GM bulletin 21-NA-171
What it saysThis informational bulletin provides information for dealers/technicians on Body Control Module Programming due to Window Motor Changes Related to Microprocessor Shortage. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Mar 11, 2024, received Nov 3, 2022, about the electrical system — 2 documents under this number. It names 4 model years across Chevrolet and GMC (2021–2022). 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 communicationWhat it applies to, as the document itself states it — the build window in the manufacturer’s own words, read by machine from the PDF NHTSA serves. The build date is on the certification label in the driver’s door jamb; the dealer settles a borderline vehicle by its VIN.
This informational bulletin provides information for dealers/technicians on Body Control Module Programming due to Window Motor Changes Related to Microprocessor Shortage.
Trouble codes it names: B3205 B3210 all 2 read from the document itself; NHTSA’s summary names none
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 21-NA-171 | Service bulletin | Mar 11, 2024 | 10251903 | PDF, 90 KB |
| 21-NA-171 | Service bulletin | Oct 28, 2022 | 10225734 | not found |
What the document itself lists
The manufacturer titles it “Information on Body Control Module Programming due to Window Motor Changes”.
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 84903315 | — | — | |
| 84903317 | Continental | — | eBay Motors → |
| 85543479 | — | — | |
| 85543480 | Page 6 March, 2024 Bulletin No.: 21-NA-171 | — | eBay Motors → |
Read by machine from the document NHTSA serves (7 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 2 model years
GMC 2 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 4 model years this bulletin names have filed 2,716 complaints with NHTSA since 2015. 415 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.
On the 2021 GMC Sierra, the 17 owners who gave an odometer reading for Electrical System reported it at a median of 23,300 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
Electrical component- Dashboard is constantly glitching, blue-tooth will not connect properly, electrical appears to turn off randomly while driving to the point we have to pullover because it appears and feels like the truck is turning off. Power step running boards malfunction- They don't open or close when they are supposed to.
2022 GMC Sierra · Electrical System · filed with NHTSA Nov 10, 2022 · ODI 11493129
My 2022 Silverado is affected by a couple different electronic safety issues. The first one has to do with the trailering system. When I have trailer connected that has electronic brakes on it, the vehicle gives an error message and then shuts the break control off.
2022 Chevrolet Silverado · Electrical System · filed with NHTSA Dec 5, 2022 · ODI 11496139
Driver side front marker light bulb not working after 700mi. Not a big problem but annoying enough for a 2 week old, $49,000 truck
2021 Chevrolet Silverado · Electrical System · filed with NHTSA Jun 14, 2021 · ODI 11420790
In depth: 2022 Chevrolet Silverado electrical problems → · 2021 Chevrolet Silverado electrical problems → · 2022 GMC Sierra electrical problems → · 2021 GMC Sierra 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 group221 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 |
|---|---|---|---|
| N262565450 | Service campaign | Oct 26, 2026 | Customer Satisfaction Program. Certain vehicles listed above may have a condition in which remanufactured high voltage battery packs were b… |
| N252529080 | Service campaign | Apr 1, 2026 | Service Update. Certain vehicles listed above may be missing a high voltage header plug on the RESS battery pack drive motor connector. Dea… |
| N252515590 | Service campaign | Jan 27, 2026 | Certain vehicles listed above, may have a condition in which the body-to-chassis ground strap may be corroded. Dealers will replace the grou… |
| 18-NA-180 | Service bulletin | Sep 4, 2025 | This Warranty Administration service bulletin provides Lithium-Ion battery Exchange Process and Transaction Submission information. |
| 22-NA-083 | Service bulletin | May 17, 2025 | This service bulletin provides Requirements for Replacement of the Dual Mode Cord Set Under Warranty. |
| 23-NA-151 | Service bulletin | May 16, 2025 | This service bulletin and criteria within are to determine the internal state of the High Voltage Battery and core return shipping method. |
| PIE0753I | Service bulletin | May 15, 2025 | This engineering information (EI) will assist GM to recover a small number of electric vehicle battery packs from customer-owned vehicles in… |
| 25-NA-044 | Service bulletin | May 14, 2025 | This service bulletin provides information for dealers/technicians on SPS2 Hybrid/EV Battery Data Retrieval for Service High Voltage DTCs. |
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-171 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-171 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-171 cover?
The manufacturer filed it against 4 model years across 2 brands (Chevrolet and GMC): 2022 Chevrolet Silverado, 2021 Chevrolet Silverado, 2022 GMC Sierra, 2021 GMC Sierra. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone. The document itself sets the build window: 2021 Vehicles: built after 4 Jun 2021 — the build date is on the certification label in the driver’s door jamb.