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2009 Pontiac G8 Engine Problems

148 TrueDelta members own a 2009 Pontiac G8. 37 of these members (25%) have reported engine repairs for their car. A total of 65 engine repairs to 2009 Pontiac G8s--an average of 0.4 per vehicle--have been reported.

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.

Problems by area
Repair cost distribution

Percentage of 2009 Pontiac G8 repairs by problem area

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Chart based on 249 repairs.

2009 Pontiac G8 engine repair cost distribution

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Chart based on 8 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.

14000 mi

Valvetrain noise at cold start. No longer making the noise

6150		Fuel pump located in gas tank. Had to get a tow and a rent a car.
23000	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		Mass air flow sensor failure
35000		Engine running rough, camshaft lobe and bearing pitted and galled on cylinder 7. Replaced camshaft and bearing.

9000		Engine light coming on. Fuel cap replaced. It was leaking pressure and making the system think the cap was off.
20000		Three times early on had car in shop for a rough idle. Ultimately told this is just how the 6-liter V8 idles.

12000

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		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		Check engine light, vacuum test determined leak and smoke test pinpointed at faulty gas cap. New gas cap installed and issue resolved.
8000		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		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	US $240	Check engine light came on, gas cap was bad and replaced (2nd replacement since new).

10000		Check engine light due to faulty gas cap, new style cap ordered.
25000		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		Taken to dealer with vibration complaint at highway speeds, only apparent during AFM 4-cylinder operation. Engine mounts replaced, problem solved.

1000		Reflashed computer for a better shifting transmission.
24000	US $90	Oil pan leak. Warranty covered

6200		oil pan leaking from rear of pan
9000		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		After I had the oil pan resealed, I rechecked it and a block above the pan was leaking.
17000		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		The key would not stay locked in and the fob was falling apart.

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7000 mi

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