AI-generated · grounded in NHTSA data
Reliability & 5-year cost of ownership — 2003 Pontiac Bonneville
Overall rating NHTSA-grounded
Average
Estimated 5-year repair + maintenance cost: $7,000–$11,000
The 2003 Pontiac Bonneville has an average reliability rating due to issues with the steering, electrical components, and engine, alongside airbag and fuel system recalls. The vehicle's problems are common but not prevalent enough to lead to a below-average rating.
Most-common failures
| Part | Typical mileage | Cost range | Frequency |
|---|---|---|---|
| steering system | 80,000–110,000 miles | $250–$700 | common |
| electrical system | 70,000–100,000 miles | $300–$800 | common |
| engine | 90,000–120,000 miles | $1,000–$2,500 | occasional |
| airbags | 60,000–90,000 miles | $400–$1,000 | occasional |
| fuel system | 85,000–115,000 miles | $200–$600 | occasional |
Scheduled maintenance to budget
Routine items every owner should plan for.
- Oil and filter change
- Brake fluid replacement
- Transmission fluid change
- Coolant system service
- Timing belt inspection
- Spark plug replacement
- Air filter replacement
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- Steering tightness or noise
- Dim or flickering lights
- Rough engine idle
- Unusual fuel smells
- Airbag warning light on
Generated by gpt-4o on 8/23/2026. Cost ranges are conservative estimates that account for typical regional variation.