GM bulletin 24-NA-242
What it saysThis service bulletin advises the technician to verify the latest software to the radio before just replacing the torque converter for the customer concerns of Humming and/or Growling Noise, Transmission Shudder. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Jan 11, 2025, received Jan 24, 2025, about the power train. It names 2 model years across Chevrolet and Buick (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 · Buick.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis service bulletin advises the technician to verify the latest software to the radio before just replacing the torque converter for the customer concerns of Humming and/or Growling Noise, Transmission Shudder.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 24-NA-242 | Service bulletin | Jan 11, 2025 | 11013084 | PDF, 124 KB |
What the document itself lists
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 8486438 | Evaluate Vehicle for Torque Converter Replace | 0.3 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
Buick 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 239 complaints with NHTSA since 2015. 15 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.
Going at speeds 60-70, transmission slips and is jerky, pulsating symptoms. Unsure if transmission slipping or brake malfunction. Going at speeds lower, very hard gear shifts.
2024 Chevrolet Trax · Power Train · filed with NHTSA May 22, 2023 · ODI 11523150
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 group20 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 |
|---|---|---|---|
| 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… |
| 09-06-04-026Z | Service bulletin | Jan 9, 2025 | This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2. |
| 08-07-30-035I | Service bulletin | Nov 27, 2024 | This service bulletin provides information on the harmful effects of ethylene glycol in transmission fluid. |
| 04-06-01-029K | Service bulletin | Oct 28, 2024 | This informational bulletin explains Unscheduled Supplemental Services and the importance of GM Simplified Maintenance Schedules. |
| 24-NA-223 | Service bulletin | Oct 10, 2024 | This service bulletin informs the technician of an alternate lift procedure that has been developed when the lift plate does not fit the top… |
| 08-07-30-026I | Service bulletin | Sep 16, 2024 | This service bulletin provides information on some vehicles that may rock or move slightly forward or rearward while in Park at start up aft… |
| PIC6553A | Service bulletin | Aug 16, 2024 | This Preliminary information communicates the direction to take when a customer complains about a vibration when parking on a steep slope wi… |
| PIP5978 | Service bulletin | Aug 12, 2024 | This Preliminary information communicates the possibility of dtc p0299 setting as a result of the vacuum supply line from the vacuum pump 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 Buick, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM 24-NA-242 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-242 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 24-NA-242 cover?
The manufacturer filed it against 2 model years across 2 brands (Chevrolet and Buick): 2024 Buick Envista, 2024 Chevrolet Trax. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.