GM bulletin PIT6123B
What it saysThis Preliminary information communicates on a software anomaly that causes a Rear Auto Brake and Park Assist Unavailable message on start up that is temporary and how to address that concern. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Mar 11, 2024, received Apr 15, 2024, about the back over prevention. It names 2 model years across Chevrolet and GMC (2024). 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.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis Preliminary information communicates on a software anomaly that causes a Rear Auto Brake and Park Assist Unavailable message on start up that is temporary and how to address that concern.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PIT6123B | Service bulletin | Mar 11, 2024 | 10253073 | not found |
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.
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Model years it names
Source: as the manufacturer filed themChevrolet 1 model year
GMC 1 model year
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 2 model years this bulletin names have filed 708 complaints with NHTSA since 2015.
After the latest update from the Dealer, the integrated trailer brake module no longer shows an output of how much power it's applying to the trailer brake system. It just stays blank. I can tell that the brakes actually are being applied, however not having indication of them being applied and how much pressure is applied is concerning
2024 GMC Sierra · Service Brakes · filed with NHTSA Jun 2, 2026
In August of 2025 I purchased a Chevy MD 5500 from Paul Masse, Inc., in RI. From the time of delivery the truck had a serious shake while operating. Paul Masse, Inc., told me that the tires had flat spots from sitting on the lot prior to purchase. As time went on the dealership placed two new sets of tires on the truck.
2024 Chevrolet Silverado · Service Brakes · filed with NHTSA Apr 18, 2026
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 back over prevention
Source: same model, same component group15 other manufacturer communications filed against these GM models under the same component group (back over prevention), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| PIT5907D | Service bulletin | Dec 11, 2024 | This Preliminary information communicates a issue where the park assist module can set current communication dtc's due to a timing issue and… |
| PIT5697D | Service bulletin | Dec 4, 2024 | This Preliminary information communication provides information to the technician on installing Regular Production Option Code UVC Rearview… |
| PIT6105B | Service bulletin | Mar 19, 2024 | This Preliminary information communicates to dealership technicians that they will need to perform this step prior to performing any program… |
| PIP5847B | Service bulletin | Nov 17, 2023 | This Preliminary information communicates the possibility of a misfire or rough running concern and abnormal engine noise due to excessive w… |
| N23-240353 | Service bulletin | Sep 5, 2023 | 'Your vehicle keeps getting better. This software update includes the following if your vehicle is equipped: Refinements: â¢Updates made… |
| PIT6047B | Service bulletin | Aug 17, 2023 | This Preliminary information communicates to dealership technicians to create a USB file that will have the radio ignore the BCM message for… |
| PIT6044A | Service bulletin | Aug 9, 2023 | This Preliminary information communicates that a Software update is in the works and to disconnect the 12 volt battery to clear the codes. |
| PIT6018C | Service bulletin | Aug 8, 2023 | This Preliminary information communicates the possibility of a resetting of some information modules prior to delivery. |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Chevrolet and GMC, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM PIT6123B 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 PIT6123B 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.
Which vehicles does PIT6123B cover?
The manufacturer filed it against 2 model years across 2 brands (Chevrolet and GMC): 2024 Chevrolet Silverado, 2024 GMC Sierra. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.