under recall.
Replace faulty inverter coolant pump for main battery recharge system. P0A93 computer code.
Water pump (main) was 'crusted over'.
Replaced inverter coolant pump
Water pump early stages of failure (noise, binding, leaking). Replaced water pump and engine coolant. Also replaced water pump belt, spark plugs, PCV, oil/filter, air filter, and rotated tires.
Hybrid Inverter Coolant Pump Failure (DTC P0A93). 2nd failure (first in June, 2008). Managed to limp home, then to dealer.
While the car was at the dealership for an oil change, we were told that the inverter coolant pump was noisy and needed replacing. The car was taken to an indy shop, who said that there was no problem with the inverter coolant pump.
Water pump changed after replacing the serpentine belt. The dealer suggested the replacement of the ICE water pump after seeing light coolant leak. The change was done under warranty. The dealer did the replacement on my second Prius too.
Many warning light Coolant pump failure.
Repaired in June. Car died on road. Wichita Toyota dealership replaced a fuse to repair,charged $240 service advisor lied as to which fuse I later found out. Replaced faulty cooling pump myself.
Check engine code P0138 post-catalytic converter O2 sensor. Part ordered.
Dealer replaced O2 sensor, but check engine light still came on. I then purchased a ScanGauge for $170 to clear and diagnose the problem.
Check Engine light P0031 fixed by replacing air-fuel ratio sensor. I purchased the replacement sensor over the Internet since dealer price was high.
Replaced oxygen and air/fuel sensors to clear check engine light. Also replaced a leaking exhaust gasket. Dealer also replaced inverter cooling pump at no cost (recall). Replaced brake fluid (maintenance item).
Replaced stainless steel muffler since it had developed a hole.
Inverter Water Pump. Car not driveable. Parts had to be ordered. Took 2 days for parts to arrive and 1 day to install.
Gas engine water pump was considered leaking by the dealer. Not noticed by owner.
Water pump and thermostat had to be replaced
The traction battery went bad. I got a new battery from a 2007 Prius with 26k miles from a junk yard. The battery was 400 and Toyota gave me 150 back for the old battery. I will also sell the battery ECU for maybe 50.
Inverter pump failed, replaced under extended warranty.
Water pump (the one for the ICE engine) preventive replacement, sign of light leaks, changed under warranty.
One ignition coil was full of water. When the engine was warm (lean combustion) engine was knocking very hard, misfire on cylinder #1. The ignition coil has been replaced (95$ part + 1 hour work) and the problem has been solved.
Inverter Pump...ordered but not yet replaced|car is in shop now. Also(after being told the car was safe to drive until part came in) 12V battery failed on interstate|lost all power and car automatically shifted into neutral|had car towed
Fuel injection system needed to be adjusted and cleaned.
Water pump was leaking - needed to be replaced.
Ice was making more noise than usual, mentioned it when getting scheduled oil change, mechanic said bearings were going out on the water pump, replaced the belt as well. Purrs like a kitten now.
Replace water pump for gas engine
Inverter coolant pump failed, Inverter temps got too high and CEL lit. Care did not operate at full power, lost AC. Had Recall notice in car but hadn't had it performed prior to event. Repaired at no cost.
Replaced one of the coils
Leaking water pump Leaking radiator
Water pump was replaced.
Replace Hybrid Battery Pack
Inverter cooling control valve replacement (check engine light came on)
Original water pump was leaking, so replaced water pump.
One of the water pumps (not under warranty) failed. This resulting in an overheating warning popping up on the car screen. Water pump was replaced.
Pinging during half throttle going up hills. Throttle body and intake had carbon that may have been affecting fuel mixture. Components cleaned.
Low engine power DTC, caused by a loose battery ground connection. Faulty ground caused engine to run rich, damaged the catalytic converter. Still need to be addressed.
Problem was with hybrid battery and systems. Original warranty covered repair. Also replaced water pump (owner expense).
Check engine light. Code 3130. Need new inverter coolant pump. Mechanic says radiator leaks. Cost estimate $1000.
Main hybrid battery gone bad. Too expensive to replace relative to value of car. Disposed of car
Belt on water pump cracked.
Replaced inverter cooling pump
This car was not running right when i purchased and it's not running at all now. I removed the HV Battery and ordered a rebuilt one.
Water pump bearing had been noisy for a couple months. I replaced it.
HCAC bypass valve stuck. Toyota has to replace entire exhaust and catalytic converter because of one small part that rusts shut.
ECU replaced under warranty.
codes: p0440 p0441 p0446 p0300 p0202 p0504. Diagnosed faulty coolant pump. Replaced. Bled.
Unknown at to why they did not get this covered under hybrid systems warranty.
Engine was missing and running rough. Worse on wet days and when engine was warm. Problem was intermittent. Codes were random misfire on most cylinders. Codes P0300 P0302 P0303 P0304. It turned out to be one bad ignitor. One bolt to replace.
electric pump in cooling system of hybrid/electrical drive system failed. Had to chase the problem, then take front bumper off and left headlight out, to replace this 'coolant pump'.
I think this was the gas tank problem (warranty repair). Error code: TSB 0-180-09. Corrected by EG9016.
Cell 6 of HV battery is weak. Lots of conflicting advice from mechanics and Prius owners who have dealt with this problem. Can drive for a year or a day.
bad sensor on the catalytic converter. Covered under warranty
MG1 hybrid electric traction motor failed.
Replaced the oxygen sensors. Heater for one seems to be bad.
Replace charcoal canister (warranty)
Replace ECM (warranty)
Replace Crankshaft Position Sensor (warranty), replace weatherstripping in trunk
Replace Hybrid Battery - 50/50 split of cost with dealer
Catalytic converter replacement
Power inverter coolant pump failed; told had to replace both pump and inverter. Requested dealer repair comp parts, since car only a couple of months out of warranty; they refused. When the car was returned the AC did not work, 2nd repair
HV battery failed and replaced
P1436 code check engine light. Lubed and freed catalytic converter warmup valve. Sticks from road grime.
exhaust gas leak. Attempted replacing both donut gaskets to no avail. trying other things next.
Plug for catalytic warm up valve broken wire
HV battery replacement. Replacement battery was a re manufactured battery from ReInvolt.
inverter cooling pump failure.
Replace inverter coolant pump
Hybrid Battery needed rebuild
Hole in the radiator; had to replace radiator.
The dealer cleaned the Mass Air Sensor to cure a stall-at-start-up problem that I used a work-around for 5 years to avoid (I shifted into Neutral after start-up and waited to hear a relay click before shifting into Drive).
Fuel pump failed - had to replace both pump and fuel tank as they are one unit in this Prius. This vehicle is a piece of s---.
Inverter electric water pump replaced,none in USA per dealer had to use rental for week.
engine shuddered on start up. Replaced plugs because computer readout said misfire #2. Swapped coils around to verify not coil. Mechanic said valve cover gasket leak might be cause will cost $150 to replace. Then will have to do cmptr ck agn
Warning lights are on. As of late July still haven't taken it to the dealer. Shudder, gasket leak still present as well.
I found Greentec auto online and ordered a replacement 1st gen battery pack. They came down from Dallas and removed/installed battery pack behind back seat.The total bill was for labor, material and sales tax.
I had a couple of warning lights come on that the manual said tow to dealer. I trailered it myself, it ran but I didn't know how long it would.They did a diagnostic test and said the battery pack was defective. Greentec auto called me and had me do some simple diagnostic tests involving the warning lights. They agreed the battery pack was defective and sent a tech with replacement battery pack.
inverter pump quit, replaced
Car entered limp mode, with only electric motors working (gasoline engine would not start). After a tow to the dealer, the car was diagnosed with a catalytic converter failure, which was replaced.
Car drove normally, except for a loud whine and a shudder when starting from a complete stop. OBD2 scanner showed excessive MG2 temperatures, so the shop replaced the motor assembly.
(Repair cost is approximate)
main computer at 16,000 miles (very cold -25 degrees) replaced no problem. warranty
No other problems / repairs
sensor, communication between motor and hybrid system
MG2 stator burnt, replaced.
Car displayed CEL with other warning lights and would not start after 12V battery went flat and was recharged. Workshop cleared codes and car started and ran without further issues.
Malfunction of engine/drive system.. Car stalled out a few times, dealer could not repeat and no repair was done... Has not reoccurred but does show up at least once a year.
Inverter water pump failure.
replaced transmission with a donor (junk-yard)
Failed emissions test for ongoing problem with ECM that causes the cel to come on in cold temperatures. Initially diagnosed in December 2007, but the repair was expensive and only intermittent, so I held off. After I called for appointment for previously listed problem, CEL came on and stayed on despite warmer temps. Mechanic notes: FOUND 3 DIFFERENT CODES STORED IN THE ECM, ECM CODE, CODE P0171 FOR A MASS AIR FLOW SENSOR, ALSO FOUND A 300 MISFIRE Replaced ECM. They reviewed my service history and agreed to cover cost given I'd had almost all maintenance done @ a dealership.
Replaced Air Flow Sensor, $253
P0302 - Cylinder 2 Misfire Detected Since spark plugs had been done one year ago, that was not suspected as the problem. May have been a loose gas cap. Code reset, will see if comes back on.
Big (270 volt) battery replaced.
Water pump replaced that cools electric motor.
Fan belt needed to be replaced. New air filter.
Cat Converter sensors indicated failure. Mechanic advised me to put tape over the indicator light and keep driving. Will not effect operation or mileage.
Drive battery bit the dust. Failure warning. Cost to repair is $3,500+. Car is being sold for scrap.
Replaced gas pedal assembly/ throttle position potentiometer defective and caused engine to stall/shut down / dealer price was $425.00. I purchased pedal from 25k mile salvage Prius for $45.00 off eBay+ $5 shipping.
Drive battery replacement
Check engine light on signaling fault in fuel tank vapor recovery system. Dealer diagnosed as the filler cap or the vapor cannister. Suggested replacing the cap but didn't have one in stock.
Car recorded an error code for fuel tank vapor recovery. Hose clamps on vacuum lines had rusted, allowing a vacuum leak at fittings. I replaced clamps and the code has not returned.
Car would not start (no "READY" light, and all error lights on). Mechanic traced to engine computer not communicating with hybrid computer. I declined repair due to the cost. I am not operating the car now even though it runs and drives.
HV (hybrid) battery had a bad module, required replacing and new harnesses.
Car had check engine and major warning lights come on. I coasted it to a stop, had it towed it to auto mechanic. DTCs included for Aux battery, transaxle, inverter. DTCs localized to MG2 (= the larger of 2 electric motor/generators in HV transaxle assembly). Said to replace full Transaxle for $5,400. Luscious Garage in SF does MG2 replacements for $2,700. But I'd need to get car towed to SF.
Replaced MG2, the motor generator.
replace main battery with refurbished. also replace serpentine belt, cracked, cooling system flush / inverter, drain and fill transmission fluid. car owner paid FULL cost of repair.
Had to clean the Mass Air Sensor and the intake. The motive battery charge was very low which caused the dire warnings and did not let the engine to keep running.
Mass Air Flow sensor
broken exhaust pipe; repair caused rattle fixed by dealer
Received a reconditioned "main" battery pack, from Green Tec up in Sacramento, CA. Pack was installed at my home, and old battery pack went to them. $1700 plus $350 for installation.
traction battery (the big one) tested bad, with two cells failing. Throwing codes and red triangle warning icons. Installed refurbished battery
catalytic converter needed to be replaced, since Calif. will be requiring smog checks sometime in 2015
CC giving P0420 error. Apparently a known issue. $1500 to repair just for parts. Living with it.
I got the triangle w/!, the car continued to function, I took it directly to my local shop, Ozzie's. Diagnosed (from the code) that the ignition coil was bad and needed to be replaced. They also replaced the spark plugs (1st time in yrs)
check engine light came on, it turns out it was just the gas tank cap. I had driven to the desert and back the day before and probably the change in altitude going over the mountains affected it. It was on empty when the light came on.
Getting a leak to ground fault. I had the problem diagnosed at a non-dealer shop, and took it to the dealer to get additional diagnosis. After spending $100. dealer gave me only the code I already had! Dealer did not provide subcodes. Replaced MG2 rotor. Replaced main battery
HV Battery replacement. Replaced with battery from re-involt.
Was told hybrid battery bad, would cost an additional 1675 (above 998 for brakes) told them to wait on battery, no $ for that now.
Got triangle warning/check engine lights. Dealer said it was engine startup/misfiring problem in the fuel injection system and they would have to replace gas tank, clean the (something)plate, replace the spark plugs, etc.