2020 GMC Sierra 1500 problems and complaints
Owners have filed 479 complaints with NHTSA about the 2020 GMC Sierra 1500. The most-reported areas: Engine (240), Power Train (98), Electrical System (81).
Key takeaways
- 479 owner complaints on file with NHTSA.
- 12 involve a crash, 5 a fire, 13 reported injuries.
- Complaints are unverified owner reports; recalls are confirmed defects.
| Component | Complaints | Share |
|---|---|---|
| Engine | 240 | 50% |
| Power Train | 98 | 20% |
| Electrical System | 81 | 17% |
| Service Brakes | 53 | 11% |
| Unknown Or Other | 44 | 9% |
| Steering | 37 | 8% |
| Fuel/Propulsion System | 26 | 5% |
| Engine And Engine Cooling | 21 | 4% |
| Suspension | 18 | 4% |
| Forward Collision Avoidance | 14 | 3% |
| Structure | 13 | 3% |
| Vehicle Speed Control | 12 | 3% |
One complaint can name several components, so shares add up to more than 100%.
| Version | Overall | Front | Side | Rollover |
|---|---|---|---|---|
| 2020 GMC Sierra 1500 PU/CC 4WD | 4/5 | 4/5 | 5/5 | 4/5 |
| 2020 GMC Sierra 1500 PU/EC 4WD | 5/5 | 4/5 | 5/5 | 4/5 |
| 2020 GMC Sierra 1500 PU/RC 4WD | 5/5 | 4/5 | 5/5 | 4/5 |
| 2020 GMC Sierra 1500 PU/CC 2WD | 4/5 | 4/5 | 5/5 | 4/5 |
Latest complaints, as filed
Owner-written and unverified by NHTSA.
Engine - filed 2026-10-15
Driving down road started to hear a weird growling knocking sound and noticed a reduction of power. also noticed lower then normal oil pressure. Changed oil found metal shavings in the oil. sent to chevy dealership. Diagnosed "rod bearing failure" needs new engine.
Visibility - filed 2026-10-14
The contact owns a 2020 GMC Sierra 1500. The contact noticed an abnormal odor inside the vehicle. Upon inspection, the contact observed that the roof, rear seats, and rear carpet were saturated with water. The vehicle was taken to the dealer, where the contact was informed that the rear sliding window frame connected t...
Engine And Engine Cooling - filed 2026-10-13
The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle suddenly entered Limp mode without warning. The vehicle was taken to the dealer, where the computer was reflashed and the vehicle temporarily returned to normal operation; however, the failure recurred an...
Diagnose it yourself
As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
More for the 2020 GMC Sierra 1500
Complaints are reports filed by owners with the National Highway Traffic Safety Administration. NHTSA publishes them without verifying them, and counts rise with how many cars were sold, so compare years of the same model rather than different models. Crash ratings are NHTSA's own 5-Star Safety Ratings results.