GM bulletin PIT6346
What it saysThis Preliminary information communicates that a vehicle may come to the dealer with a service high voltage message. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Feb 24, 2025, received Mar 2, 2025, about the fuel/propulsion system. It names 12 model years across Chevrolet, GMC and Cadillac (2024–2025). 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 · Cadillac.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis Preliminary information communicates that a vehicle may come to the dealer with a service high voltage message. The dealer is instructed to check for code B2BAA and if it is found to reprogram the Battery Energy Control Module.
Trouble codes it names: B2BAA
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PIT6346 | Service bulletin | Feb 24, 2025 | 11014617 | PDF, 29 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 6 model years
GMC 4 model years
Cadillac 2 model years
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 12 model years this bulletin names have filed 1,916 complaints with NHTSA since 2015. 94 of them name Fuel/Propulsion System — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
My car is equipped with a forward-facing camera, mounted on the forward area of the interior rearview mirror. Additional cameras are mounted on the front bumper, trunk door, and on the rearview mirrors on each side of the car. Various sensors mounted throughout both bumpers face the front, rear, and each side of the car.
2025 Cadillac Lyriq · Fuel/Propulsion System · filed with NHTSA Feb 9, 2026 · ODI 11716618
On , about 400 miles into our trip heading South on , the Engine Reduced Power Warning came on. We were in the fast lane traveling at 70 MPH,the car immediately slowed to about 30 mph. There was no prior warning or check engine light. Vehicles behind us had to swerved and change lanes to avoid hitting us.
2024 Chevrolet Equinox · Fuel/Propulsion System · filed with NHTSA Jul 8, 2025 · ODI 11672055
While driving on a public road, the vehicle suddenly shut down and rebooted itself. Motive power was lost during the event. This has happened at least a dozen times during normal driving, including while transporting a child. Video of an occurrence was recorded.
2025 GMC Hummer EV · Fuel/Propulsion System · filed with NHTSA Aug 27, 2026 · ODI 11759966
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.
More bulletins about the fuel/propulsion system
Source: same model, same component group65 other manufacturer communications filed against these GM models under the same component group (fuel/propulsion system), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| N262558690-02 | Service campaign | Sep 23, 2026 | General Motors has decided to conduct a Voluntary Emission Recall. Certain vehicles may have a condition which can cause the fuel pump power… |
| N262558690 | Service campaign | Sep 16, 2026 | General Motors has decided to conduct a Voluntary Emission Recall. Certain vehicles may have a condition which can cause the fuel pump power… |
| N242452131-02 | Emissions | Sep 11, 2026 | Emission Recall. General Motors has decided to conduct a Voluntary Emission Recall involving certain 2023-2024 model year Chevrolet Colorad… |
| N262558690-01 | Service campaign | Sep 1, 2026 | Emission Recall. General Motors has decided to conduct a Voluntary Emission Recall. Certain vehicles listed above may have a condition whic… |
| N242452130-01 | Service campaign | Aug 4, 2026 | Certain vehicles may have a condition in which the Engine Control Module (ECM) does not sufficiently control fuel injector flow rate under c… |
| 661.40 | Over-the-air update | May 27, 2026 | • Surround Vision Recorder, a new feature that allows you to record, watch, and save video from your vehicle's cameras • Security Recording… |
| N252516900-01 | Emissions | Feb 19, 2026 | Emission Recall. General Motors has decided to conduct a Voluntary Emission Recall. Certain vehicles listed above may have a condition whi… |
| N252516900 | Emissions | Feb 5, 2026 | Emission Recall. General Motors has decided to conduct a Voluntary Emission Recall. Certain vehicles listed above may have a condition whi… |
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 and Cadillac, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM PIT6346 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 PIT6346 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 PIT6346 cover?
The manufacturer filed it against 12 model years across 3 brands (Chevrolet, GMC and Cadillac): 2025 Cadillac Lyriq, 2024 Cadillac Lyriq, 2025 Chevrolet Blazer, 2024 Chevrolet Blazer, 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.