Chevrolet bulletin 662.20
Chevrolet filed this with NHTSA as a over-the-air update dated Aug 8, 2026, received Jun 26, 2026, about the unknown or other — 10 documents under this number. It names 10 model years (2024–2027). 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 successful vehicle software updates. • Improves how center display adjusts to lighting changes. • Improved warnings when a key is missing. • Better tuning for interior lighting in Stealth mode. Improvements to automatic low beam headlamp logic. • Smoother dimming and transitions from day to night. • Improvements to provide more accurate speed limit detection on the driver’s display. • Improvements to the availability of driver assistance features and fewer notifications or warnings. • Fixes to help ensure driver assistance features remain functional when the windshield freezes. • Fixes to help prevent loss of Performance Data Recorder functionality and to protect battery health. • The Transmission Fluid Life gauge will reset properly and show a more accurate reading. • The eAWD indicator will activate less frequently during normal driving conditions. • Fixes a known iPhone 15 charging issue that affects some devices
Documents filed under this number
| Document | Kind | Dated | NHTSA id |
|---|---|---|---|
| 662.20 | Over-the-air update | Aug 8, 2026 | 11036470 |
| 662.20 | Over-the-air update | Jul 30, 2026 | 11035446 |
| 662.20 | Over-the-air update | Jul 16, 2026 | 11035429 |
| 662.20 | Over-the-air update | Jul 16, 2026 | 11035391 |
| 662.20 | Over-the-air update | Jul 16, 2026 | 11035390 |
| 662.20 | Over-the-air update | Jul 14, 2026 | 11035444 |
| 662.20 | Over-the-air update | Jul 8, 2026 | 11035384 |
| 662.20 | Over-the-air update | Jul 8, 2026 | 11035377 |
| 662.20 | Over-the-air update | Jun 23, 2026 | 11034081 |
| 662.20 | Over-the-air update | Jun 19, 2026 | 11034073 |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5; the full text comes from the manufacturer or a dealer. 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. Quote it 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 662.20 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 662.20 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 662.20 cover?
The manufacturer filed it against 10 model years: 2027 Chevrolet Bolt, 2026 Chevrolet Corvette, 2024 Chevrolet Corvette, 2026 Chevrolet Equinox, 2025 Chevrolet Equinox, 2024 Chevrolet Equinox and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.