2020 GMC Sierra 2500HD Software recall 26V083000
Safety recall
Symptoms / what can happen
Rear wheel lock up increases the risk of a crash.
Cause
General Motors, LLC is recalling certain 2020 Chevrolet Silverado 2500, 3500, GMC Sierra 2500, 3500, and 2020-2022 Chevrolet Silverado 1500 and GMC Sierra 1500 vehicles that may have been repaired incorrectly under recall 24V797. The transmission control valve may fail and cause the rear wheels to lock up.
The fix, in plain English
Safety recall work is done free by a franchised dealer. Official remedy: Dealers will inspect the vehicles and update the transmission control software, free of charge. Owner notification letters were mailed March 6, 2026. Owners may contact GMC customer service at 1-800-462-8782 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N252516560. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on February 12, 2026.
Difficulty
Not DIY: recall remedies are performed by a franchised dealer.
Cost
Free to the owner at a dealer while the recall applies. Outside the recall, costs vary; get a written quote.
Typical parts (search links, no affiliate codes)
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