Home · 2021 GMC Sierra 2500 Hd · Complaints
These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.
5 of 49 complaints match · Body & structure · clear filters
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.
NHTSA ODI 11733416
My tailgate unexpectedly open as I was driving down the road. (2021 GMC 2500 Denali Sierra) This was the second time this has happened and lost things driving down the road. (3 propane tanks and a small grill the first and then an air compressor the second time) Both times it happened I opened and closed the tailgate with the vehicle running. Both times I was unaware of tailgate opening and did not notice until I got home. The first time it happened I thought it was operator error but after this weekend, I looked into this and see there was a recall on it this month. I still felt it was necessary to report incidents.
NHTSA ODI 11579498
The tailgate latch is not waterproof, and opens on its own sometimes. this can allow things to fall out of your truck.
NHTSA ODI 11568867
Hit in the driver side tire, air bags didn’t release. Truck then went up in flames.
NHTSA ODI 11478289
when driving down the rode the center hood scoop blew off 0
NHTSA ODI 11477615
Working with the data? Download all 49 complaints as CSV · fetched from NHTSA July 19, 2026