General Motors has issued a service update for certain vehicles that use its VIP and GEM architectures in order to reprogram the vehicles’ control modules.
The problem: certain 2020 and 2021 model year General Motors vehicles may have had multiple control modules dealer programmed using an incorrect Vehicle Identification Number that did not match the actual VIN of the vehicle, resulting in an incorrect VIN or an incorrect calibration file being programmed into the vehicle.
The hazards: if a vehicle receives an incorrect calibration file, certain control modules may not be calibrated properly. This can affect various important systems in the vehicle and prevent them from working as designed. It’s worth noting that General Motors has only issued a service update for affected vehicles and not a product safety recall, which is an indication that this issue likely poses no direct safety hazard to the driver or other vehicle occupants.
The fix: dealers will be instructed to follow the appropriate module programming event as it relates to the VIN. This will effectively reprogram the affected control modules and allow them to perform as originally intended.
Affected components: various control modules.
- 2021 Buick Envision
- 2020 Cadillac CT4
- 2020 Cadillac CT5
- 2020 Chevy Corvette
- 2021 Chevy Onix
- 2021 Chevy Suburban
- 2021 Chevy Tahoe
- 2021 GMC Yukon
- 2021 GMC Yukon XL
Number of affected vehicles: it is currently not clear how many vehicles received improper control module programming.
Next steps: owners can wait for General Motors to reach out to them to make an appointment with their dealership. This service update is for vehicles in dealership inventory and customer vehicles that return to the dealership for any reason in the future. Dealers and owners can reach out to Buick, Cadillac, Chevrolet or GMC directly using the contact information included below with any questions or concerns they may have. The service update was first issued in October 2021 and will expire at the end of the truck’s New Vehicle Limited Warranty Period.
- GM Service Update Number: N212344710
- Buick Customer Service: 1-877-248-2080
- Cadillac Customer Service: 1-877-248-2080
- Chevy Customer Service: 1-800-222-1020
- GMC Customer Service: 1-800-462-8782