| 1 | 0 | 3 | 4 | 3 | 4 |
Hummer H3 repairs by problem area
Engine (33%)
Transmission and Drivetrain (16%)
Brakes and Traction Control (4%)
Suspension and Steering (12%)
Electrical and Air Conditioning (21%)
Paint, Rust, Leaks, Rattles, and Trim (10%)
Other (3%)
Chart based on 275 repairs.
Hummer H3 engine repair cost distribution
$2500+ (11%)
$1000 - $2499 (9%)
$500 - $999 (9%)
$100 - $499 (26%)
< $100 (45%)
Chart based on 80 repair trips. The repair cost chart excludes repairs made under warranty, do-it-yourself repairs, and repair trips that include maintenance.
2008 Hummer H3
Engine not specified
| 62620 mi C $460 |
Check engine light stays on. |
2008 Hummer H3 4dr SUV
295-horsepower 5.3L V8 4-speed automatic AWD w/low range
| 142100 mi US $7500 |
#5 bearing spun. Full engine replacement. |
| 47000 mi | Total engine failure, 5.3L V8 |
| 93700 mi | Oil Pan Gasket needed replacing, oil leak Replaced cat back exhaust |
| 90800 mi US $15 |
small coolant leak |
| 120000 mi US $25 |
Simple preventative maintenance- Oil Change, air filter cleaning (k&N) and MAF and throttle body cleaning (rough idle) |
| 149000 mi US $250 |
Heat shield on catalytic converter came loose (rusted weld), put exhaust strap on it. |
| 150000 mi US $1250 |
Replaced cracked radiator |
| 176000 mi US $1600 |
The vehicle went in for broken exhaust manifold bolts and an exhaust leak. I decided to replace both exhaust manifolds due to the age of the car but technically they were not required. |
| 176000 mi US $8500 |
I had a lifter freeze and destroy the cam lobe. The noise was hidden by the exhaust leak and became very apparent when exhaust was fixed. I could have replaced the lifter and cam but chose to replace the motor due to high mileage and metal particles in the oil. The cost of the motor replacement would have been $7k but I chose to replace all hoses, alternator, water pump, thermostat, fan clutch , plugs, coils, etc. If I had just done the lifter and cam the cost woudl have stayed around $1k |
| 65000 mi US $1750 |
Top of radiator leaking because of no padding on upper retaining bracket. Original OEM design and install. DTC P0121. tech found the throttle body bad. |
2008 Hummer H3 4dr SUV
242-horsepower 3.7L I5 5-speed manual AWD w/low range
| 105000 mi US $1 |
Radiator needed to be replaced |
2008 Hummer H3 4dr SUV
242-horsepower 3.7L I5 4-speed automatic AWD w/low range
| 45000 mi US $170 |
Engine service light replace Gas Cap.1st. according to repair manual. Then had to replace Gas tank Pressure valve at gas tank. |
| 54000 mi US $30 |
Muffler Heat shield clamp broke & had to be replaced. |
| 77000 mi | Occasional engine loss of power under high steering load when just starting up after about a week of sitting. |
| 54000 mi US $748 |
Radiator cracked at top causing leak. Vehicle also has a rough idle. Cause of Idle unknown |
| 103000 mi US $250 |
Engine started running warm on warmer days. Thermostat needed to be replaced. |
2007 Hummer H3 4dr SUV
242-horsepower 3.7L I5 5-speed manual AWD w/low range
| 118000 mi US $55 |
Water Pump leaking (bearing) |
| 67000 mi US $2600 |
Cylinder number 5 misfiring, valves stuck. Entire block needed rebuilt. This is a common problem with this engine and GM is ignoring. |
| 82000 mi US $300 |
Servo valve in sensor showed engine light, design change made a $100 part cost $200 with $100 installation. |
| 95000 mi US $807 |
Radiator needed to be replaced as well as a u joint. |
2007 Hummer H3 4dr SUV
242-horsepower 3.7L I5 4-speed automatic AWD w/low range
| 68000 mi US $50 |
Engine Light On; vehicle running sluggish |
| 86000 mi US $3899 |
catalytic converter bracket broken. Bolts broken off in head. replaced head and catalytic converter because bracket and converter are one piece. |
| 97600 mi US $9000 |
replaced radiator replaced engine, $6000 |
| 48200 mi | Catalytic converter was replaced. |
| 60000 mi US $240 |
Can position sencor. |
| 109000 mi US $417 |
Water pump replacing. No power on acceleration. Sluggish. Still dealing with it. |
| 109000 mi US $777 |
Loud rattling. Replaced motor mounts and transmission mount. |
| 69500 mi | Radiator went bad, and the Hummer dealer replaced it and flushed the cooling system for free.. Wright Hummer in Wexford PA is the best dealer I have seen that takes customer service serious.. They are #1. |
| 82000 mi US $600 |
Overheating replaced radiator. |
| 36300 mi | hard idle, replaced stock air intake with k/n air intake, also added g force power chip. idle now better, gas mileage up 6 to 7 m.p.g. |
| 44200 mi US $300 |
Pass lock system,replaced ignition tumbler. |
| 67500 mi US $600 |
Catastrophic water pump failure |
| 77000 mi US $100 |
Lower radiator hose and thermostat |
| 99200 mi C $300 |
Kept shutting down while driving, traction control failing, service stabilizers |
| 107840 mi C $850 |
broken water pump |
| 58200 mi US $1290 |
Water pump replacement |
| 67000 mi US $1200 |
Radiator split apart and had to be replaced |
| 39500 mi | Check engine light on. Small evap leak found. Smoke test. Dealer replaced vent solenoid and gas cap. Retested, no leaks found. |
| 112840 mi R 180 |
Thermostat replacement. |
| 58000 mi | Master cylinder failure - have to REPLACE Engine |
| 62000 mi US $2850 |
Complete cylinder head replacement. Top engine tear-down and reassembly. Due to engine misfire fault code and rough idle concerns. Poor acceleration after long haults at stop signals. |
| 85000 mi US $250 |
At 90000 miles Radiator's plastic top tank seams started leaking coolant and loss of cooling system pressure. |
| 92700 mi US $5000 |
Poor engine cylinder head design at manufacturer. Engine studder and misfire at idle while in gear with foot on brake.Replaced cylinder head w/ new and problem returned after appx. 4000 miles. |
| 92500 mi US $3000 |
Cylinder Head is bad. Needs to be completly replaced. |
2006 Hummer H3
Engine not specified
| 43000 mi | Started H3 and it shut down, would not start, called OnStar for diagnostic check, found ECM needed replaced as well as a new battery. Roll back picked it up and delivered to dealer. Did not cost me a dime. |
| 58000 mi | Coolant also leaking. |
| 53000 mi | Replace accelerator pedal sensor. |
2006 Hummer H3 4dr SUV
220-horsepower 3.5L I5 5-speed manual AWD w/low range
| 98000 mi US $7200 |
A Rod in the engine failed. The entire engine was replaced along with a new clutch. |
2006 Hummer H3 4dr SUV
220-horsepower 3.5L I5 4-speed automatic AWD w/low range
| 10000 mi | The engine light came on and had to be completly reset. The computer had blown a chip. |
| 10000 mi | Traction control problem ...they could not suplicate in the shop...Happened again today, Feb 10th, got code from onstar this time, will make another appointment |
| 10000 mi | Needed sensors replaced. |
| 95000 mi US $395 |
Ignition key could not be removed from ignition. Replaced two (2) sensors, did not correct problem. Disconnected brake switch. |
| 25000 mi | Engine blown- 80% leakdown in #3 cyl and significant leakdown in the remaining 4. Started with intermittant CEL's and progressed to very rough idle, power loss, and single digit fuel economy. |
| 14400 mi | ECM replaced. |
| 67000 mi US $70 |
EVAP canister failed and needed replacement... |
| 76200 mi US $30 |
02 sensor fail. |
| 86000 mi US $99 |
02 Sensor fail again... This was again related to DMV inspection failure. I have made several attempts to pass so far and waiting for codes to clear b4 police issue violations for overdue inspection dates. |
| 17980 mi | engine shuttered on initial start-up each morning. Dealer reflash of ECM. Shutter now gone |
| 35340 mi | Check engine light on, due to emission evaporation, vent sensor malfunction. |
| 35000 mi | Engine light. Took in. Code: P300. Did leak down test. Confirmed - #3 cylinder head has a 70% leak. Per TSB - replace cylinder head. Parts ordered. Will take 3 weeks to get. 15 other H3's ahead of me for replacement on head. |
| 37000 mi | Install Cylinder Head from February visit. |
| 68000 mi US $300 |
crack in top of radiator assembly. replaced the upper assembly at dealer. |
| 93000 mi | Replaced thermostat. |
| 99000 mi US $40 |
Error code P00014 timing error. Replaced crankshsft solenoid. |
| 47140 mi C $350 |
replace spark plug coil |
| 80000 mi | engine wouldn't start--fuel pump not pumping. I removed the circuit breaker and reinstalled---pump started pumping and no trouble since |
| 80000 mi | engine would turn over but not start--fuel pump not operating |
| 82000 mi | Needed Heads |
| 7200 mi | Cylinder head replaced- under warranty. |
| 50000 mi | Traction control can be turned on and off on vehicle. Traction control was not able to be turned off. PBM computer module defective. |
| 71000 mi US $1000 |
Power steering belt replaced; worn out |
| 139200 mi US $307 |
Slighty overheating, thought it was the thermostat so I had it replaced at a local shop, was not thermostat, the thermostat guage went out and had to be readjusted for $100 at dealership. |
| 137000 mi US $976 |
Started driving about a mile down the road, went dead, would not fully start back up. Would only start up for about 2 seconds, then would do a horrible idle and go dead. Ended up towing it and replacing the fuel pump. |
| 72000 mi US $140 |
check engine light on, OBD II code indicated a bad evap solenoid, also got messages about fuel cap being loose. Replaced the evap solenoid, issue fixed. |
| 74000 mi US $250 |
Check engine light was on and the thermostat was replaced which fixed the problem. |
| 78300 mi US $483 |
Radiator was leaking at the top. Replaced radiator. |
| 95000 mi US $50 |
Hard to start in cold. Replaced spark plugs. |
| 89200 mi US $2000 |
Fuel Tank leaked had to replace it. Upstream Oxygen Sensor bad, had that replaced. Fuel pump rusted, connectors broke and had to replace pump and a fuel hose. |
| 95000 mi US $15 |
Radiator Cap Leak |
2006 Hummer H3 4dr SUV
| 162000 mi US $3895 |
Replaced engine do to wrong oil filter was blown off and seized engine Broken Motor Mounts Replaced Both Map Sensor |
2006 Hummer H3 4-door
5-cylinder automatic 4WD
| 7000 mi | Needs new head in cylinder one |
| 9000 mi | Needs new head in cylinder one. Repair period started in May and finished over a week later in June. |
| 79000 mi US $400 |
Dreaded cylinder head problem found mainly in the 06 H3. |
2006 Hummer H3 4-door
4-cylinder automatic AWD
| 3000 mi | Vehicle stability failure. Please service message came on and I was unable to switch from 4wd drive. These buttons did not work. Mechanic said it was the encoder motor. |
2006 Hummer H3 2-door
Engine not specified
| 21000 mi | Bad cylinder head. Ordered replacement. |
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