GM bulletin 24-NA-031
What it saysThis service bulletin provides information for having brake pulsation and/or repeat brake pulsation. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Oct 9, 2024, received Feb 23, 2024, about the service brakes — 2 documents under this number. It names 14 model years across Chevrolet 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 · Cadillac.
Get the next GM bulletin for your model by email Weekly, only when something new is filed. Nothing else; one-click unsubscribe.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis service bulletin provides information for having brake pulsation and/or repeat brake pulsation.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 24-NA-031 | Service bulletin | Oct 9, 2024 | 11010574 | PDF, 199 KB |
| 24-NA-031 | Service bulletin | Feb 9, 2024 | 10250515 | PDF, 53 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 6 model years
Cadillac 8 model years
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
Email me new GM bulletins for one of these models
A weekly email, sent only in a week when GM files something new with NHTSA for the model you pick — service bulletins, campaigns, warranty extensions, over-the-air notices, every model year. Nothing else is sent; one-click unsubscribe in every message. Separate from recall alerts.
What owners reported
Source: NHTSA complaint databaseOwners of the 14 model years this bulletin names have filed 177 complaints with NHTSA since 2015. 15 of them name Service Brakes — 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 3/21/2026 @ approximately 1:45 PM I was driving down a local road @ approximately 25MPH. While approaching a stop sign, I attempted to stop the vehicle, I applied the brakes and the brake pedal dropped serval inches and became hard felt like it hit the floor of the vehicle. The vehicle continued through the intersection.
2025 Chevrolet Corvette · Service Brakes · filed with NHTSA Mar 23, 2026
Experiencing an ongoing problem where the brakes pulsate and vibrate badly, especially after rotors and pads get hot. I am concerned about the safety and possible failure of the brakes if it is not corrected. - The vehicle was purchased as CPO at Antwerpen Chevrolet dealership in Eldersburg, MD with 2155 miles on it.
2022 Chevrolet Corvette · Service Brakes · filed with NHTSA Oct 4, 2024
The problem first arose in June 2023. I was driving and suddenly, all the dashboard lights went on and the brakes stopped working. There was no pressure on the pedal. I was able to roll to a stop without incident. I turned the car off and back on again and the brakes worked but the check engine light was still on.
2022 Cadillac CT4 · Service Brakes · filed with NHTSA Jan 10, 2024
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 service brakes
Source: same model, same component group8 other manufacturer communications filed against these GM models under the same component group (service brakes), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 24-NA-221 | Service bulletin | Nov 7, 2025 | This service bulletin provides service procedure information on Brake Squeal or Squeak Noise Intermittently on Initial Brake Applies. |
| N252494220 | Service campaign | Jun 26, 2025 | Service Update. Certain vehicles listed above may have a condition in which braking performance is reduced, vehicle top speed is limited, a… |
| 24-NA-048 | Service bulletin | Feb 6, 2025 | This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engine… |
| PIC6429B | Service bulletin | Oct 25, 2024 | This Preliminary Information communicates information on resolving noise issues related to the brakes on this vehicle. |
| 17-NA-239 | Service bulletin | Oct 9, 2024 | This bulletin provides information on possible normal brake drag caused by the vehicle parked for an extended period of time. |
| 22-NA-026 | Service bulletin | Oct 8, 2024 | This service bulletin provides information for dealers/technicians on Brake Pulsation, Noise and/or Visible Pitting Condition to Brake Rotor… |
| 16-NA-059 | Service bulletin | Oct 8, 2024 | This technical bulletin provides a procedure on how to properly clean the brake calipers without damaging the paint on them for concerns reg… |
| 17-NA-040 | Service bulletin | Nov 9, 2023 | This technical bulletin provides a procedure to apply copper paste to the brake calipers to correct a condition of Brake Squeal or Squeak No… |
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-031 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-031 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-031 cover?
The manufacturer filed it against 14 model years across 2 brands (Chevrolet and Cadillac): 2025 Cadillac CT4, 2024 Cadillac CT4, 2023 Cadillac CT4, 2022 Cadillac CT4, 2025 Cadillac CT5, 2024 Cadillac CT5 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.