GM bulletin 23-NA-172
What it saysThis service bulletin advises the technician to replace the transmission and not overhaul it to correct a customer concern of Manual Transmission Pops/Jumps Out of Third Gear After Shifting and During Acceleration. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Oct 6, 2023, received Oct 17, 2023, about the power train — 2 documents under this number. It names 13 model years across Chevrolet and Cadillac (2016–2024). 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 · Cadillac.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationWhat it applies to, as the document itself states it — the build window in the manufacturer’s own words, read by machine from the PDF NHTSA serves. The build date is on the certification label in the driver’s door jamb; the dealer settles a borderline vehicle by its VIN.
this service bulletin advises the technician to replace the transmission and not overhaul it to correct a customer concern of Manual Transmission Pops/Jumps Out of Third Gear After Shifting and During Acceleration.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 23-NA-172 | Service bulletin | Oct 6, 2023 | 10244284 | PDF, 93 KB |
| 23-NA-172 | Service bulletin | Sep 22, 2023 | 10244181 | PDF, 93 KB |
What the document itself lists
The manufacturer titles it “Manual Transmission Pops/Jumps Out of Third Gear After Shifting and During”.
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 24045453 | TUET18148 | — | |
| 24044484 | TUET18091 | — | |
| 92246731 | TUET10860 | — | |
| 24298784 | TUET17530 | — | |
| 24298783 | TUET17529 | — | |
| 24298781 | TUET17527 | — | |
| 24298780 | TUET1726 | — | |
| 24252997 | TUET10315 | — | |
| 24264050 | TUET12009 | — | |
| 24264056 | TUET12010 | — | |
| 19418486 | TUET17510 | — |
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 8486348 | Manual Transmission Inspection All | 0.4 hrs |
Read by machine from the document NHTSA serves (4 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 9 model years
Cadillac 4 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 13 model years this bulletin names have filed 570 complaints with NHTSA since 2015. 168 of them name Power Train — 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.
On the 2016 Chevrolet Camaro, the 30 owners who gave an odometer reading for Power Train reported it at a median of 20,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
I bought my car in sept. 2016 after the first couple of months at random times the transmission makes a boom sound when slowing down from speeds over 55 MPH or during acceleration from stop and go rush hour traffic it's as if the transmission has to catch up with the accelerator. I get monthly diagnostics and nothing shows up as an issue
2016 Chevrolet Camaro · Power Train · filed with NHTSA Mar 19, 2018 · ODI 11080158
On or about november 26, 2020, at 1:30 AM while driving on I-30 westbound in texarkana, tx traveling at the posted speed of 75 MPH in a 2018 Camaro zl1. The transmission blew out while in cruise control and all systems that transmit power from the engine or propulsion device to the wheels were lost and the vehicle had to coast onto the…
2018 Chevrolet Camaro · Power Train · filed with NHTSA Nov 29, 2020 · ODI 11376919
The contact owns a 2020 Chevrolet Camaro. The contact stated while shifting into gears to pull out of a parking space, the vehicle failed to respond. The vehicle was taken to an unknown dealer, where the TCM was replaced. Additionally, the contact stated that while reversing out of a parking space, the vehicle accelerated unintendedly.
2020 Chevrolet Camaro · Power Train · filed with NHTSA May 14, 2025 · ODI 11660923
In depth: 2017 Chevrolet Camaro transmission and drivetrain problems →
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 group50 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 |
|---|---|---|---|
| 25-NA-080 | Service bulletin | Sep 4, 2025 | This service bulletin provides a procedure to overhaul the control valve to replace a plate and worn down check ball to correct the customer… |
| N242480631-02 | Service campaign | May 27, 2025 | Certain vehicles listed above, may have a condition where the transmission control valve has worn, resulting in a gradual loss of pressure w… |
| N242480631-01 | Service campaign | May 22, 2025 | Certain vehicles listed above, may have a condition where the transmission control valve has worn, resulting in a gradual loss of pressure w… |
| N242480631 | Service campaign | Mar 7, 2025 | Certain vehicles listed above, may have a condition where the transmission control valve has worn, resulting in a gradual loss of pressure w… |
| PIP5966A | Service bulletin | Mar 2, 2025 | This Preliminary information communicates Diagnostic aids for a no start or DTC'S following a transmission replacement |
| 24-NA-264 | Service bulletin | Feb 13, 2025 | This bulletin helps aid the tech in possible transmission noise that may be normal or abnormal depending on the concern noted. |
| 16-NA-019 | Service bulletin | Feb 12, 2025 | This informational buleltin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flare… |
| PIC6454A | Service bulletin | Jan 10, 2025 | This Preliminary Information communicates additional information to the customer on the "No Lift Shift" feature found on all Manual Transmis… |
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 23-NA-172 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-172 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-172 cover?
The manufacturer filed it against 13 model years across 2 brands (Chevrolet and Cadillac): 2024 Cadillac CT4, 2023 Cadillac CT4, 2022 Cadillac CT4, 2024 Cadillac CT5, 2024 Chevrolet Camaro, 2023 Chevrolet Camaro and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone. The document itself sets the build window: 5453 TUET18148: built 19 Dec 2022 – 9 Jan 2023; 4484 TUET18091: built 15 Dec 2022 – 4 Jan 2023; 8784 TUET17530: built 21 Dec 2022 – 9 Jan 2023 — the build date is on the certification label in the driver’s door jamb.