2020 Gmc SIERRA DENALI problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
9 owner complaints analyzed
0 distinct recall campaigns
6,700 mi median reported failure mileage
Scope: 2020 model year. Data snapshot: . 7 complaints include usable failure mileage.
This selection has limited data. It remains available for lookup but is excluded from search indexing.
Most common problems
Engine is the most frequently named component, appearing in 5 of 9 complaints (55.6%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Braking behavior | 3 | 33.3% |
| Engine operation | 1 | 11.1% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Engine | 5 |
| Service Brakes | 2 |
| Electrical System:Starter Assembly | 1 |
| Engine And Engine Cooling | 1 |
| Forward Collision Avoidance: Adaptive Cruise Control:Software | 1 |
Engine: 5; Service Brakes: 2; Electrical System:Starter Assembly: 1; Engine And Engine Cooling: 1; Forward Collision Avoidance: Adaptive Cruise Control:Software: 1
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 5 |
| 25,000 to 49,999 | 0 |
| 50,000 to 74,999 | 0 |
| 75,000 to 99,999 | 1 |
| 100,000 to 149,999 | 0 |
| 150,000 and above | 1 |
Under 25,000: 5; 25,000 to 49,999: 0; 50,000 to 74,999: 0; 75,000 to 99,999: 1; 100,000 to 149,999: 0; 150,000 and above: 1
Under 25,000 miles has the most reports with usable mileage (5). 2 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2020 | 3 |
| 2021 | 2 |
| 2023 | 2 |
| 2025 | 1 |
| 2026 | 1 |
2020: 3; 2021: 2; 2023: 2; 2025: 1; 2026: 1
Pattern summary
Engine leads the component reports. Braking behavior appears in 3 complaint narratives. Engine operation appears in 1 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 11367036 · 2020-10-29 (October 29, 2020)
TWO ISSUES BROKEN VALVE SPRING CAUSED ENGINE TO SHUT DOWN, SECOND SERVICE BRAKE, BRAKE FAILURE LIGHT, SERVICE ESC, SERVICE TRAILER BRAKE MESSAGES CAUSING BRAKE FAILURE
Owner-reported narrative. 350 miles reported. Look up ODI 11367036 at NHTSA ↗
Owner report 11406920 · 2021-04-07 (April 7, 2021)
BRAKES SQUEAK. STARTED ABOUT 3000 MILES. I HAVE COMPLAINED TO DEALER SEVERAL TIMES.
Owner-reported narrative. 3,000 miles reported. Look up ODI 11406920 at NHTSA ↗
Owner report 11519126 · 2023-04-26 (April 26, 2023)
The contact owns a 2020 GMC Sierra Denali. The contact stated while driving 65 MPH at night, the vehicle stalled and the “Shift to Neutral and Restart Vehicle” message was displayed. The contact was unable to restart the vehicle and was unable to visibly see the roadway. The contact was able to park on the side of the road. The vehicle was not drivable. The contact towed the vehicle to his residence, and then to the local dealer the next day, where the vehicle was diagnosed with needing the starter to be replaced. The vehicle was repaired. The …
Owner-reported narrative. Look up ODI 11519126 at NHTSA ↗