4th generation · GM N-body · 3,204 complaints, 393 with mileage
Owners filed 3,204 complaints with NHTSA about the 1992–1998 Pontiac Grand Am, and 393 of them record the mileage at which the failure happened. That is enough to show not just what fails, but when.
49% of failures occur beyond 100,000 miles — a wear pattern. The car generally reaches substantial mileage before trouble starts.
The most-reported areas are the electrical system (19.7% of complaints, typically around 104,000 miles), the engine and its cooling system (14.9% of complaints, typically around 95,500 miles), the hydraulic brake circuit (14.1% of complaints, typically around 80,103 miles).
| System | Complaints | Share | Typical mileage | Middle half |
|---|---|---|---|---|
| Electrical System | 630 | 19.7% | 104,000 | 74,000–143,723 |
| Engine And Engine Cooling | 477 | 14.9% | 95,500 | 69,000–113,264 |
| Service Brakes, Hydraulic | 451 | 14.1% | 80,103 | 45,000–133,000 |
| Air Bags | 251 | 7.8% | 125,149 | 95,500–150,000 |
| Visibility | 176 | 5.5% | 74,629 | 30,000–95,000 |
| Power Train | 171 | 5.3% | 95,550 | 45,000–124,000 |
| Steering | 155 | 4.8% | 106,500 | 82,000–158,824 |
| Suspension | 116 | 3.6% | 89,548 | 50,000–142,572 |
| Exterior Lighting | 107 | 3.3% | 90,551 | 22,000–128,728 |
| Structure | 101 | 3.2% | 99,000 | 56,000–120,000 |
| Year | Complaints | With mileage |
|---|---|---|
| 1992 | 304 | 7 |
| 1993 | 290 | 15 |
| 1994 | 515 | 37 |
| 1995 | 587 | 49 |
| 1996 | 672 | 104 |
| 1997 | 600 | 124 |
| 1998 | 236 | 57 |
Complaints about this generation are not spread evenly across the vehicle, and the systems that generate the most of them do not all fail at the same point in a car's life. The median failure across all systems here is 99,000 miles; the figures below show which parts of the car run ahead of that and which run behind.
The electrical system accounts for 19.7% of complaints (630 reports, 73 of them with a mileage figure), with a median of 104,000 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 74,000 and 143,723 miles.
The engine and its cooling system accounts for 14.9% of complaints (477 reports, 70 of them with a mileage figure), with a median of 95,500 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 69,000 and 113,264 miles.
The hydraulic brake circuit accounts for 14.1% of complaints (451 reports, 19 of them with a mileage figure), with a median of 80,103 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 45,000 and 133,000 miles.
The airbag system accounts for 7.8% of complaints (251 reports, 70 of them with a mileage figure), with a median of 125,149 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 95,500 and 150,000 miles.
Visibility equipment accounts for 5.5% of complaints (176 reports, 26 of them with a mileage figure), with a median of 74,629 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 30,000 and 95,000 miles.
The transmission and driveline accounts for 5.3% of complaints (171 reports, 19 of them with a mileage figure), with a median of 95,550 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 45,000 and 124,000 miles.
Within this generation, complaint volume is not constant across model years. The 1996 model year drew the most — 672 complaints — while 1998 drew the fewest at 236. The median year sits at 515.
No recall campaigns covering this generation appear in NHTSA's post-2010 recall file. That is not the same as an absence of problems — recalls address safety defects specifically, and many of the complaints above concern faults that are expensive or annoying without meeting that threshold.
Of the 3,204 complaints filed against this generation, 279 reported a crash; 138 reported a fire; 323 reported an injury; 27 reported a fatality. Crash-involved reports represent 8.7% of the total.
These are owner-reported outcomes, not verified investigations, and they are not adjusted for how many of these vehicles are on the road. They are included because the distinction between a fault that strands a car and a fault that causes a collision is the one that matters most, and it is not visible in a complaint count alone.
For a buyer, a late-failure pattern shifts the question from whether to when. 49% of reported failures occur beyond 100,000 miles, so an example approaching that figure is approaching the range where other owners started reporting problems. The middle half of all failures falls between 63,095 and 135,000 miles.
On inspection, the electrical system and the engine and its cooling system are where this generation's reports concentrate, so those are the areas worth a specific look. The engine and its cooling system in particular shows a median failure mileage of 95,500, which gives a concrete number to compare against the odometer of any car you are considering.
None of this is a substitute for a pre-purchase inspection on the individual car. Aggregate patterns describe a population; the example in front of you has its own history.
3.1L V6 lower intake manifold gasket degradation, allowing coolant into the crankcase and/or external coolant seepage; associated with Dex-Cool long-life coolant and the nylon-carrier/silicone gasket design used across GM 3.1L/3.4L 60-degree V6s. Subject of the GM Dex-Cool class action covering roughly 1995-2003 3.1L/3.4L vehicles.
2.4L LD9 Twin Cam head gasket failure, often secondary to cooling-system neglect or overheating; also timing chain tensioner wear producing cold-start rattle.
Passlock/VATS theft-deterrent system faults cause intermittent crank-no-start with the security lamp lit; the fix is typically the ignition lock cylinder housing sensor rather than the engine.
Power window regulator cable/pulley failure, most often the front doors.