Cadillac STS Cadillac STS

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Cadillac STS repairs by problem area

Engine (29%)

Transmission and Drivetrain (8%)

Brakes and Traction Control (3%)

Suspension and Steering (10%)

Electrical and Air Conditioning (28%)

Paint, Rust, Leaks, Rattles, and Trim (15%)

Other (6%)

Chart based on 216 repairs.
See TSBs and recalls for the Cadillac STS.

Cadillac STS engine repair cost distribution

$2500+ (7%)

$1000 - $2499 (5%)

$500 - $999 (8%)

$100 - $499 (27%)

< $100 (53%)

Worried about potential repair costs? An extended warranty can provide peace of mind.

Chart based on 59 repair trips. The repair cost chart excludes repairs made under warranty, do-it-yourself repairs, and repair trips that include maintenance.

2007 Cadillac STS 4dr Sedan

255-horsepower 3.6L V6 5-speed shiftable automatic RWD

135801 mi

US $850
Check engine light on. Dealership wanted an additional $2,699.81 w/ tax to put timing chain on engine. Picked car up and had a private mechanic install GM timing chain. OEM GM timing chain, guides, tensioners, gaskets, etc. installed by independent mechanics 
138910 mi

US $1316
took back to mechanics when check engine light came back on and engine running rough again. mechanics could not fix recommended dealer for fix. After independent mechanics installed a timing chain and then 4 cam sensors on 5-2-2013 the engine still run rough. Dealer said it was a loose / worn bushing on a camshaft. Also timing off 2 teeth. 
140297 mi

US $235
Engine light on again. Car jerking when driving. Dealer found a timing gear slightly bent, they fixed it and that took care of the check engine light. However the jerking per dealer caused by torque converter failure. This issue not resolved 

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2007 Cadillac STS 4dr Sedan

255-horsepower 3.6L V6 5-speed shiftable automatic AWD

93000 mi

C $400
Replaced faulty Bosch electronic ignition coil #2 

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2006 Cadillac STS 4dr Sedan

supercharged 469hp 4.4L V8 6-speed shiftable automatic RWD

85000 mi

US $800
water pump leak 
85000 mi Thermostat not working. Had to order part 
139000 mi

US $100
Coolant leak in one of the lines. Replaced the line and also the thermostat while I was at it. 

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2006 Cadillac STS 4dr Sedan

320-horsepower 4.6L V8 5-speed shiftable automatic RWD

70300 mi The car needed a new motor mount. 
76000 mi Check Engine light on, replaced thermostat and water pump. 

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2006 Cadillac STS 4dr Sedan

320-horsepower 4.6L V8 5-speed shiftable automatic AWD

54040 mi

C $800
Water pump leak. Pump and thermostat replaced. 
69700 mi

US $2500
Oil leak due to faulty seal, mfg. defect! GMC paid for approx. 1/3 of the repair after we dogged them for 6 months.Our extended warrenty had just run out when we noticed leak! 

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2006 Cadillac STS 4dr Sedan

254-horsepower 3.6L V6 5-speed shiftable automatic RWD

49000 mi The check engine light had been on for several months. The car would not start one morning and I called onstar and they towed to the dealer. They said that they replaced a "purge valve" and there was no charge for the service or towing. 
67000 mi Coil on the #3 cylinder cracked and needed to be replaced. 
69000 mi The right side catalytic converter needed to be replaced and was covered under the cadillac warranty. 
73000 mi

US $350
An ignition coil failed on one of the cylinders. 
78000 mi

US $3400
Using 1 qt oil per 700 miles. Diagnosed as piston ring problem. Put in new rebuilt short block. After haggling GM paid labor, I paid parts. 
34500 mi evaporative purge valve replaced 
58000 mi

US $660
Check Engine light on-drove for about a month. Replaced valve to repair-also cleaned injectors and replaced fuel filter this trip 
76300 mi Lower end seals 

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2006 Cadillac STS 4dr Sedan

254-horsepower 3.6L V6 5-speed shiftable automatic AWD

55000 mi

US $200
Service engine 

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2005 Cadillac STS

Engine not specified

82000 mi catalytic converter failed. 

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2005 Cadillac STS 4dr Sedan

320-horsepower 4.6L V8 5-speed shiftable automatic RWD

55000 mi

US $1293
Leaking heater core had to be replaced. 
60000 mi

US $460
Replaced water pump 
109100 mi

US $4000
Aor leak in fuel system and a bad coil.  Catalytic converter is going out. 
53000 mi

US $168
Service engine soon light coming on. Replaced MAF sensor. 
148000 mi CHECK ENGINE LIGHT CAME ON AND ENGINE RAN VERY ROUGH. THE PLUGS AND COIL PACKS NEEDED TO BE REPLACED. REPLACED VALVE COVER GASKETS TO SOLVE A LEAK. 
52000 mi

US $70
Service Engine light comes on intermittently. Not related to gas cap being loose. Happens about every 500-800 miles, then goes off again. Code is PO420, Converter system below threshold. 
60000 mi Fuel gauge quit after bad gas. Bought entire tank from salvage yard, which included both sending units and fuel pump. Had to remove exhaust, drive shaft, and suspension to access tank. Mass air flow sensor was cleaned to determine if it was causing SEL to come on. Oil from K&N air filter apparently was causing it. After sensor cleaned, light hasn't come back on. 
109000 mi check engine light would go on for a week then off for a day or two then back on again. Catalytic converter was showing as problem on computer, it was replaced under warranty work, since others have had same issue, but there wasn't a recall 
106000 mi

US $400
Thermostat leak 
48000 mi Check engine coolant on DIC. Coolant was full. Replaced coolant resevoir. 
141700 mi

US $285
Check Engine light comes on every two weeks. No error code. Cause unknown. 
43000 mi Water pump and front timing cover replaced. Engine was leaking oil and coolant. Drivers interior door handle replaced. Chrome was flaking off. both were covered under warranty 

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2005 Cadillac STS 4dr Sedan

320-horsepower 4.6L V8 5-speed shiftable automatic AWD

44000 mi Had transmission software updated.  
65000 mi

US $148
I took car in for a CEL and oil change. Dealer said cats needed to be replaced and the right motor mount was bad. Dealer had to order parts. had cats replaced and  a left motor mount replaced and now told my transfer case needed repair. 
61000 mi Check Engine Light and loss of power. Catalytic Converter failed. Dealer replaced only the one that failed under 8 year emission warranty. 
63000 mi

US $15
Check engine light came on with code P0442. Owner replaced fuel cap with new and reset CEL. 
78200 mi Mass Air Flow Sensor came detached from air filter box. It unscrewed itself. 
83900 mi Check engine light. Reports MAF problems: P1101, P0068. Cleared codes. Code comes back periodically. 
89000 mi

US $60
Replaced Mass Air Flow Sensor (MAF) due to P1101 P0068 P0174. Earlier efforts to clean the MAF did not fix the problem. Bought new MAF and installed it, which also did not help. Codes returned about two weeks later. The warning light comes and goes. It usually comes on with an outdoor cold start (<40 degrees F). I've since found a TSB that says the ECM can be reprogrammed because of these codes appearing on cold starts. I won't bother with the TSB because that will be a dealer work item = expensive. In retrospect, the MAF sensor replacement was not needed. The MAF code is a misleading indicator caused by an ECU problem. 
51000 mi Replaced 2 broken motor mounts. 
63000 mi

US $1200
I had what I thought was a water hose leak that turned out to be the water pump. I decided to have all belts and hoses replaced since the car is 5 years old and Arizona heat kills rubber and I don't want it breaking on the road. 
64700 mi Bad intake camshaft position sensor, required engine teardown 
66000 mi Mass Airflow Sensor Replacement - They needed to order some parts so it took an extra day, but they gave me a loaner car, so I am fine with that. 
114000 mi

US $15
MAF showing Check engine code 
61000 mi

US $100
coolant leaks, water pump 
63300 mi

US $200
two catalytic convertors 
87000 mi

US $100
P0113 
179800 mi

C $1
GM changed both catalytic converters and exhaust manifolds assembly and oxygen sensors under a special guaranty to 200000 miles or 14 years(only 2005). Works fine since then but still check engine on :( i have to replace MAF sensor. 
210180 mi GM changed the catalytic converters on a secret warranty 
32240 mi Check Engine light came on: catalyst converter not working. Ordered new one under warranty. The problem went away very soon which was the reason I could not replace the converter earlier when both got damaged by poor premium grade gasoline quality. 

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2005 Cadillac STS 4dr Sedan

255-horsepower 3.6L V6 5-speed shiftable automatic RWD

64300 mi

US $675
No power to ignition from start button 
67300 mi

US $365
No power to ignition switch 
97000 mi

US $2500
Catalytic converter on the right side clogged up.. resulting in the right side of the motor heating up and losing compression..Engine Change..was cheaper than a tear down... 

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2005 Cadillac STS 4-door

6-cylinder automatic 2WD

54000 mi Traction Control Active, cuts engine out upon acceleration from a stop. 

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Cadillac STS Engine Problems

See our lemon odds and nada odds page to see vehicles with no repairs or vehicles with more than three repairs. To see how frequently Cadillac STS problems occur, check out our car reliability stats.