GM bulletin PIT6156B
What it saysThis Preliminary information communicates that a driver may experience a vibration during moderate to wide open throttle acceleration. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Aug 13, 2024, about the suspension. 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 that a driver may experience a vibration during moderate to wide open throttle acceleration. The dealer is advised that this condition is due to the extreme angles on the Z71/AT4 suspension causing a bind in the drive axles. The concern will be alleviated over time as the grease is distributed throughout the half shaft joints.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PIT6156B | Service bulletin | Aug 13, 2024 | 11006288 | PDF, 93 KB |
What the document itself lists
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 3086028 | Half Shaft Break-In | 1 hrs |
Read by machine from the document NHTSA serves (2 pages), read Sep 30, 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 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 205 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.
More bulletins about the suspension
Source: same model, same component group6 other manufacturer communications filed against these GM models under the same component group (suspension), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 05-03-07-009L | Service bulletin | Feb 25, 2025 | This service bulletin provides information on Wheel Alignment Specifications, Requirements and Recommendations for GM Vehicles. |
| 05-03-08-002J | Service bulletin | Aug 22, 2024 | This service bulletin provides information to dealership personnel on diagnosis and replacement of shock absorber and strut due to fluid lea… |
| 22-NA-239 | Service bulletin | Jul 27, 2024 | This technical bulletin provides a procedure to inspect and if need be, to remove the lower strut isolator to clean and scuff if the spring… |
| 15-00-89-004G | Service bulletin | Apr 26, 2024 | This service bulletin provides technicians with information to help identify the differences between what is considered a fluid leak, and wh… |
| PIT5214F | Service bulletin | Nov 14, 2023 | This Preliminary Information communication provides information to the technician about vehicles that have had multiple repair attempts that… |
| 03-00-91-001I | Service bulletin | Nov 6, 2023 | This service bulletin provides a vibration analysis worksheet the technician can use in conjunction with the appropriate Vibration Analysis… |
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 PIT6156B 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 PIT6156B 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 PIT6156B cover?
The manufacturer filed it against 2 model years across 2 brands (Chevrolet and GMC): 2024 Chevrolet Traverse, 2024 GMC Acadia. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.