2003 Mercury Grand Marquis vs 2003 Pontiac Bonneville
Complaints, recalls, TSBs, investigations and safety ratings side by side, from official federal data. Last verified Aug 8, 2026. Raw complaint counts are not adjusted for sales volume.
| Metric | 2003 Mercury Grand Marquis | 2003 Pontiac Bonneville |
|---|---|---|
| NHTSA complaints | 362 | 54 |
| Recall campaigns | 1 | 2 |
| Service bulletins (TSBs) | 90 | 424 |
| Investigations | 6 | 0 |
| Crash reports | 22 | 3 |
| Fire reports | 2 | 5 |
| NCAP overall rating | — | — |
| EPA MPG (combined) | 18 | 19–21 |
| Median reported incident mileage | 87,000 mi | 78,029 mi |
Reported problems side by side
| Component | Mercury Grand Marquis | Pontiac Bonneville |
|---|---|---|
| Exterior Lighting | 207 | 1 |
| Electrical System | 51 | 10 |
| Steering | 28 | 10 |
| Suspension | 28 | 0 |
| Vehicle Speed Control | 27 | 1 |
| Engine and Engine Cooling | 13 | 6 |
| Power Train | 12 | 6 |
| Air Bags | 11 | 3 |
Symptoms owners describe
| Stalling | 15 | 0 |
| Rust / corrosion | 10 | 0 |
| Vibration / shaking | 5 | 0 |
| Clunking / rattling | 0 | 8 |
2003 Mercury Grand Marquis
2003 Pontiac Bonneville
Compare all Mercury Grand Marquis vs Pontiac Bonneville years →
Method. Complaints are unique NHTSA reports. A vehicle that sold more units will naturally accumulate more complaints — use shares and read the underlying reports before drawing conclusions.