2021 GMC Sierra 2500 problems
The 2021 GMC Sierra 2500 has 66 complaints on file with NHTSA. The largest share (20%) concerns drivetrain & axles. Next are lighting (14%) and engine (12%).
At a glance
- Complaints
- 66 filed with NHTSA
- Most reported
- Drivetrain & axles 20% of complaints
- Crashes and fires
- 6 and 3
- Injuries and deaths
- 1 and 0
- Typical mileage
- 52,000 miles 18 complaints with mileage
Source: NHTSA owner complaints
Where the complaints are
Share of this model year's complaints by the part of the car involved. One complaint can name more than one part, so the shares can add up to more than 100%.
When problems show up
View the numbers
| Mileage | Complaints |
|---|---|
| 0k to 20k miles | 4 |
| 20k to 40k miles | 1 |
| 40k to 60k miles | 7 |
| 60k to 80k miles | 2 |
| 80k to 100k miles | 1 |
| 100k to 120k miles | 0 |
| 120k to 140k miles | 3 |
| 140k to 160k miles | 0 |
| 160k to 180k miles | 0 |
| 180k to 200k miles | 0 |
| 200k+ miles | 0 |
What the data shows
Of the 18 complaints that include odometer readings, half describe a problem before roughly 52,000 miles.
Safety-related details: 6 complaints mention a crash; 3 complaints mention a fire; 1 injury reported.
Looking only at complaints filed within five years of the model year (so older and newer years are comparable), the 2021 ranks 7th most-complained-about out of 26 model years of the GMC Sierra 2500 with enough data (66 complaints in that window). It is also covered by 6 safety recall campaigns.
What owners wrote
A few complaints as filed, shortened and with personal details removed. The first ones are among the most serious reports for this model year; the rest are typical.
The contact owns a 2021 GMC Sierra 2500. The contact stated that while driving at 50 MPH, the contact was pulling a trailer that he had loaded, and he drove around a curve, the gear shifted down independently, and the trailer pushed the vehicle off the right side, causing him to crash into a post and embankment. The contact mentioned he was able to shift the gear into Four Wheel Drive to get back on the road.
I purchased a 2021 GMC Denali 2500 in December 2023. A couple days after purchasing the vehicle I received a message on the dash saying the front camera was not working. I took the vehicle into the dealership where they said they reset the computer and nothing was wrong with the vehicle. One month later I was involved in a collision where a vehicle turned in front of my vehicle and the Automatic Emergency Braking failed to activate.
When I’m in reverse the up the cameras turn off. On one incident I was backing up and the camera turned off causing me to back up into the wall of my house
The contact owns a 2021 GMC Sierra 2500. The contact received Manufacturer's Recall Number: N232426400, for water intrusion into the electronic gate-release switch. The vehicle was repaired. The contact stated that six months after the vehicle was repaired, the tailgate failed to operate as intended. While at the residence, the taillights and headlights were flashing. The contact also became aware that the tailgate had unlatched independently while the vehicle was parked.
The contact owns a 2021 GMC Sierra 2500. The contact stated that on several occasions, the automatic power side-out step failed to extend as designed. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was 93,726.