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Federal filingsHome›Bulletins›Chevrolet› 662.30
Manufacturer communication · Over-the-air update · 4 brands

GM over-the-air update 662.30

What it saysFixes to help ensure successful vehicle software updates. NHTSA’s full summary ↓

GM filed this with NHTSA as an over-the-air update dated Aug 31, 2026, received Jun 25, 2026 — 23 documents under this number. It names 36 model years across Chevrolet, GMC, Buick and Cadillac (2024–2026). An 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.

One page for every brand it was filed under. Each brand’s bulletins: Chevrolet · GMC · Buick · Cadillac.

2026 Chevrolet Corvette: every bulletin →The document at NHTSA (PDF) →

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What the bulletin says

Source: NHTSA's summary of the manufacturer's communication

• Fixes to help ensure successful vehicle software updates. • The active cabin ventilation feature will operate more reliably. • Additional protection for the health of your battery and updates to help prevent excessive battery drain and overheating. • 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

Manufacturer campaign id 662.30 Kind Over-the-air update Manufacturer date Aug 31, 2026 Received by NHTSA Jun 25, 2026 Components — First dated Jun 7, 2026

Documents filed under this number

DocumentKindDatedNHTSA idAt NHTSA
662.30Over-the-air updateAug 31, 202611036483PDF, 193 KB
662.30Over-the-air updateAug 24, 202611036482PDF, 194 KB
662.30Over-the-air updateAug 19, 202611036468PDF, 187 KB
662.30Over-the-air updateJul 21, 202611035453PDF, 198 KB
662.30Over-the-air updateJul 20, 202611035389PDF, 196 KB
662.30Over-the-air updateJul 20, 202611035358PDF, 192 KB
662.30Over-the-air updateJul 16, 202611035445PDF, 189 KB
662.30Over-the-air updateJul 16, 202611035432PDF, 188 KB
662.30Over-the-air updateJul 16, 202611035294PDF, 188 KB
662.30Over-the-air updateJul 15, 202611036500PDF, 195 KB
662.30Over-the-air updateJul 15, 202611035387PDF, 196 KB
662.30Over-the-air updateJul 15, 202611035386PDF, 195 KB
662.30Over-the-air updateJul 14, 202611035426PDF, 193 KB
662.30Over-the-air updateJul 14, 202611035424PDF, 193 KB
662.30Over-the-air updateJul 13, 202611036502PDF, 204 KB
662.30Over-the-air updateJul 13, 202611035299PDF, 193 KB
662.30Over-the-air updateJun 25, 202611034070PDF, 187 KB
662.30Over-the-air updateJun 25, 202611034069PDF, 193 KB
662.30Over-the-air updateJun 24, 202611034071PDF, 202 KB
662.30Over-the-air updateJun 23, 202611034077PDF, 193 KB
662.30Over-the-air updateJun 22, 202611034936PDF, 190 KB
662.30Over-the-air updateJun 16, 202611034056PDF, 189 KB
662.30Over-the-air updateJun 7, 202611034080PDF, 189 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 them

Chevrolet 13 model years

2026 Chevrolet Corvette2025 Chevrolet Corvette2024 Chevrolet Corvette2026 Chevrolet Equinox2025 Chevrolet Equinox2026 Chevrolet Silverado2025 Chevrolet Silverado2024 Chevrolet Silverado2025 Chevrolet Silverado 2500HD2025 Chevrolet Suburban2025 Chevrolet Tahoe2025 Chevrolet Traverse2024 Chevrolet Traverse

GMC 12 model years

2025 GMC Acadia2024 GMC Acadia2025 GMC Hummer EV2024 GMC Hummer EV2026 GMC Sierra2025 GMC Sierra2024 GMC Sierra2025 GMC Sierra 2500HD2025 GMC Terrain2025 GMC Yukon

Also filed against model years this site has no page for: 2026 GMC Hummer EV Pickup; 2026 GMC Hummer EV SUV.

Buick 3 model years

2025 Buick Enclave2024 Buick Enclave2026 Buick Envision

Cadillac 8 model years

2026 Cadillac CT42025 Cadillac CT42026 Cadillac CT52025 Cadillac CT52026 Cadillac Escalade2025 Cadillac Escalade2026 Cadillac Optiq2026 Cadillac Vistiq

A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.

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A weekly email, sent only in a week when GM files something new with NHTSA for the model you pick — service bulletins, campaigns, warranty extensions, over-the-air notices, every model year. Nothing else is sent; one-click unsubscribe in every message. Separate from recall alerts.

What owners reported

Source: NHTSA complaint database

Owners of the 34 model years this bulletin names have filed 2,728 complaints with NHTSA since 2015.

A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.

Quote the number at the service desk. It is what the dealer’s system is keyed on.

Every manufacturer communication NHTSA holds for Chevrolet, GMC, Buick and Cadillac, by the number printed on the letter.

Every Chevrolet bulletin →Look up another number
Photo: Christian Buehner / Unsplash

Common questions

Source: NHTSA, 49 CFR 579.5

Is GM 662.30 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 662.30 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 662.30 cover?

The manufacturer filed it against 36 model years across 4 brands (Chevrolet, GMC, Buick and Cadillac): 2025 Buick Enclave, 2024 Buick Enclave, 2026 Buick Envision, 2026 Cadillac CT4, 2025 Cadillac CT4, 2026 Cadillac CT5 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.

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