Buick Enclave 2021–2022 — technical service bulletin
Bulletin N25-250552 · NHTSA communication 11028977 · issued Feb 5, 2026
Technical service bulletin
communication type
Unknown / Other
component
2021–2022
model years
37
vehicle entries
Official summary
Improvements to OnStar functionality. During the update process, your radio may stay on up to 5 minutes after you exit the vehicle. This is expected behavior when an update package is onboard the vehicle. Do not service your vehicle during installation.
Vehicles covered
- 2021 Buick Enclave
- 2022 Buick Enclave
- 2021 Buick Encore
- 2022 Buick Encore
- 2021 Cadillac XT4
- 2022 Cadillac XT4
- 2021 Cadillac XT5
- 2022 Cadillac XT5
- 2021 Cadillac XT6
- 2022 Cadillac XT6
- 2021 Chevrolet Blazer
- 2022 Chevrolet Blazer
- 2022 Chevrolet Bolt Euv
- 2021 Chevrolet Bolt EV
- 2022 Chevrolet Bolt EV
- 2021 Chevrolet Camaro
- 2022 Chevrolet Camaro
- 2021 Chevrolet Equinox
- 2022 Chevrolet Equinox
- 2021 Chevrolet Malibu
- 2022 Chevrolet Malibu
- 2021 Chevrolet Silverado 1500
- 2022 Chevrolet Silverado 1500
- 2021 Chevrolet Silverado 2500
- 2022 Chevrolet Silverado 2500
- 2021 Chevrolet Trailblazer
- 2022 Chevrolet Trailblazer
- 2021 Chevrolet Traverse
- 2022 Chevrolet Traverse
- 2021 GMC Acadia
- 2022 GMC Acadia
- 2021 GMC Sierra 1500
- 2022 GMC Sierra 1500
- 2021 GMC Sierra 2500
- 2022 GMC Sierra 2500
- 2021 GMC Terrain
- 2022 GMC Terrain
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.