GM bulletin PIT6503
What it saysThis preliminary information is to inform technicians that GM is placing the B174W Front View Camera Module (ACP2) on part restriction due to elevated replacement rates and ongoing engineering investigation. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Apr 14, 2026, received Apr 23, 2026. It names 131 model years across Chevrolet, GMC, Buick and Cadillac (2024–2026). 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 communicationThis preliminary information is to inform technicians that GM is placing the B174W Front View Camera Module (ACP2) on part restriction due to elevated replacement rates and ongoing engineering investigation. Technicians must not replace the front camera module unless they have: 1.Completed the diagnostic procedure in this PI, and 2.Contacted TAC and received authorization, including the SI document number and specific step that directs camera replacement.
Trouble codes it names: B1A05 B1A1D P0562 U0131 U0235 U0499 U1126 U1127 U1610 U1611 U1615 U1616 U1643 U197A U3000 all 15 read from the document itself; NHTSA’s summary names none
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PIT6503 | Service bulletin | Apr 14, 2026 | 11031514 | PDF, 148 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 86535062 | Camera | — | eBay Motors → |
| 85063357 | Camera | — | eBay Motors → |
| 85870485 | Camera | — | eBay Motors → |
| 85673847 | Camera | — | eBay Motors → |
Read by machine from the document NHTSA serves (7 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.
Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
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 64 model years
and 2 more on this site: 2025 Chevrolet Trax, 2024 Chevrolet Trax.
Also filed against model years this site has no page for: 2024 Chevrolet 3500HD; 2024 Chevrolet Bolt EV; 2025 Chevrolet Brightdrop 400; 2026 Chevrolet Brightdrop 400; 2025 Chevrolet Brightdrop 600; 2026 Chevrolet Brightdrop 600; 2024 Chevrolet LOW Cab Forward 3500; 2025 Chevrolet LOW Cab Forward 3500; 2026 Chevrolet LOW Cab Forward 3500; 2024 Chevrolet LOW Cab Forward 4500; 2025 Chevrolet LOW Cab Forward 4500; 2026 Chevrolet LOW Cab Forward 4500; 2024 Chevrolet LOW Cab Forward 5500; 2025 Chevrolet LOW Cab Forward 5500; 2026 Chevrolet LOW Cab Forward 5500; 2024 Chevrolet LOW Cab Forward 6500; 2025 Chevrolet LOW Cab Forward 6500; 2026 Chevrolet LOW Cab Forward 6500; 2024 Chevrolet LOW Cab Forward 7500; 2025 Chevrolet LOW Cab Forward 7500; 2026 Chevrolet LOW Cab Forward 7500; 2025 Chevrolet LOW Cab Forward N Series.
GMC 29 model years
and 18 more on this site: 2026 GMC Savana, 2025 GMC Savana, 2024 GMC Savana, 2026 GMC Sierra, 2025 GMC Sierra, 2024 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, 2024 GMC Terrain, 2026 GMC Yukon, 2025 GMC Yukon, 2024 GMC Yukon.
Also filed against model years this site has no page for: 2024 GMC 3500HD; 2026 GMC Hummer EV Pickup; 2026 GMC Hummer EV SUV.
Buick 12 model years
and 4 more on this site: 2024 Buick Envision, 2026 Buick Envista, 2025 Buick Envista, 2024 Buick Envista.
Cadillac 26 model years
and 16 more on this site: 2026 Cadillac Escalade, 2025 Cadillac Escalade, 2024 Cadillac Escalade, 2026 Cadillac Lyriq, 2025 Cadillac Lyriq, 2024 Cadillac Lyriq, 2026 Cadillac Optiq, 2025 Cadillac Optiq, 2026 Cadillac Vistiq, 2025 Cadillac XT4, 2024 Cadillac XT4, 2026 Cadillac XT5, 2025 Cadillac XT5, 2024 Cadillac XT5, 2025 Cadillac XT6, 2024 Cadillac XT6.
Also filed against model years this site has no page for: 2026 Cadillac XT4; 2026 Cadillac XT6.
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 104 model years this bulletin names have filed 5,394 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 PIT6503 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 PIT6503 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 PIT6503 cover?
The manufacturer filed it against 131 model years across 4 brands (Chevrolet, GMC, Buick and Cadillac): 2026 Buick Enclave, 2025 Buick Enclave, 2024 Buick Enclave, 2026 Buick Encore, 2025 Buick Encore, 2024 Buick Encore and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.