GM bulletin 24-NA-264
What it saysThis bulletin helps aid the tech in possible transmission noise that may be normal or abnormal depending on the concern noted. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Feb 13, 2025, received Dec 20, 2024, about the power train — 2 documents under this number. It names 53 model years across Chevrolet, GMC and Cadillac (2020–2025). 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 · GMC · Cadillac.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis bulletin helps aid the tech in possible transmission noise that may be normal or abnormal depending on the concern noted.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 24-NA-264 | Service bulletin | Feb 13, 2025 | 11014565 | PDF, 276 KB |
| 24-NA-264 | Service bulletin | Nov 27, 2024 | 11012009 | PDF, 274 KB |
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 23 model years
GMC 12 model years
Cadillac 18 model years
and 10 more on this site: 2023 Cadillac CT5, 2022 Cadillac CT5, 2021 Cadillac CT5, 2020 Cadillac CT5, 2025 Cadillac Escalade, 2024 Cadillac Escalade, 2023 Cadillac Escalade, 2022 Cadillac Escalade, 2021 Cadillac Escalade, 2020 Cadillac Escalade.
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 53 model years this bulletin names have filed 10,215 complaints with NHTSA since 2015. 2,252 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 2020 Chevrolet Silverado, the 50 owners who gave an odometer reading for Power Train reported it at a median of 61,200 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
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
I was driving and noticed a very strong smell of an electrical fire. The truck popped up a High Voltage Battery warning and several warning lights came on. We stopped, restarted the truck and the lights came on again, the smell returned as soon as we started driving. We drove the truck to Cable Dahmer GMC in Kansas City, MO.
2024 GMC Sierra · Power Train · filed with NHTSA May 11, 2026 · ODI 11737138
2025 CHEVROLET SUBURBAN HIGH COUNTRY. Vehicle is parked in my garage. Went out in the AM and the engine only cranks, will not start. Called On Star for roadside assistance. Sent a tow truck, the vehicle could not be towed due to the electronic transmission. There is no way for an owner to place the transmission in neutral.
2025 Chevrolet Suburban · Power Train · filed with NHTSA Apr 20, 2026 · ODI 11732473
In depth: 2024 Chevrolet Silverado transmission and drivetrain problems → · 2023 Chevrolet Silverado transmission and drivetrain problems → · 2022 Chevrolet Silverado transmission and drivetrain problems → · 2021 Chevrolet Silverado 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 group107 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 |
|---|---|---|---|
| N252502891-01 | Service campaign | Aug 20, 2026 | Certain vehicles may have a condition in which the internal differential nut was cross threaded or missing during assembly. Dealers will rev… |
| 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… |
| N242454441 -03 | Service campaign | Oct 9, 2025 | Certain vehicles listed above, may have a condition where the transmission control valve has worn, resulting in a gradual loss of pressure w… |
| 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… |
| N252494003-01 | Service campaign | Jun 26, 2025 | Certain vehicles listed above, may have a condition where the connecting rod and/or crankshaft engine components in these vehicles may have… |
| 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… |
| N242483540-01 | Service campaign | May 21, 2025 | Certain vehicles listed above may have a condition in which the transmission may not shift properly. Dealers are to replace the transmission… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Chevrolet, GMC and Cadillac, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM 24-NA-264 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-264 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-264 cover?
The manufacturer filed it against 53 model years across 3 brands (Chevrolet, GMC and Cadillac): 2025 Cadillac CT4, 2024 Cadillac CT4, 2023 Cadillac CT4, 2022 Cadillac CT4, 2021 Cadillac CT4, 2020 Cadillac CT4 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.