2008 Pontiac G8 Problems

What owners report

Owners of the 2008 Pontiac G8 most often describe an airbag fault warning that appears at startup and leaves the airbag system inactive, commonly tied to the passenger seat sensor. Front suspension ball joint wear and ignition key problems are also frequently reported, with a mix of low-mileage and higher-mileage vehicles.

1. 1
   Air bags

   Airbag fault light / passenger seat sensor

   • 22 complaints (31%)
   • median 60,000 mi at 7.0 yrs old (21 state mileage)
   • owner-quoted repair $1,000 (median of 7 quotes)
   • filed 2009–2020

   Owners describe an 'airbag fault' or SRS warning appearing at startup or intermittently, often accompanied by a chime, with fault codes U0170 and B0081 mentioned repeatedly. Several say the dealer identified the passenger presence or seat module as the source, quoted repair costs of several hundred to about a thousand dollars, and that the warning means the airbag system is inactive. Some report the light returning after a recall reprogram or module replacement, and a few traced it to a loose connector under the seat. Reported from roughly 5,000 to 130,000 miles, with many between 30,000 and 105,000 miles, often on vehicles several years old.

   Recall 11V534000

   What to check: Turn the key to run and watch whether the airbag or SRS light stays on or chimes, and ask for stored airbag codes. Ask whether the passenger seat module and any airbag recall work have been done.

   2 excerpts from owner complaints in NHTSA records

   “There was a recall for the air bags in my 2008 Pontiac G8. Two week after I had this problem fixed at the GM dealer, my air bag failure light came on, indicating that if I were in a crash, my air bag may not work properly. I believe these two issues are related, even though the GM dealer stated they were not.”

   NHTSA complaint #10453530, filed 2012-03, 60,000 miles

   “Air bag fault light comes on when car is started, which means that the air bags will not work. There is an air bag recall to this car, but they will not fix my car's fault light problem. This is a big safety defect that many GM have, according to your website. Thank you my car has 30,000 miles on it.”

   NHTSA complaint #10913783, filed 2016-10, 30,000 miles
2. 2
   Suspension

   Worn front lower control arm ball joints

   • 10 complaints (14%)
   • median 38,811 mi at 3.4 yrs old (10 state mileage)
   • filed 2009–2012

   Owners describe clunking or crunching from the front end over bumps, front-end vibration, and shaking or shimmy when turning or braking. Dealers and shops commonly diagnosed worn lower ball joints or control arms and quoted replacement, sometimes noting excessive front tire wear. Several owners mention a service bulletin covering the control arms rather than a recall, and some report the work being declined under warranty or extended coverage. Mostly reported between about 18,000 and 60,000 miles, sometimes with both sides affected at different times.

   3 related service bulletins

   What to check: Have the front end inspected on a lift and ask whether the lower control arms or ball joints have been replaced; check front tire wear for uneven patterns.

   2 excerpts from owner complaints in NHTSA records

   “I brought my 2008 Pontiac gt to the dealer last month to have the control arms inspected. Car has 18,100 miles on it. The tech told me both lower ball joints were shot and they would overnight the parts. I told him there was a recall on ball joints but my VIN was not included. I also brought a copy of the TSB for the ball joints and told him I wanted all 4 control arms, not just the 2 lower ones. The exact wording of the TSB is ... …”

   NHTSA complaint #10312367, filed 2010-02, 18,000 miles

   “I first noticed this last year when I went to ny for thanksgiving. Everytime I turned to the left my car would shimmy and shake, I was told I was missing a weight on my rim so I didn't think anything of it. As the year went on it would only happen every so often and at times would do it at all. It started to act up again but wouldn't stop and even stepping on my brakes would cause it. I brought it to a local shop and they advised that my ball joints were shot and to bring it to a dealer. …”

   NHTSA complaint #10428290, filed 2011-10, 86,000 miles
3. 3
   Electrical system

   Ignition key hard to turn or remove

   • 14 complaints (20%)
   • median 95,500 mi at 6.7 yrs old (10 state mileage)
   • 2 mention a crash, fire or injury
   • filed 2011–2025

   Owners describe the key turning only partway when parking and sticking in the ignition, sometimes requiring several attempts or cycling the gears to release it. Others report the key being bumped out of the run position while driving, including by a knee, and one owner describes the folding key breaking apart. Several complaints reference the ignition recall and note that parts were unavailable or that the repair was not performed. Reported from around 45,000 to 135,000 miles, often during everyday parking and driving.

   Recall 14V540000

   What to check: Ask whether recall 14V540000 was completed and confirm the key turns freely and releases in Park. Test that the engine stays running with the key in the run position.

   2 excerpts from owner complaints in NHTSA records

   “The key fob contains the ignition key and unfolds with a button press, but the spring mechanism holding it open is a bit weak. When you have it attached to a key chain, the weight of the keys can fairly easily make the key fob fold over in an l shape with the key in the ignition. This happens while driving often, and being 6 ft 1 in tall, my knee bumped the keys while I was putting my foot back and forth between the gas pedal and on the brake. …”

   NHTSA complaint #10577272, filed 2014-04, 87,000 miles

   “After putting the vehicle in park, the key will only turn halfway. This results in the key being stuck in the ignition. This occurs intermittently, but tends to get worse the more frequently the vehicle is driven. Only way I have been able to remove the key is to turn the vehicle back on and rotate thru the gears. Sometimes it takes 5 or 6 tries. Also the side view mirrors will not operate all the time either and according to the dealer, the mirror and the key ignition run thru the same wire harness in the shifter mechanism. …”

   NHTSA complaint #10405286, filed 2011-06, 45,020 miles
4. 4
   Transmission and drivetrain

   Laggy throttle and slow transmission downshifts

   Mentioned in 4 of 60 sampled complaints

   Owners of early-production cars describe a delay between pressing the accelerator and the car responding, along with slow downshifts and unpredictable behavior when merging or in traffic. Complaints attribute this to the engine and transmission control programming rather than a mechanical failure. Reported on very low-mileage cars, from a few hundred to about 5,500 miles.

   2 related service bulletins

   What to check: Test-drive from a rolling start and note whether throttle response and downshifts feel delayed; ask whether any control module reprogramming has been done.

   2 excerpts from owner complaints in NHTSA records

   “My safety issue with my 2008 Pontiac G8 gt are as follows: laggy throttle/transmission response causes precarious positions. Hampers accident avoidance. May cause car to accelerate faster than intended resulting in a accident. For example pressing the accelerator part way results in a long delay before the car responds. When the car does respond it may accelerate at a much faster rate than intended. There is no actual acceleration feedback while pushing the gas pedal because of the delay. …”

   NHTSA complaint #10235485, filed 2008-07, 2,500 miles

   “Automatic transmission displays unacceptable latency during downshifts and unpredictable response to throttle inputs . This results in unpredictable vehicle behavior, especially during freeway merges or other situations where a moderate amount of engine power is required. This is an ongoing, constant problem that I believe is related to poor programming of the engine control module and transmission control module.”

   NHTSA complaint #10234705, filed 2008-07, 5,500 miles

Buying note. Have a pre-purchase inspection focus on the airbag warning light and stored codes, the front ball joints and control arms, and the ignition key operation, and confirm which recalls have actually been completed. Records of radiator and cooling system service are also worth asking for.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.