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2008 Pontiac G8 Engine Problems

65 TrueDelta members own (or used to own) a 2008 Pontiac G8. 14 of these members (21.5%) have reported engine repairs for their car. A total of 20 engine repairs to 2008 Pontiac G8s--an average of 0.3 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 2008 Pontiac G8 problems occur, check out our car reliability stats.

Chart based on 83 repairs.
Non-members can see only ten 2008 Pontiac G8 repair histories. Log in or join us to see them all.

2008 Pontiac G8 4dr Sedan

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

47000 mi   Pulled a P0445 and P0449 code. Replaced gas cap for P0455 and replaced EVAP canister/solenoid for P0449. No issues since. 
27000 US $60 Gasket for the axle back system failed causing a severe leak and carbon monoxide(exhaust fumes) could be smelled heavily inside the car when stopped ie warming up, stop light, idling while parked. 
59000   Catastrophic valve train failure 
4000   Hesitation when taking off...fixed with transmission computer flash update. 
10000   Evap leak indicated, check engine light cleared, has not come back in 4 weeks. 
11000   replaced fuel cap due to EVAP leak 
14000   looses antifreeze every 6 months or so, second time needed to refill, no leak found. 
6000   Engine replaced due to piston slap. 
16000   Defective valve spring replaced. Sounded horrible, like it was having a really hard time running, as if not getting enough air. Even died on me several times (during my troubleshooting, I wasn't driving it after the initial "Check Engine" light came on). Defective valve spring replaced again the next day while visiting family, so second dealer. First dealer had left piece of plastic, approximately 2 in x 1/2 in, underneath the valve spring, causing it to bend and therefore malfunction. 
17000   Valve spring broke, also causing the #7 intake runner to have a leak. Everything was fixed under warranty. 
8000   Engine oil leak. 

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2008 Pontiac G8 4dr Sedan

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

73000 mi   Service engine soon came on for emission issue. This was due to a faulty gas cap. This was previously replaced, but found the replacement was the INCORRECT gas cap! Dealer also cleared the service engine code. 
47000 US $88 Engine light went on. Was able to quickly fix the gas cap problem. 
57000   CEL, stretched timing chain. TC replaced by dealer.  

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