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2009 Pontiac G8 repairs by problem area

Engine (26%)

Transmission and Drivetrain (4%)

Brakes and Traction Control (4%)

Suspension and Steering (19%)

Electrical and Air Conditioning (26%)

Paint, Rust, Leaks, Rattles, and Trim (16%)

Other (5%)

Chart based on 291 repairs.

2009 Pontiac G8 engine repair cost distribution

$2500+ (6%)

$1000 - $2499 (24%)

$500 - $999 (24%)

$100 - $499 (29%)

< $100 (18%)

Chart based on 17 repair trips. The repair cost chart excludes repairs made under warranty, do-it-yourself repairs, and repair trips that include maintenance.
Non-members can see only ten 2009 Pontiac G8 repair histories. Log in or join us to see them all.

2009 Pontiac G8 4dr Sedan

361-horsepower 6.0L V8 6-speed shiftable automatic RWD

14000 mi Valvetrain noise at cold start. No longer making the noise 
6150 mi Fuel pump located in gas tank. Had to get a tow and a rent a car. 
23000 mi

US $20
E-VAP code so I replaced the gas cap. An OEM pontiac G8 8 cap.. Check Eng. light was out (Off) in less then a minute. 
6000 mi Mass air flow sensor failure 
35000 mi Engine running rough, camshaft lobe and bearing pitted and galled on cylinder 7. Replaced camshaft and bearing. 
9000 mi Engine light coming on. Fuel cap replaced. It was leaking pressure and making the system think the cap was off.  
20000 mi Three times early on had car in shop for a rough idle. Ultimately told this is just how the 6-liter V8 idles. 
12000 mi Rear main plate / main seal was small motor oil leak. Widely known issue with Generation IV "small block" engines. TSB Technical Service Bulletin exists for problem with solution & parts. 
5500 mi Check engine light for fuel evaporative emissions. Faulty connection to fuel tank, fuel tank replaced. Compass in mirror intermittently reversing north and south readings. Rear view mirror replaced and issue resolved. 
6000 mi Check engine light, vacuum test determined leak and smoke test pinpointed at faulty gas cap. New gas cap installed and issue resolved. 
8000 mi Check engine light, came up evaporative emissions related. Dealer said it was a current code, but could not find a leak. Reset light and has not come back since. 
19000 mi Check engine light for evaporative emissions. Could not replicate problem, code was a history code and not presently happening. Reset and has not come back on yet. Same issue in July '09. 
55000 mi

US $240
Check engine light came on, gas cap was bad and replaced (2nd replacement since new). 
100700 mi

US $600
Neck connecting hose to radiator broke off, causing vehicle to overheat. Replaced thermostat and hoses in addition to the new radiator. 
10000 mi Check engine light due to faulty gas cap, new style cap ordered. 
25000 mi CEL on at approx 24000 mi while on extended trip. OnStar diagnostics advised continue driving for a week or so. After 1000 mi over 6 days, CEL still on. At dealer, found DTC P0442 (evap leak); smoke test ok, but cleaned filler cap gasket. 
35000 mi Taken to dealer with vibration complaint at highway speeds, only apparent during AFM 4-cylinder operation. Engine mounts replaced, problem solved. 
1000 mi Reflashed computer for a better shifting transmission. 
24000 mi

US $90
Oil pan leak. Warranty covered 
6200 mi oil pan leaking from rear of pan 
9000 mi The oil pan was leaking I had to wait about one month for the part to arrive but was still able to drive the car. 
14000 mi After I had the oil pan resealed, I rechecked it and a block above the pan was leaking.  
17000 mi Oil pan leaking they fixed it and within weeks it was leaking again and they just gave me the run around saying it wasn't the pan. Finally they just resealed the pan. 
21000 mi The key would not stay locked in and the fob was falling apart. 

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2009 Pontiac G8 4dr Sedan

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

7000 mi Engine light came on. Gas cap would not "seat" right, had to be replaced 

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2009 Pontiac G8 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 2009 Pontiac G8 problems occur, check out our car reliability stats.