Reliability & 5-year cost of ownership — 2018 GMC Sierra Denali
NHTSA data on file today
try.vin couldn't confirm NHTSA's recall list for the 2018 GMC Sierra Denali, so this page doesn't state a recall count — check the VIN at nhtsa.gov/recalls for current campaigns. 17 owner complaints are on file.
Most-cited components in owner complaints
- Engine 5 complaints
- Service Brakes 4 complaints
- Structure 4 complaints
- Exterior Lighting 3 complaints
- Steering 3 complaints
- Electronic Stability Control (ESC) 2 complaints
Together, the 17 complaints on file report 1 injury (owner-reported, not verified by NHTSA).
Average
Estimated 5-year repair + maintenance cost: $6,500–$12,000AI estimate — not from NHTSA data
The 2018 GMC Sierra Denali has an average reliability rating with common issues primarily in engine and brake systems. While not severely problematic, buyers should remain alert to potential repairs beyond normal wear and tear.
Most-common failures
| Part | Typical mileage (AI estimate) | Cost range (AI estimate) | Frequency |
|---|---|---|---|
| ENGINE | 60,000–100,000 miles | $1,500–$3,500 | common |
| SERVICE BRAKES | 40,000–80,000 miles | $300–$800 | common |
| STEERING | 70,000–110,000 miles | $1,000–$2,500 | occasional |
| EXTERIOR LIGHTING | 50,000–90,000 miles | $200–$500 | occasional |
| STRUCTURE | 80,000–120,000 miles | $500–$2,000 | occasional |
AI estimate — not from NHTSA data: the mileage bands and repair-cost ranges above. Get a written repair quote before you budget.
Scheduled maintenance to budget
Routine items every owner should plan for.
- Oil changes every 7,500 miles
- Brake pad replacement every 40,000 miles
- Tire rotation every 10,000 miles
- Transmission fluid change at 60,000 miles
- Coolant flush at 100,000 miles
- Spark plug replacement at 100,000 miles
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- Engine misfires or rough idle
- Unusual brake noises or vibrations
- Steering wheel play or noise
- Flickering or dim headlights
- Rust or structural deterioration
Generated by gpt-4o on from the NHTSA recall campaigns and owner-complaint counts on file for the 2018 GMC Sierra Denali at the time. The rating is an AI assessment; cost and mileage figures are AI estimates, not NHTSA data.