GM bulletin PIT6457C
What it saysThis preliminary information is for technicians that may see DTCs that are history and should not perform any part replacements. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Sep 28, 2026, received Oct 5, 2026. It names 194 model years across Chevrolet, GMC, Buick and Cadillac (2023–2027). 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 communicationThis preliminary information is for technicians that may see DTCs that are history and should not perform any part replacements. They should follow the notes mentioned prior to anything being replaced.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PIT6457C | Service bulletin | Sep 28, 2026 | 11038136 | PDF, 108 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 themChevrolet 97 model years
and 25 more on this site: 2025 Chevrolet Silverado 3500HD, 2024 Chevrolet Silverado 3500HD, 2023 Chevrolet Silverado 3500HD, 2027 Chevrolet Suburban, 2026 Chevrolet Suburban, 2025 Chevrolet Suburban, 2024 Chevrolet Suburban, 2023 Chevrolet Suburban, 2027 Chevrolet Tahoe, 2026 Chevrolet Tahoe, 2025 Chevrolet Tahoe, 2024 Chevrolet Tahoe, 2023 Chevrolet Tahoe, 2026 Chevrolet Trailblazer, 2025 Chevrolet Trailblazer, 2024 Chevrolet Trailblazer, 2023 Chevrolet Trailblazer, 2027 Chevrolet Traverse, 2026 Chevrolet Traverse, 2025 Chevrolet Traverse, 2024 Chevrolet Traverse, 2023 Chevrolet Traverse, 2026 Chevrolet Trax, 2025 Chevrolet Trax, 2024 Chevrolet Trax.
Also filed against model years this site has no page for: 2024 Chevrolet 3500HD; 2023 Chevrolet 4500HD; 2023 Chevrolet 5500HD; 2023 Chevrolet 6500HD; 2024 Chevrolet Bolt EV; 2025 Chevrolet Brightdrop 400; 2026 Chevrolet Brightdrop 400; 2025 Chevrolet Brightdrop 600; 2026 Chevrolet Brightdrop 600; 2023 Chevrolet LOW Cab Forward 3500; 2024 Chevrolet LOW Cab Forward 3500; 2025 Chevrolet LOW Cab Forward 3500; 2026 Chevrolet LOW Cab Forward 3500; 2023 Chevrolet LOW Cab Forward 4500; 2024 Chevrolet LOW Cab Forward 4500; 2025 Chevrolet LOW Cab Forward 4500; 2026 Chevrolet LOW Cab Forward 4500; 2023 Chevrolet LOW Cab Forward 5500; 2024 Chevrolet LOW Cab Forward 5500; 2025 Chevrolet LOW Cab Forward 5500; 2026 Chevrolet LOW Cab Forward 5500; 2023 Chevrolet LOW Cab Forward 6500; 2024 Chevrolet LOW Cab Forward 6500; 2025 Chevrolet LOW Cab Forward 6500; 2026 Chevrolet LOW Cab Forward 6500; 2023 Chevrolet LOW Cab Forward 7500; 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; 2027 Chevrolet Trailblazer; 2023 Chevrolet Trax.
GMC 42 model years
and 30 more on this site: 2023 GMC Canyon, 2025 GMC Hummer EV, 2024 GMC Hummer EV, 2023 GMC Hummer EV, 2026 GMC Savana, 2025 GMC Savana, 2024 GMC Savana, 2023 GMC Savana, 2026 GMC Sierra, 2025 GMC Sierra, 2024 GMC Sierra, 2023 GMC Sierra, 2026 GMC Sierra 2500HD, 2025 GMC Sierra 2500HD, 2024 GMC Sierra 2500HD, 2023 GMC Sierra 2500HD, 2026 GMC Sierra 3500HD, 2025 GMC Sierra 3500HD, 2024 GMC Sierra 3500HD, 2023 GMC Sierra 3500HD, 2027 GMC Terrain, 2026 GMC Terrain, 2025 GMC Terrain, 2024 GMC Terrain, 2023 GMC Terrain, 2027 GMC Yukon, 2026 GMC Yukon, 2025 GMC Yukon, 2024 GMC Yukon, 2023 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; 2027 GMC Sierra EV.
Buick 17 model years
and 8 more on this site: 2023 Buick Encore, 2026 Buick Envision, 2025 Buick Envision, 2024 Buick Envision, 2023 Buick Envision, 2026 Buick Envista, 2025 Buick Envista, 2024 Buick Envista.
Also filed against model years this site has no page for: 2027 Buick Encore GX.
Cadillac 38 model years
and 27 more on this site: 2026 Cadillac Celestiq, 2025 Cadillac Celestiq, 2027 Cadillac Escalade, 2026 Cadillac Escalade, 2025 Cadillac Escalade, 2024 Cadillac Escalade, 2023 Cadillac Escalade, 2027 Cadillac Lyriq, 2026 Cadillac Lyriq, 2025 Cadillac Lyriq, 2024 Cadillac Lyriq, 2023 Cadillac Lyriq, 2027 Cadillac Optiq, 2026 Cadillac Optiq, 2025 Cadillac Optiq, 2027 Cadillac Vistiq, 2026 Cadillac Vistiq, 2025 Cadillac XT4, 2024 Cadillac XT4, 2023 Cadillac XT4, 2026 Cadillac XT5, 2025 Cadillac XT5, 2024 Cadillac XT5, 2023 Cadillac XT5, 2025 Cadillac XT6, 2024 Cadillac XT6, 2023 Cadillac XT6.
Also filed against model years this site has no page for: 2024 Cadillac Celestiq; 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 154 model years this bulletin names have filed 8,459 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 PIT6457C 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 PIT6457C 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 PIT6457C cover?
The manufacturer filed it against 194 model years across 4 brands (Chevrolet, GMC, Buick and Cadillac): 2027 Buick Enclave, 2026 Buick Enclave, 2025 Buick Enclave, 2024 Buick Enclave, 2023 Buick Enclave, 2026 Buick Encore and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.