GM bulletin 24-NA-156
What it saysThis technical bulletin provides information and a procedure to correct the condition of Information on Dealer Installed Accessory Trailer Hitch Installation Concern. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Apr 30, 2025, received Sep 17, 2024, about the structure — 5 documents under this number. It names 2 model years across Chevrolet 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 · Cadillac.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis technical bulletin provides information and a procedure to correct the condition of Information on Dealer Installed Accessory Trailer Hitch Installation Concern.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 24-NA-156 | Service bulletin | Apr 30, 2025 | 11019744 | PDF, 152 KB |
| 24-NA-156 | Service bulletin | Feb 20, 2025 | 11015051 | PDF, 152 KB |
| 24-NA-156 | Service bulletin | Jan 29, 2025 | 11014082 | PDF, 136 KB |
| 24-NA-156 | Service bulletin | Sep 4, 2024 | 11008940 | PDF, 137 KB |
| 24-NA-156 | Service bulletin | Aug 16, 2024 | 11007836 | PDF, 136 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 85629520 | — | — | |
| 85511282 | — | — |
Read by machine from the document NHTSA serves (3 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.
Doing the repair yourself, or pricing it before the shop does? Search the part by fitment on eBay Motors — the listing and the price are the seller’s.
Find the body for the 2024 Equinox →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.
Model years it names
Source: as the manufacturer filed themChevrolet 1 model year
Cadillac 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 198 complaints with NHTSA since 2015. 1 of them name Structure — 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.
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 structure
Source: same model, same component group26 other manufacturer communications filed against these GM models under the same component group (structure), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| PIE0829A | Service bulletin | Jun 5, 2025 | This engineering information (EI) closure ends the need for gathering further information from technicians in regard to the liftgate not ope… |
| PIE0837 | Service bulletin | May 9, 2025 | This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engine… |
| PIT6364 | Service bulletin | Apr 3, 2025 | This Preliminary information communicates to the dealership/technician the repair direction needed to correct a condition that allows the fr… |
| PIE0822 | Service bulletin | Mar 21, 2025 | This EI (Lite) (Pictures ONLY) for Pre-Delivery Inspection (PDI) and Customer Vehicle Issues Up to 500 Miles. Dealers should use the CSMT Ap… |
| 19-NA-255 | Service bulletin | Mar 11, 2025 | This preliminary informational bulletin provides frame coating repair information to correct a customer concern of wax coating on frame peel… |
| 25-NA-022 | Service bulletin | Mar 7, 2025 | This technical bulletin provides a procedure to correct the condition of Driver Window Stuck or Intermittent Operation Concerns. |
| PIC6598 | Service bulletin | Mar 7, 2025 | This Preliminary information communicates to the technician a diagnostic tip for diagnosing a front door latch when it is not latching. |
| 25-NA-020 | Service bulletin | Mar 5, 2025 | This technical bulletin provides a procedure to correct the condition of Service Power Liftgate Message Displayed or Rear Liftgate Unable to… |
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 Cadillac, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM 24-NA-156 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 24-NA-156 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 24-NA-156 cover?
The manufacturer filed it against 2 model years across 2 brands (Chevrolet and Cadillac): 2025 Cadillac Optiq, 2024 Chevrolet Equinox. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.