This 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 accompanied by a clunk noise. This is a slight movement that is more often seen visually, rather than felt, when viewed from the outside and using the auto-start feature, if equipped.
full bulletin at NHTSA ↗2007 Pontiac Grand Prix powertrain problems
moderate 27 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
27
Recalls
0
Avg fix
$2,500
When does it fail?
Of the 27 powertrain complaints filed for the 2007 Pontiac Grand Prix, here's the actual mileage breakdown — failures cluster heaviest at 50,000-75,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Owners have filed 27 powertrain complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
No new NHTSA powertrain complaint has been filed on this vehicle in over 14 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering powertrain on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
full bulletin at NHTSA ↗This service bulletin provides technicians with information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
full bulletin at NHTSA ↗This PI bulletin advises the technician on the proper way to install the pistons in an engine.
full bulletin at NHTSA ↗This service bulletin provides a vibration analysis worksheet the technician can use in conjunction with the appropriate Vibration Analysis-Road testing procedure when diagnosing vibration concerns.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2007 Grand Prix powertrain cluster shows a consistent pattern of automatic transmission failure. Owners report slipping and harsh shifts from dead stops, with RPMs rising while the vehicle hesitates or lurches forward. On highways, the torque converter locks and unlocks erratically at cruising speeds, causing dangerous bucking. Some vehicles lose all forward gears suddenly, leaving drivers stranded—occasionally at traffic lights or mid-intersection. Transmission noise starts early in some cases (500 miles on new vehicles) and ranges from metal-on-metal clanking to roaring sounds traced to the bell housing.
Repairs prove ineffective: transmission flushes don't resolve the problem, and GM has supplied dealers with remanufactured transmissions instead of new ones. At least one owner's replacement transmission failed again within 10,000 miles. One vehicle had three different transmissions installed but problems persisted. Costs for rebuilds run $2,800–$3,600. Shift selector malfunction appears in some cases after repair—the shifter doesn't lock into gear and moves freely between Drive, Neutral, and Reverse from road bumps alone. Internal wear generates metal flakes in the transmission pan, signaling imminent failure. GXP models with the V8 engine appear particularly vulnerable, with owners suggesting the transmission was designed for lighter V6 use and runs too hot with the heavier V8 load.
Same Pontiac Grand Prix powertrain reports on nearby years: 2005 · 2006 · 2008
Failure modes owners describe
Transmission slipping and harsh/delayed shifts
Transmission slips between gears, especially on acceleration from stops, and shifts roughly or suddenly. Some owners report hesitation followed by hard slam into gear; others describe slipping that occurs intermittently or worsens over time. Occurs in both cold and hot conditions.
When: Reported across mileage range from 20,000 to 96,000+ miles; some failures early in ownership (within months), others after years of use.
Symptoms owners cite: Transmission slips when accelerating from a stop; Rough or harsh shifts, often around 1st-2nd or 3rd-4th gear transitions; Delayed acceleration; RPMs rise but vehicle hesitates to move; Hard slam into gear after hesitation; Torque converter locks and releases erratically at highway speeds (65-70 MPH), causing bucking; Transmission shudders or jerks during shifts; Slipping occurs intermittently, 3 out of 5 times or more often
Codes mentioned: P0700, P0843
Repairs/costs cited: Transmission flush attempted but ineffective. Dealers have replaced transmissions with GM remanufactured units; some owners report replacement transmissions failed again within 10,000 miles. One owner reported worn linkage; another found forward band broken at spot weld. Rebuilt transmissions referenced at ~$3,000–$3,600 cost.
Recalls/TSBs owners mention: GM acknowledged potential defect in final drive gears in at least one case. One TSB cited covering harsh shifts. GM remanufactured transmissions supplied to dealers instead of new units due to factory production priority.
Complete transmission failure and no-drive condition
Transmission loses all forward gears or becomes completely non-functional, leaving vehicle unable to move. Can occur suddenly without warning, creating safety hazard. Some owners stranded mid-traffic; others experienced loss of gears at traffic lights or during normal driving.
When: Mileage range 20,000–96,000 miles; failures reported as early as 20,000 miles and as late as beyond warranty (96,000 miles at 6 months out of warranty).
Symptoms owners cite: No forward gears; transmission enters neutral or becomes unresponsive; Vehicle will not accelerate or move in any gear despite engine running; Sudden complete loss of power transmission without warning; Engine revs but vehicle does not move, as if in neutral; Only reverse or manual (tap-shift) gears functional while forward gears fail or slip badly
Repairs/costs cited: Requires full transmission replacement. Rebuilt transmissions supplied by dealers; costs cited at $2,800–$3,600 plus labor. One case noted transmission pan filled with metal flakes (indicating internal wear/failure). Multiple transmission replacements did not resolve issue in at least one vehicle (three replacements attempted).
Transmission noise (clanking, metal-on-metal, roaring)
Loud mechanical noise emanating from transmission, particularly metal-on-metal clanking or roaring sounds. Noise traced to transmission bell housing. Occurs at idle and various speeds; may worsen over time or be intermittent.
When: Can appear very early (500 miles on new vehicle) or develop over time. One case noted noise at idle progressing to noise at various speeds after partial repair.
Symptoms owners cite: Loud metal-on-metal clanking noise from transmission bell housing area; Roaring sound (one owner described it like wheel bearing failure); Noise present at idle and at various speeds; Noise may be intermittent or constant
Repairs/costs cited: Dealer diagnosis included potential clutch pack issue. One repair involved replacing final drive gears and bearing; this did not resolve the noise. Noise persisted and worsened (from idle-only to all speeds) after partial repair. Full transmission replacement recommended by dealers.
Recalls/TSBs owners mention: Dealer cited a TSB covering the issue in one case, calling it 'normal.' GM acknowledged potential defect in final drive gears in another case.
Transmission selector (shift linkage/shifter) malfunction
Gearshift selector does not lock properly into gear position or moves freely between gears without driver input. Shifter loose or detents not functioning. Vehicle can shift into neutral unintentionally from bumps or road conditions.
When: Reported after transmission repair/replacement in some cases; also noted as wear issue after prolonged use (one owner reported worn linkage after years of operation).
Symptoms owners cite: Gearshift does not lock into place in selected gear; Shifter moves freely between Drive, Neutral, and Reverse without detent stops; Minor bumps or road pressure cause unintended shift into Neutral; Ability to shift into Reverse without depressing brake pedal or pressing pawl button on shifter; Worn linkage prevents proper gear engagement
Repairs/costs cited: Replaced remanufactured transmission still exhibited this problem (shifter loose, no detent locks). Linkage repair mentioned in one case as previous fix for similar symptom. Issue may indicate improper transmission installation or inherent defect in remanufactured unit.
Transmission overheating (high fluid temperature)
Transmission fluid temperature rises excessively, indicating inadequate cooling or excessive internal friction. One owner reported temps over 220 degrees. Factory external cooler insufficient for GXP V8 model application.
When: Reported during normal driving conditions; one case at 12,000 miles during acceleration. Suggests design inadequacy rather than gradual wear.
Symptoms owners cite: Transmission fluid temperature exceeds 220 degrees during normal driving; Harsh, rough shifting associated with high fluid temps; Poor acceleration in first gear when temps elevated
Repairs/costs cited: TCM (Transmission Control Module) replacement performed in one case along with transmission fluid flush and refill; this was a temporary fix. One owner notes factory external cooler appears insufficient for 5.3L V8 application in GXP model, suggesting design flaw.
Transmission rebuild failure (metal flakes in pan, internal wear)
Internal transmission wear generates metal debris visible in transmission pan. Indicates accelerated wear or manufacturing defect. Metal flakes appear suddenly between service intervals, pointing to rapid internal failure.
When: One case: fluid check clean at 12/12/13, metal flakes present by 2/4/14 (less than 2 months), despite no reported issues in that period.
Symptoms owners cite: Transmission pan filled with metal flakes/debris; Complete transmission failure shortly after metal debris appears; No warning signs prior to metal accumulation in some cases
Repairs/costs cited: Rebuilt transmission purchased and installed ($3,000 range). Presence of metal flakes indicates internal component failure, often bearing or gear wear.
Synthesized from 27 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
The issues I have with my 07 Pontiac grand prix gxp are the following more often than not now when taking off from a stop transmission revs up and slams into gear causing wheel spin going down highway torque converter will lock up and release at cruising speeds 65-70 MPH causing car to buck erratically causing stability issues. *tr
Tl* the contact owns a 2007 Pontiac grand prix. The contact was driving approximately 40 MPH and approaching a traffic stop signal when during braking, the transmission began to slip. As a result, the vehicle exhibited an abnormal jerking motion. The failure recurred five times. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the problem. The approximate failure…
Had powertrain trouble with your 2007 Pontiac Grand Prix?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the powertrain problem on the 2007 Pontiac Grand Prix?
It's a documented issue but not catastrophic. 27 complaints have been filed. Repairs average $2,500 and most owners catch it before it causes a breakdown.
At what mileage does the powertrain typically fail?
Across the 21 complaints that reported odometer mileage, most powertrain failures cluster between 60,000 and 96,000 miles, with the median around 80,000. A quarter of owners report trouble before 60,000; a quarter make it past 96,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $2,500 for powertrain repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to powertrain?
No active recalls currently cover powertrain issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2007/Pontiac/Grand Prix.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.