Chevrolet bulletin 653.21
Chevrolet filed this with NHTSA as a over-the-air update dated Mar 14, 2026, received Dec 2, 2025, about the unknown or other — 2 documents under this number. It names 4 model years (2024–2025). A over-the-air update is not a safety recall — there is no NHTSA campaign number and no federal requirement — but it is usually work the manufacturer pays for on the vehicles it names; the dealer checks the VIN against the manufacturer’s list.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communication(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.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 653.21 | Over-the-air update | Mar 14, 2026 | 11030520 | not yet checked |
| 653.21 | Over-the-air update | Nov 13, 2025 | 11025914 | not yet checked |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themAlso filed against model years this site has no page for: 2025 Chevrolet Brightdrop 400; 2025 Chevrolet Brightdrop 600.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
Common questions
Source: NHTSA, 49 CFR 579.5Is Chevrolet 653.21 a recall?
No. A over-the-air update is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the 653.21 repair free?
A over-the-air update is usually paid by the manufacturer on the vehicles it names, within the terms and time limit the document sets; the dealer checks the VIN against the manufacturer’s list.
Which vehicles does 653.21 cover?
The manufacturer filed it against 4 model years: 2025 Chevrolet Traverse, 2024 Chevrolet Traverse, 2025 Chevrolet Brightdrop 400, 2025 Chevrolet Brightdrop 600. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.