GM bulletin 23-NA-208
What it saysThis bulletin provides a procedure to replace the rear axle to correct a customer concern of Growl/Howl Type Noise Coming from the Rear of the Vehicle. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Feb 12, 2024, received Dec 9, 2023, about the power train — 2 documents under this number. It names 2 model years across Chevrolet and GMC (2023). 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 bulletin provides a procedure to replace the rear axle to correct a customer concern of Growl/Howl Type Noise Coming from the Rear of the Vehicle.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 23-NA-208 | Service bulletin | Feb 12, 2024 | 10250723 | PDF, 83 KB |
| 23-NA-208 | Service bulletin | Nov 29, 2023 | 10246490 | PDF, 82 KB |
What the document itself lists
The manufacturer titles it “Growl/Howl Type Noise Coming from the Rear of the Vehicle”.
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 3088078 | Rear Axle Shaft Replacement for Noise | 2.5 hrs |
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.
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 200 complaints with NHTSA since 2015.
While slowly driving, like when parking or trying to park vehicle in garage, it will randomly surge when almost at complete stop forcing vehicle to lunge forward requiring operator to apply quick additional firm braking.
2023 GMC Canyon · Power Train · filed with NHTSA Jan 9, 2024 · ODI 11564448
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 power train
Source: same model, same component group42 other manufacturer communications filed against these GM models under the same component group (power train), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| N262556930-01 | Service campaign | Jun 17, 2026 | Certain vehicles may have a condition in which the transfer case drive chain sprocket is cracked. Dealers are to replace the transfer case. |
| N262556930 | Service campaign | Jun 2, 2026 | Certain vehicles may have a condition in which the transfer case drive chain sprocket is cracked. Dealers are to replace the transfer case. |
| N252517790 | Service campaign | Oct 14, 2025 | Certain vehicles, equipped with 8L80 or 8L90 Transmissions, may have a condition in which the reaction carrier cracks. Dealers are to replac… |
| PIE0824A | Service bulletin | May 10, 2025 | This engineering information (EI) closure ends the need for gathering further information from field in regard to fluid leaking at the outpu… |
| 24-NA-078 | Service bulletin | May 7, 2025 | This bulletin advises the tech to replace the starter and not the trans if grinding or growling is heard from the transmission area. |
| PIE0824 | Service bulletin | Mar 27, 2025 | This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer lis… |
| 23-NA-185 | Service bulletin | Mar 25, 2025 | This service bulletin helps diagnose/reduce possible CCND issues on Transfer Cases - Service 4WD on DIC, Intermittent Failures, Noise Concer… |
| PIP5966A | Service bulletin | Mar 2, 2025 | This Preliminary information communicates Diagnostic aids for a no start or DTC'S following a transmission replacement |
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 23-NA-208 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 23-NA-208 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 23-NA-208 cover?
The manufacturer filed it against 2 model years across 2 brands (Chevrolet and GMC): 2023 Chevrolet Colorado, 2023 GMC Canyon. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.