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What 73 owners told NHTSA about the 2020 GMC Sierra 2500 Hd

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.

All (73)Crash / fire / injury (4)Transmission & drivetrain (22)Brakes (12)Electrical system (12)Engine (10)Steering (6)Body & structure (5)Driver assistance (4)Speed control (3)Engine & cooling (2)Lights (2)

2 of 73 complaints match · Body & structure · crash/fire/injury only · clear filters

Nov 24, 2025Electrical systemBody & structureVisibility & wipersFire

The rear defroster massively overheated. It started heavily smoking and eventually exploded the rear windows. Only warning sign was the smoke which we noticed quickly because the windows were up. Had the windows been down we might not have noticed before a fire started. I'm taking it to a dealership now. This module also triggers on from a remote start. Extremely dangerous!!!

NHTSA ODI 11701143

Mar 2, 2025Electrical systemBody & structureBackup camera & sensorsFire

Vehicle was parked in a school parking lot. Rear Trailer Harness and modules in back short circuited causing an electrical fire that expanded to the driver’s taillight rear bumper, and bed of truck.

NHTSA ODI 11645862

Working with the data? Download all 73 complaints as CSV · fetched from NHTSA July 19, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2020 GMC Sierra 2500 Hd verdict →