General Motors has issued a customer satisfaction program (CSP) for the 2021 model-year Chevy Tahoe, Suburban, Cadillac Escalade, GMC Yukon and Yukon XL full-size SUVs over an issue related to the brake system control module (BSCM).
The problem: in affected vehicles, the BSCM may “set and latch an internal fault in the module’s onboard diagnostics (OBD) bugger.” If an over-the-air update (OTA) is pushed to an OBD module and the customer accepts it through the infotainment system, the update will fail because the presence of the active fault will block the OTA update. The customer may not notice that the OTA update has failed with an error message on the DIC, as this fault will not activate a warning light on the instrument panel and there will be no driver information center (DIC) message.
This fault is also not visible through dealer tools.
The hazards: this problem does not pose an immediate safety risk to the driver or vehicle occupants, although it is obviously ideal for a vehicle to be able to receive and properly install OTA updates.
The fix: dealers are instructed to reprogram the BSCM in affected vehicles. This will allow the vehicle to receive and properly install OTA updates.
Affected components: brake system control module (BSCM).
- 2021 Chevrolet Tahoe
- 2021 Chevrolet Suburban
- 2021 GMC Yukon
- 2021 GMC Yukon XL
- 2021 Cadillac Escalade
Next steps: GM will notify owners of affected vehicles and instruct them to make an appointment with their dealer. Owners who have questions regarding this technical service bulletin can use the contact information below to reach out to a Chevrolet, Cadillac or GMC customer service rep.
- GM CSP number: N202317390
- Chevrolet Customer Service: 1-800-222-1020
- GMC Customer Service: 1-800-462-8782
- Cadillac Customer Service: 1-800-333-4223
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