General Motors has released a service update to address an issue related to the transfer case thrust washer on certain examples of the 2021 model-year Chevy Silverado 1500 and GMC Sierra 1500 pickup trucks.
The problem: affected pickup trucks may have been delivered with a thrust washer that was improperly installed on the transfer case reduction carrier assembly at the factory.
The hazards: GM did not say what further problems a loose transfer case thrust washer could lead to. It is likely this problem poses no safety risk to the driver or vehicle occupants, however, as the problem is being addressed via service update and is not part of an official product safety recall.
The fix: dealers are instructed to replace the entire transfer case in affected trucks. This service update involves vehicles in dealership inventory only and no customer vehicles are believed to be affected.
Affected components: transfer case, transfer case thrust washer.
Number of affected vehicles: there are believed to be just seven vehicles in total affected by this problem, all of which are currently in dealership inventory.
Owners should: this service update is for vehicles in dealership inventory only. That means that buyers of the Chevy Silverado or GMC Sierra are not affected by this service update in any fashion. That said, dealers or concerned parties can reach out to Chevrolet or GMC directly using the contact information included below with any questions or concerns they may have. The service update will expire on July 31st, 2022.
- GM Service Update number: N212336800
- Chevrolet Customer Service: 1-800-222-1020
- GMC Customer Service: 1-800-462-8782