GM bulletin 21-NA-054
What it saysThis service bulletin provides repair information to correct various functional concerns of the Instrument Cluster and DTC U0155. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Apr 22, 2024, received Nov 3, 2022, about the electrical system — 4 documents under this number. It names 25 model years across Chevrolet, GMC and Buick (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 · Buick.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis service bulletin provides repair information to correct various functional concerns of the Instrument Cluster and DTC U0155.
Trouble codes it names: U0155
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 21-NA-054 | Service bulletin | Apr 22, 2024 | 11000151 | PDF, 1,204 KB |
| 21-NA-054 | Service bulletin | Mar 22, 2024 | 10252127 | PDF, 137 KB |
| 21-NA-054 | Service bulletin | Feb 6, 2023 | 10232072 | PDF, 119 KB |
| 21-NA-054 | Service bulletin | Oct 20, 2022 | 10225661 | not found |
What the document itself lists
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 2889248 | Instrument Cluster Reprog- ramming for Cluster Errors | 0.3 hrs |
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.
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.
Find the instrument cluster/panel for the 2024 Blazer →Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
Model years it names
Source: as the manufacturer filed themChevrolet 15 model years
GMC 7 model years
Buick 3 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 25 model years this bulletin names have filed 1,547 complaints with NHTSA since 2015. 351 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 February 4, 2026, my wife drove to the bank, a trip of about 10 to 15 minutes, and turned off the car at the ATM. When she tried to leave, the vehicle wouldn't start. After a while, she opened and closed the door and locked and unlocked the car twice with the remote control, and the vehicle started and she was able to drive, but all…
2024 Chevrolet Blazer · Electrical System · filed with NHTSA Feb 5, 2026
MY 2023 CHEVY MALIBU HAS A MISSING TURBOCHARGER SCREW THAT RANDOMLY CAME OFF FROM UNDER A METAL PLATE ON ITS OWN, GMC HAS A RECALL ON 2022 -2023 CHEY MALIBU WITH TURBO CHARGER ISSUES BUT THEY WONT COVER MINES BECAUSE IT DIDNT COME FROM A CERTIAN FACTORY ALTHOUGH THEY KNOW A HELL OF ALOT OF CHEVY MALIBU OWNERS HAVE TURBO CHARGER ISSUES…
2023 Chevrolet Malibu · Electrical System · filed with NHTSA Feb 11, 2026
Took dealer 3/26 for Sam issue Engine Power reduced after already cause me hit curb. Got it out 4/1/26 Now 4/5/26 it happened again same codes after they claimed they fixed it. Also keep having Emergency services come on a caused my dashboard out. My issues is car keeps stalling losing power. Same codes as week ago after dealer fix.
2023 GMC Terrain · Electrical System · filed with NHTSA Apr 5, 2026
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 group208 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 |
|---|---|---|---|
| N242468490-02 | Service campaign | May 28, 2026 | Certain vehicles may have missing cavity plugs from the rear chassis harness electrical connector. Dealers are to inspect the rear chassis h… |
| 24-NA-166 | Service bulletin | Nov 7, 2025 | This technical bulletin provides repair information to correct a customer concern of DTC C1171 C1172 C1173 C1174 Tire Pressure Monitor Senso… |
| 24-NA-227 | Service bulletin | Nov 4, 2025 | This technical bulletin provides repair information to correct a customer concern of Vibration Rattle or Boom at 1800 to 2000 RPM. |
| 18-NA-180 | Service bulletin | Sep 4, 2025 | This Warranty Administration service bulletin provides Lithium-Ion battery Exchange Process and Transaction Submission information. |
| 23-NA-119 | Service bulletin | Sep 3, 2025 | This service bulletin provides service procedure information to correct a customer concern of Shift to Park Displayed on DIC When Vehicle is… |
| 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. |
| 24-NA-272 | Service bulletin | Jun 5, 2025 | This technical bulletin provides repair information to correct a customer concern of Park Assist False Alerts on Z71 Traverse. |
| 22-NA-083 | Service bulletin | May 17, 2025 | This service bulletin provides Requirements for Replacement of the Dual Mode Cord Set Under Warranty. |
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 and Buick, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM 21-NA-054 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-054 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-054 cover?
The manufacturer filed it against 25 model years across 3 brands (Chevrolet, GMC and Buick): 2024 Buick Enclave, 2023 Buick Enclave, 2022 Buick Enclave, 2024 Chevrolet Blazer, 2023 Chevrolet Blazer, 2022 Chevrolet Blazer and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.