General Motors is issuing a follow-up recall for a select number of heavy-duty and light-duty trucks that were previously serviced for a terrifying rear-wheel lock-up defect.

According to newly released NHTSA documents, 1,055 vehicles may have received an incorrect software version during their initial recall repair. This specific campaign, NHTSA Recall Number 26V083, exclusively targets vehicles equipped with diesel engines that were serviced by dealerships during a six-day window between December 2, 2024, and December 8, 2024. Vehicles equipped with gas engines use a different transmission and are not affected by this recall.

A black 2021 Chevrolet Silverado 1500 diesel truck towing a boat on a trailer, representing the light-duty half-ton vehicles affected by the GM transmission software recall.
It isn’t just the heavy-duty rigs. Select 2020-2022 Chevrolet Silverado 1500 and GMC Sierra 1500 diesel models are also targeted in this “do-over” transmission software recall.

If you follow our Chevrolet and GMC coverage, you know this has been a massive, ongoing issue for the automaker. We originally broke the news on the massive truck and SUV recall for rear-wheel lock-up, detailed GM’s special coverage program, and even shared a terrifying dashcam video of a GMC Sierra HD locking up while hauling a fifth-wheel.

What Went Wrong With The First Repair?

The original remedy (Recall 24V797) involved a transmission control module (TCM) software update. The transmission control valve in these trucks can suffer from excessive wear, gradually losing pressure and causing harsh shifting, or in rare cases, a sudden rear-wheel lock-up.

The correct software update is designed to monitor the valve and detect this wear approximately 10,000 miles before a lock-up can occur. If wear is detected, the software prevents a lock-up by limiting the transmission to fifth gear until the next key cycle, accompanied by a service engine light and a “reduced propulsion” warning on the dash.

However, GM discovered an issue with its Global Warranty Management (GWM) system. Dealers were presented with an option to mark a vehicle as completely remedied without first verifying that the most recent, correct software version was actually available or installed. GM has since removed this option from their system to prevent further errors.

Screenshot of the official NHTSA Part 573 Safety Recall Report for campaign 26V083, showing General Motors recall number N252516560 affecting 1,055 vehicles.
Official NHTSA documentation confirms that exactly 1,055 GM trucks are affected by this secondary “do-over” software recall

Affected Vehicles

This secondary recall is highly specific, limited only to diesel models serviced during that specific week in early December 2024. The affected models include:

The Remedy and Next Steps

Dealers will inspect the affected vehicles to see if the incorrect software was applied and, if necessary, flash the system with the proper update completely free of charge.

Owner notification letters are expected to be mailed out starting March 30, 2026. Concerned owners can reach out to GMC customer service at 1-800-462-8782 or Chevrolet customer service at 1-800-222-1020 and reference GM’s recall number: N252516560.

Are you impacted by this “do-over” software update? Join the discussion with other owners in our Momentary Rear Wheel Lockup Recall forum thread.