GM bulletin 21-NA-184
What it saysThis service bulletin provides a procedure to update the calibrations after Window Regulator electronics or window motor replacement. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Oct 23, 2024, received Apr 13, 2023, about the electrical system — 4 documents under this number. It names 12 model years across Chevrolet and GMC (2021–2024). 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 · GMC.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis service bulletin provides a procedure to update the calibrations after Window Regulator electronics or window motor replacement.
Trouble codes it names: B1956 all 1 read from the document itself; NHTSA’s summary names none
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 21-NA-184 | Service bulletin | Oct 23, 2024 | 11011013 | PDF, 848 KB |
| 21-NA-184 | Service bulletin | Jan 11, 2024 | 10249035 | PDF, 139 KB |
| 21-NA-184 | Service bulletin | Jul 17, 2023 | 10239666 | PDF, 139 KB |
| 21-NA-184 | Service bulletin | Mar 22, 2023 | 10234146 | PDF, 137 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 86791280 | — | — | |
| 84951244 | — | — | |
| 85112189 | — | — | |
| 86791279 | Continental | 1 | eBay Motors → |
| 85543164 | — | — | |
| 85564266 | — | — | |
| 85543165 | Bosch Window | 1 | eBay Motors → |
| 85569746 | — | — | |
| 85569795 | — | — | |
| 85569747 | Page 6 October, 2024 Bulletin No.: 21-NA-184 | 1 | eBay Motors → |
| 85568144 | — | — | |
| 85568145 | Brose Window | 1 | eBay Motors → |
| 84951245 | — | — | |
| 85112194 | — | — | |
| 85637881 | — | — | |
| 84985418 | — | — | |
| 84985419 | — | — |
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.
Doing the repair yourself, or pricing it before the shop does? Search the part by fitment on eBay Motors — the listing and the price are the seller’s.
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Model years it names
Source: as the manufacturer filed themChevrolet 8 model years
GMC 4 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 12 model years this bulletin names have filed 3,079 complaints with NHTSA since 2015. 408 of them name Electrical System — 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.
Serious Safety Issue: While driving in the Rain, with the wipers on (actively working), randomly they will stop working. They will not work again until 10-15 minutes of time has passed. Any alternative setting makes no difference. During the 10-15 minutes of non-working wipers, there is nothing the driver can do…. Except wait.
2023 GMC Yukon · Visibility/Wiper · filed with NHTSA Sep 17, 2024 · ODI 11615109
The contact owns a 2021 Chevrolet Tahoe. The contact stated that while driving at an undisclosed speed, the vehicle idled and loss power. The contact detected a smoke odor and smoke came inside the vehicle from the rear seats. The service ESC, traction control, forward collision, and engine warning lights were illuminated.
2021 Chevrolet Tahoe · Electrical System · filed with NHTSA Apr 19, 2021 · ODI 11412837
Large fire started at rear of car. Car was parked on driveway and no one was inside. Noticed a burning smell before fire started. Could not locate any smoke. Vehicle rear burst into flames 20 minutes later. Fire department responded quickly and was able to put out the fire before it reached the house. Vehicle is totaled.
2021 GMC Yukon · Electrical System · filed with NHTSA Apr 3, 2023 · ODI 11515133
In depth: 2021 Chevrolet Tahoe electrical problems → · 2023 GMC Yukon electrical problems → · 2022 GMC Yukon electrical 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 electrical system
Source: same model, same component group157 other manufacturer communications filed against these GM models under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 18-NA-180 | Service bulletin | Sep 4, 2025 | This Warranty Administration service bulletin provides Lithium-Ion battery Exchange Process and Transaction Submission information. |
| 25-NA-021 | Service bulletin | Jun 7, 2025 | This technical bulletin provides repair information to correct a customer concern of Radio Software Update W23E-178.1.2-M174-SQBR6-93.3. |
| 25-NA-119 | Service bulletin | May 9, 2025 | This service bulletin provides information on the Service Safety Restraint Message displayed on the DIC Airbag malfunction indicator illumin… |
| 25-NA-085 | Service bulletin | May 9, 2025 | This service bulletin provides information on software related issues and provides technicians information to update the radio software to t… |
| 22-NA-242 | Service bulletin | Apr 24, 2025 | This warranty administration bulletin provides information for dealers/technicians on System Reset and Connector Reconnect Labor Code Number… |
| 24-NA-113 | Service bulletin | Apr 23, 2025 | This service bulletin provides information for dealers/technicians on Vehicle Wide Programming Instructions. |
| 25-NA-099 | Service bulletin | Apr 22, 2025 | This bulletin advises the tech to refer to a procedure in SI to aid in diagnosing a possible wiring concern. |
| 25-NA-097 | Service bulletin | Apr 17, 2025 | This service Bulletin provides information on the correction of that one or more Tire Pressure Monitor Sensor (TPMS) showing dashes after re… |
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-184 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-184 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 21-NA-184 cover?
The manufacturer filed it against 12 model years across 2 brands (Chevrolet and GMC): 2024 Chevrolet Suburban, 2023 Chevrolet Suburban, 2022 Chevrolet Suburban, 2021 Chevrolet Suburban, 2024 Chevrolet Tahoe, 2023 Chevrolet Tahoe and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.