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Over-the-air update N25-250552

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeOver-the-air update
NHTSA id11028977
Published by NHTSA2026-02-24
Manufacturer's numberN25-250552
Manufacturer's date2026-02-05
Campaign id or software versionN25-250552
NHTSA componentUNKNOWN OR OTHER
Manufacturer's systemTCP: TCP (Telematics Connectivity Platform) OnStar

NHTSA's 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.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Vehicles listed
BUICK ENCLAVE2021, 2022
BUICK ENCORE2021, 2022
CADILLAC XT42021, 2022
CADILLAC XT52021, 2022
CADILLAC XT62021, 2022
CHEVROLET BLAZER2021, 2022
CHEVROLET BOLT EUV2022
CHEVROLET BOLT EV2021, 2022
CHEVROLET CAMARO2021, 2022
CHEVROLET EQUINOX2021, 2022
CHEVROLET MALIBU2021, 2022
CHEVROLET SILVERADO 15002021, 2022 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SILVERADO 25002021, 2022 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET TRAILBLAZER2021, 2022
CHEVROLET TRAVERSE2021, 2022
GMC ACADIA2021, 2022
GMC SIERRA 15002021, 2022 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 25002021, 2022 (the catalog's model; the bulletin names a series or trim of it)
GMC TERRAIN2021, 2022

Listing a model year does not mean every vehicle of it is concerned: the document says which.