AI-generated · grounded in NHTSA data
Reliability & 5-year cost of ownership — 2008 Gmc Sierra Denali
Overall rating NHTSA-grounded
Average
Estimated 5-year repair + maintenance cost: $7,000–$12,000
The 2008 GMC Sierra Denali has a moderate number of complaints, mainly concerning the structure and airbags. No widespread severe issues are evident, resulting in an average reliability outlook.
Most-common failures
| Part | Typical mileage | Cost range | Frequency |
|---|---|---|---|
| structure | 90,000–120,000 miles | $300–$600 | common |
| airbags | 70,000–100,000 miles | $400–$900 | occasional |
| electrical system | 80,000–110,000 miles | $200–$500 | occasional |
Scheduled maintenance to budget
Routine items every owner should plan for.
- oil and filter change
- brake system check
- tire rotation and alignment
- engine air filter replacement
- coolant system flush
- spark plug replacement
- transmission fluid check
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- cracking noises in structure
- airbag light on
- flickering electrical components
- unresponsive locks
- soft brake pedal
Generated by gpt-4o on 8/22/2026. Cost ranges are conservative estimates that account for typical regional variation.