AI-generated · grounded in NHTSA data
Reliability & 5-year cost of ownership — 2009 Gmc Denali
Overall rating NHTSA-grounded
Average
Estimated 5-year repair + maintenance cost: $6,500–$9,000
The 2009 GMC Denali has minimal recall and complaint data available, suggesting average reliability. While this may hint at fewer widespread issues, the limited data can also indicate underreporting.
Most-common failures
| Part | Typical mileage | Cost range | Frequency |
|---|---|---|---|
| transmission | 100,000–150,000 miles | $1,500–$3,500 | common |
| air suspension | 90,000–120,000 miles | $1,000–$2,500 | occasional |
| brakes | 70,000–100,000 miles | $300–$800 | occasional |
Scheduled maintenance to budget
Routine items every owner should plan for.
- Oil and filter change
- Brake inspection and service
- Tire rotation and alignment
- Transmission fluid change
- Coolant system check
- Air filter replacement
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- Delayed transmission shifts
- Sagging rear suspension
- Spongy brake pedal feel
Generated by gpt-4o on 8/24/2026. Cost ranges are conservative estimates that account for typical regional variation.