GM bulletin 21-NA-142
What it saysThis technical bulletin provides repair information to correct a customer concern of hearing front brake grind/groan noise after sitting overnight. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Jan 9, 2025, received Mar 30, 2022, about the service brakes — 10 documents under this number. It names 24 model years across Chevrolet, GMC, Buick and Cadillac (2020–2023). 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 · Buick · Cadillac.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis technical bulletin provides repair information to correct a customer concern of hearing front brake grind/groan noise after sitting overnight.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 21-NA-142 | Service bulletin | Jan 9, 2025 | 11012931 | PDF, 845 KB |
| 21-NA-142 | Service bulletin | Dec 18, 2023 | 10248706 | not found |
| 21-NA-142 | Service bulletin | Nov 17, 2023 | 10245560 | PDF, 136 KB |
| 21-NA-142 | Service bulletin | May 18, 2023 | 10237319 | PDF, 151 KB |
| 21-NA-142 | Service bulletin | Feb 13, 2023 | 10232153 | PDF, 3,336 KB |
| 21-NA-142 | Service bulletin | Jan 30, 2023 | 10231521 | PDF, 499 KB |
| 21-NA-142 | Service bulletin | Dec 14, 2022 | 10228891 | not found |
| 21-NA-142 | Service bulletin | Aug 23, 2022 | 10219288 | PDF, 74 KB |
| 21-NA-142 | Service bulletin | Apr 14, 2022 | 10210544 | PDF, 500 KB |
| 21-NA-142 | Service bulletin | Mar 9, 2022 | 10209401 | PDF, 498 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 85619135 | — | — | |
| 85654968 | — | — | |
| 85520396 | Revised January 27, 2022 – Updated Breakpoints | — | eBay Motors → |
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 2486308 | Front Disc Brake Pads Replacement and Scuff Both Front Rotors Enclave | 1.1 hrs |
Read by machine from the document NHTSA serves (8 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
Buick 4 model years
Cadillac 6 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 24 model years this bulletin names have filed 1,347 complaints with NHTSA since 2015. 418 of them name Electrical System, 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.
There are crackling sounds coming from the wheel when going over humps. no power while driving or changing lanes it's worst when the ac is on, was burning gas like crazy, and shakes at 65 mph., the gas while escalating makes a clicking noise like 2 iron knocking together, and the dashboard including the radio, and telephone screens goes…
2021 Chevrolet Colorado · Electrical System · filed with NHTSA Jul 25, 2023
My Acadia has had a stuttering problem and we have taken it to the dealership many times. They finally changed the torque converter but that didn’t fix it. Now today (4/15/25) I got home and I was getting a steering assist reduced error code and then when I turned my car off the fan went as high as it could and wouldn’t turn off.
2022 GMC Acadia · Electrical System · filed with NHTSA Apr 15, 2025
Vehicle would not go into park fortunately we were in a safe location to avoid a possible accident or injury. The vehicle has electronic transmission shifting. According to the dealership the park solenoid in the transmission valve body failed. This prevented us from putting the vehicle in park so it could safely be shut off.
2020 Buick Enclave · Electrical System · filed with NHTSA Aug 21, 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 group24 other manufacturer communications filed against these GM models under the same component group (service brakes), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| N252521980-01 | Service campaign | Oct 31, 2025 | Certain vehicles listed above, may have a condition in which the Brake System Control Module does not have the latest software. Dealers are… |
| N252521980 | Service campaign | Oct 22, 2025 | Certain vehicles, may have a condition in which the Brake System Control Module does not have the latest software. Dealers are to reprogram… |
| N252519910 | Service campaign | Aug 27, 2025 | Certain vehicles may have a condition in which the Front Right Brake Line Fitting is torqued under specification. Dealers are to tighten the… |
| N242482170-01 | Service campaign | Aug 20, 2025 | Service Update. Certain vehicles listed above may have a condition in which the internal cartridge seal in the eBoost Module is missing. De… |
| 25-NA-064 | Service bulletin | Mar 20, 2025 | This informational bulletin provides information on the brake system warning lamp illuminated on driver information center (DIC), brake peda… |
| 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… |
| N242482170 | Service campaign | Dec 9, 2024 | Service update - Certain vehicles may have a condition in which the internal cartridge seal in the eBoost Module is missing. Dealers are to… |
| PIT5696H | Service bulletin | Dec 6, 2024 | This preliminary information discusses potential for a code C0010.5A to store in the brake controller which appears to be setting falsely or… |
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, Buick and Cadillac, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM 21-NA-142 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 21-NA-142 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 21-NA-142 cover?
The manufacturer filed it against 24 model years across 4 brands (Chevrolet, GMC, Buick and Cadillac): 2023 Buick Enclave, 2022 Buick Enclave, 2021 Buick Enclave, 2020 Buick Enclave, 2023 Cadillac XT5, 2022 Cadillac XT5 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.