2008 Pontiac G8 Transmission and drivetrain Problems
- Complaints
- 8about this part
- Share
- 11%of 71 total for the year
- Median mileage
- 4,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 8 complaints about the transmission and drivetrain of the 2008 Pontiac G8, 11% of the 71 complaints for this model year. Where a mileage was given, the median is 4,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“I was driving down 95 south near baltimore at about 70mph at 7am this morning when my 2008 Pontiac G8 gt (with the l76 6.0lv8 engine) alerted me that the engine was hot. I immediately pulled over and when I popped the hood I saw the upper radiator hose was not attached to the radiator anymore and a lot of coolant had leaked everywhere. Upon closer inspection, I saw that the pastic radiator flange that the hose attaches too had broken off of the radiator and was in the hose. …”
NHTSA complaint #10432200, filed 2011-10, 66,000 miles“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“Automatic transmission displays unacceptable latency during downshifts and unpredictable transmission 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 #10234646, filed 2008-07, 2,500 miles“The automatic transmission exhibits different tendencies when trying to accelerate. This leads to unpredictable vehicle response. In one particular occasion I was attempting to merge into traffic and accelerated. The car hesitated for a good 2 seconds before accelerating leaving me to have to go off the shoulder because the cars from behind had caught up. This is an everyday problem and ruins the experience of the car.”
NHTSA complaint #10235723, filed 2008-07Related service bulletins
- 11009088Sep 16, 2024This service bulletin provides information on some vehicles that may rock or move slightly forward or rearward while in Park at start up after cold soak. This condition may be…
- 11001321May 16, 2024This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
- 11000119Apr 26, 2024This service bulletin provides technicians with information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
- 10249579Jan 12, 2024This PI bulletin advises the technician on the proper way to install the pistons in an engine.
- 10248721Dec 18, 2023This bulletin advises the technician that the 6L50 (MYB), 6L80 (MYC) and 6L90 (MYD) Transmission Oil Filter and Seal Kit part number 24236933 is currently transitioning from a…
- 10245395Nov 6, 2023This service bulletin provides a vibration analysis worksheet the technician can use in conjunction with the appropriate Vibration Analysis-Road testing procedure when diagnosing…
- 10247768Sep 1, 2023This Preliminary Information communication provides information to the technician of a complaint of a sag or hesitation when accelerating. The concern is present when coasting at…
- 10242061Aug 7, 2023This service bulletin provides technicians with updated information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
- 10237387May 30, 2023This service bulletin provides information on some vehicles that may rock or move slightly forward or rearward while in Park at start up after cold soak. This condition may be…
- 10234619Apr 6, 2023This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
Transmission and drivetrain: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2009 | 9 | 6% |
| 2008 | 8 | 11% |
Other parts of the 2008 Pontiac G8
25 complaintsElectrical system
14 complaintsSuspension
10 complaintsSteering
8 complaintsEngine
5 complaintsOther or unknown
4 complaintsBrakes
2 complaintsSeat belts
2 complaintsSeats
2 complaintsBody and structure
2 complaintsVisibility (wipers, defrost, mirrors)
2 complaintsElectronic stability control
1 complaints
← All problems reported for the 2008 Pontiac G8
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology