GM bulletin PIC6629E
What it saysThis PI is to instruct dealer on diagnostic procedures that need to be completed prior to replacing a radio or IPC display NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated May 8, 2026, received May 13, 2026. It names 94 model years across Chevrolet, GMC, Buick and Cadillac (2022–2027). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
One page for every brand it was filed under. Each brand’s bulletins: Chevrolet · GMC · Buick · Cadillac.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationWhat it applies to, as the document itself states it — the build window in the manufacturer’s own words, read by machine from the PDF NHTSA serves. The build date is on the certification label in the driver’s door jamb; the dealer settles a borderline vehicle by its VIN.
This PI is to instruct dealer on diagnostic procedures that need to be completed prior to replacing a radio or IPC display
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PIC6629E | Service bulletin | May 8, 2026 | 11032624 | PDF, 248 KB |
What the document itself lists
Labour operations and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 3429852 | Radio reset | 0.5 hrs |
| 3481408 | Disconnect and reconnect the display Envision, Enclave Encore GX, Envista | 0.3 hrs |
Read by machine from the document NHTSA serves (11 pages), read Sep 29, 2026. A part number is shown only where it matches GM’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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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 themChevrolet 43 model years
and 3 more on this site: 2026 Chevrolet Trax, 2025 Chevrolet Trax, 2024 Chevrolet Trax.
GMC 29 model years
and 19 more on this site: 2023 GMC Hummer EV, 2026 GMC Sierra, 2025 GMC Sierra, 2024 GMC Sierra, 2023 GMC Sierra, 2022 GMC Sierra, 2026 GMC Sierra 2500HD, 2025 GMC Sierra 2500HD, 2024 GMC Sierra 2500HD, 2026 GMC Sierra 3500HD, 2025 GMC Sierra 3500HD, 2024 GMC Sierra 3500HD, 2026 GMC Terrain, 2025 GMC Terrain, 2026 GMC Yukon, 2025 GMC Yukon, 2024 GMC Yukon, 2023 GMC Yukon, 2022 GMC Yukon.
Also filed against model years this site has no page for: 2022 GMC Hummer EV Pickup; 2026 GMC Hummer EV Pickup.
Buick 11 model years
and 3 more on this site: 2026 Buick Envista, 2025 Buick Envista, 2024 Buick Envista.
Cadillac 11 model years
and 3 more on this site: 2026 Cadillac Vistiq, 2025 Cadillac XT4, 2024 Cadillac XT4.
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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What owners reported
Source: NHTSA complaint databaseOwners of the 92 model years this bulletin names have filed 8,820 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.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM PIC6629E a recall?
No. A service bulletin 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 PIC6629E repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every GM warranty extension on file lists the ones GM has filed.
Which vehicles does PIC6629E cover?
The manufacturer filed it against 94 model years across 4 brands (Chevrolet, GMC, Buick and Cadillac): 2026 Buick Enclave, 2025 Buick Enclave, 2026 Buick Encore, 2025 Buick Encore, 2024 Buick Encore, 2026 Buick Envision and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone. The document itself sets the build window: built before 6 Jun 2025 — the build date is on the certification label in the driver’s door jamb.