GM bulletin 21-NA-003
What it saysThis service bulletin provides a repair procedure to correct a customer concern of Loss of and/or Reduced Propulsion. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Feb 26, 2024, received May 31, 2022, about the power train — 3 documents under this number. It names 15 model years across Chevrolet and Buick (2019–2024). 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 · Buick.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis service bulletin provides a repair procedure to correct a customer concern of Loss of and/or Reduced Propulsion.
Trouble codes it names: P0730 P0746 P0776 P0841 P0846 P0961 P0965 P2723 all 8 read from the document itself; NHTSA’s summary names none
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 21-NA-003 | Service bulletin | Feb 26, 2024 | 10251351 | PDF, 78 KB |
| 21-NA-003 | Service bulletin | Jul 1, 2022 | 10215670 | PDF, 510 KB |
| 21-NA-003 | Service bulletin | May 11, 2022 | 10212918 | PDF, 507 KB |
What the document itself lists
The manufacturer titles it “Loss of and/or Reduced Propulsion, DTCs P0730, P0746, P0776, P0841, P0846, P0961”.
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 24042059 | X BODY, C/VLV | 1 | eBay Motors → |
| 24295253 | X BODY, C/ | 2 | eBay Motors → |
| 24288570 | N/A SEAL, C/VLV | 1 | eBay Motors → |
| 24280824 | N/A SEAL, A/TRNS | 1 | eBay Motors → |
| 24292808 | N/A PLUG, A/TRNS | 1 | eBay Motors → |
| 24285336 | N/A FLUID, TRNS Refer | 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 10 model years
Buick 5 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 15 model years this bulletin names have filed 1,378 complaints with NHTSA since 2015. 1,065 of them name Electrical System, Engine, Power Train — 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 Malibu, the 24 owners who gave an odometer reading for Power Train reported it at a median of 48,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
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 · ODI 11717268
The contact owns a 2023 Chevrolet Malibu. The contact stated that while driving 75 MPH, the vehicle jerked abnormally with several unknown warning lights illuminated and unknown messages were displayed. Additionally, there was a white fuel warning light illuminated with the message “Low Fuel” displayed after refueling the vehicle.
2023 Chevrolet Malibu · Engine · filed with NHTSA Mar 9, 2026 · ODI 11722895
I need my pistons and rings replaced. My car only has 57,000 miles. My car has been diagnosed with excessive piston blowby from 2 different independent service centers. Both times I have been to Chevy to get it fixed under warranty, they’ve charged me $200 for diagnostics each time and told me it is my PCV valve that needs fixed.
2020 Chevrolet Malibu · Power Train · filed with NHTSA Mar 16, 2022 · ODI 11456916
In depth: 2020 Chevrolet Malibu electrical problems → · 2020 Chevrolet Malibu engine problems → · 2020 Chevrolet Malibu transmission and drivetrain problems → · 2019 Chevrolet Malibu 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 power train
Source: same model, same component group48 other manufacturer communications filed against these GM models under the same component group (power train), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| PIP6036A | Service bulletin | Apr 2, 2025 | This Preliminary information communicates diagnostic aids for a surge or fishbite concern |
| 25-NA-001 | Service bulletin | Mar 13, 2025 | This service bulletin provides repair information to correct a customer concern of a transmission fluid leak. |
| PIP5975A | Service bulletin | Feb 25, 2025 | This Preliminary information communicates information on what dealer technicians should due if they encounter a broken chain on a CVT transm… |
| 16-NA-019 | Service bulletin | Feb 12, 2025 | This informational buleltin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flare… |
| PIP6032A | Service bulletin | Jan 29, 2025 | This Preliminary Information communication advises the technician on possible sources of transmission fluid leaks from the transmission oil… |
| PIP6036 | Service bulletin | Jan 9, 2025 | This Preliminary information communicates diagnostic aids for a surge or fishbite concern |
| 09-06-04-026Z | Service bulletin | Jan 9, 2025 | This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2. |
| PIP6033 | Service bulletin | Dec 11, 2024 | This Preliminary information communicates to technicians to remove the pulley assembly and inspect the drive chain and pulley surfaces. |
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 Buick, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM 21-NA-003 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-003 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-003 cover?
The manufacturer filed it against 15 model years across 2 brands (Chevrolet and Buick): 2024 Buick Encore, 2023 Buick Encore, 2022 Buick Encore, 2021 Buick Encore, 2020 Buick Encore, 2024 Chevrolet Malibu and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.