Chevrolet bulletin 662.21
Chevrolet filed this with NHTSA as a over-the-air update dated Aug 5, 2026, received Aug 1, 2026, about the unknown or other — 4 documents under this number. It names 4 model years (2025–2026). 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• Fixes to help ensure proper functionality for heating and cooling features. • Improvements to night mode lights for shifting gears. • Fixes for Daytime Running Lamps turning on when set to Off. • Fixes to help prevent erroneous missing key messages on driver display. • Fixes for accuracy of low tire pressure alert. • Fixes for speed threshold for pedestrian alerts. • Improvements to start reliability and reduced check engine light activation • Improvements to turbo system diagnostics • Improvements to reliability when extending the running boards on your vehicle • Improves transmission diagnostic software. • Reduces unnecessary check engine light activations. • Fixes to help extend coolant valve life through diagnostic changes
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 662.21 | Over-the-air update | Aug 5, 2026 | 11036471 | PDF, 198 KB |
| 662.21 | Over-the-air update | Jul 30, 2026 | 11035451 | PDF, 185 KB |
| 662.21 | Over-the-air update | Jul 15, 2026 | 11035443 | PDF, 188 KB |
| 662.21 | Over-the-air update | Jul 14, 2026 | 11035456 | PDF, 186 KB |
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 themA 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 662.21 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 662.21 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 662.21 cover?
The manufacturer filed it against 4 model years: 2026 Chevrolet Colorado, 2026 Chevrolet Silverado, 2025 Chevrolet Silverado, 2026 Chevrolet Silverado 2500HD. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.