General Motors has issued a Service Update to address a problem regarding the brake system control module calibration on a very small number of 2021 Chevy Tahoe models.
The problem: in affected vehicles, the brake system control module (BSCM) was reprogrammed by a dealership technician using a VIN that did not match the VIN of the vehicle. This resulted in the vehicles receiving the incorrect calibration file for the BSCM.
The hazards: GM has not said what kind of hazards this problem may cause. It seems possible that vehicles with the wrong brake system calibration could experience a reduction in braking performance or other braking-related issues, however. Dealers have been instructed to update the BSCM in all affected vehicles still in their inventory, as well as all affected customer vehicles that return to the dealer for any reason.
The fix: GM will reprogram the BSCM. These repairs will be performed at no cost to the vehicle owner.
Affected components: BSCM software.
Number of affected vehicles: only three 2021 Chevy Tahoe models are affected by this problem in total.
Owners should: customers affected by this Service Update can wait for GM to reach out to them, at which point they will be instructed to make an appointment with their dealership for repairs. The service update will not expire until the end of the involved vehicle’s New Vehicle Limited Warranty period. Owners of affected vehicles can also reach out to GM directly with any questions or concerns they may have using the contact information included below.
- GM Service Update number: N212340971
- Chevrolet Customer Service: 1-800-222-1020