GM bulletin 21-NA-089
What it saysThis technical bulletin provides a procedure to replace the rear calipers if found packed for of mud and debris. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Oct 30, 2024, received Apr 12, 2023, about the service brakes — 3 documents under this number. It names 14 model years across Chevrolet and GMC (2019–2025). 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.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis technical bulletin provides a procedure to replace the rear calipers if found packed for of mud and debris.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 21-NA-089 | Service bulletin | Oct 30, 2024 | 11011210 | PDF, 168 KB |
| 21-NA-089 | Service bulletin | Jul 11, 2024 | 11004999 | PDF, 199 KB |
| 21-NA-089 | Service bulletin | Mar 16, 2023 | 10234108 | PDF, 65 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 85140318 | CALIPER, RR | 1 | eBay Motors → |
| 85140319 | Bulletin No.: 21-NA-089 October, 2024 Page | 1 | eBay Motors → |
Read by machine from the document NHTSA serves (3 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 7 model years
GMC 7 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 14 model years this bulletin names have filed 7,423 complaints with NHTSA since 2015. 624 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 the 2019 Chevrolet Silverado, the 122 owners who gave an odometer reading for Service Brakes reported it at a median of 8,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
After the latest update from the Dealer, the integrated trailer brake module no longer shows an output of how much power it's applying to the trailer brake system. It just stays blank. I can tell that the brakes actually are being applied, however not having indication of them being applied and how much pressure is applied is concerning
2024 GMC Sierra · Service Brakes · filed with NHTSA Jun 2, 2026
The first issue is a bluetooth issue. The phone volume goes silent when I get in my vehicle. If I connect to car play, it works. I have missed important calls due to this issue. This started in july of 2019 and its not fixed yet. GM says it apple. Apple says its GM I do not care just fix it. Second see below images. You know the issue.
2019 GMC Sierra · Service Brakes · filed with NHTSA Feb 19, 2020
Vehicle lost engine power on the road. Light display came on stating engine reduce power. It would not pull the trailer. Had to pull over and the display went away only to appear again later. We brought vehicle to chevrolet dealer . The part needed to hopefully fix is on backorder. There is also recall with no available remedy.
2020 Chevrolet Silverado · Service Brakes · filed with NHTSA Jul 10, 2025
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 group27 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 |
|---|---|---|---|
| 25-NA-264 | Service bulletin | Sep 3, 2025 | This informational bulletin provides information on Automated Brake Bleed and/or Brake Hydraulic Test procedure fails when attempting to per… |
| 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… |
| PIT5828D | Service bulletin | Jan 9, 2025 | This Preliminary Information communication provides information to the technician about customers that may request the factory Integrated Tr… |
| PIT6134G | Service bulletin | Jan 7, 2025 | This Preliminary information communicates an issue with premature brake pad life and engineering is working on release new pad lining materi… |
| 24-NA-073 | Service bulletin | Jan 3, 2025 | This technical bulletin provides a procedure to inform drivers that under certain driving conditions such as hilly or mountainous roads acco… |
| PIT6134F | Service bulletin | Dec 19, 2024 | This Preliminary information communicates an issue with premature brake pad life and engineering is working on release new pad lining materi… |
| 24-NA-045 | Service bulletin | Dec 19, 2024 | This informational bulletin provides information on Pop/Creak Type Noise While Sitting Stationary and Turning Steering Wheel with Brakes App… |
| PIT6134E | Service bulletin | Nov 15, 2024 | This Preliminary information communicates an issue with premature brake pad life and engineering is working on release new pad lining materi… |
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 GMC, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM 21-NA-089 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-089 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-089 cover?
The manufacturer filed it against 14 model years across 2 brands (Chevrolet and GMC): 2025 Chevrolet Silverado, 2024 Chevrolet Silverado, 2023 Chevrolet Silverado, 2022 Chevrolet Silverado, 2021 Chevrolet Silverado, 2020 Chevrolet Silverado and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.