Over-the-air update 653.21
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.
| Type | Over-the-air update |
|---|---|
| NHTSA id | 11025914 |
| Published by NHTSA | 2025-12-02 |
| Manufacturer's number | 653.21 |
| Manufacturer's date | 2025-11-13 |
| Campaign id or software version | 653.21 |
| NHTSA component | UNKNOWN OR OTHER |
| Manufacturer's system | TCP: TCP (Telematics Communication Platform) |
NHTSA's summary
(There may be future updates under this same release number.) •Fixes to help prevent loss of functionality for OnStar, infotainment apps, and connectivity features. 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.
| CHEVROLET BRIGHTDROP 400 | 2025 (the catalog's model; the bulletin names a series or trim of it) |
|---|---|
| CHEVROLET BRIGHTDROP 600 | 2025 (the catalog's model; the bulletin names a series or trim of it) |
Listing a model year does not mean every vehicle of it is concerned: the document says which.