2008 Pontiac G8 Pontiac G8 2008

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2008 Pontiac G8 Engine Problems and Repair Histories

2008 Pontiac G8 repairs by problem area

Engine (20%)

Transmission and Drivetrain (4%)

Brakes and Traction Control (5%)

Suspension and Steering (34%)

Electrical and Air Conditioning (21%)

Paint, Rust, Leaks, Rattles, and Trim (8%)

Other (7%)

Chart based on 99 repairs.

2008 Pontiac G8 4dr Sedan

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

4000 mi Hesitation when taking off...fixed with transmission computer flash update. 
47000 mi Pulled a P0445 and P0449 code. Replaced gas cap for P0455 and replaced EVAP canister/solenoid for P0449. No issues since. 
27000 mi

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 mi

US $3500
Catastrophic valve train failure 
5896 mi Trans ECU reflash, bulletin #080730036 
10000 mi Evap leak indicated, check engine light cleared, has not come back in 4 weeks. 
11000 mi replaced fuel cap due to EVAP leak 
14000 mi looses antifreeze every 6 months or so, second time needed to refill, no leak found. 
8000 mi Engine oil leak. 
48000 mi Rattling cold transmission fixed with TCU and ECU update. 
6000 mi Engine replaced due to piston slap. 
16000 mi 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 mi Valve spring broke, also causing the #7 intake runner to have a leak. Everything was fixed under warranty. 

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2008 Pontiac G8 4dr Sedan

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

75000 mi Engine Timing Chain. The chain was stretched and needed to be replaced. Was under warranty. 
78300 mi Ignition key was worn out causing the the key to not turn to the off position to remove the key. Currently using the sapre key and have had no issues. 
47000 mi

US $88
Engine light went on. Was able to quickly fix the gas cap problem. 
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. 
57000 mi CEL, stretched timing chain. TC replaced by dealer.  

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2008 Pontiac G8 4-door

6-cylinder automatic 2WD

70000 mi

US $2400
Timing chain stretched. Timing chains replaced. 

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2008 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 2008 Pontiac G8 problems occur, check out our car reliability stats.