GM bulletin 23-NA-202
What it saysThis service bulletin provides information on High Voltage Drive Motor Battery - TAC Approval and Exchange Program for BrightDrop, Chevrolet Silverado EV, and GMC Sierra EV, HUMMER EV/SUV. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated May 14, 2025, received Dec 6, 2023, about the electrical system — 9 documents under this number. It names 11 model years across Chevrolet, GMC and Cadillac (2022–2025). 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 · Cadillac.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis service bulletin provides information on High Voltage Drive Motor Battery - TAC Approval and Exchange Program for BrightDrop, Chevrolet Silverado EV, and GMC Sierra EV, HUMMER EV/SUV.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 23-NA-202 | Service bulletin | May 14, 2025 | 11024487 | PDF, 297 KB |
| 23-NA-202 | Service bulletin | Apr 17, 2025 | 11019370 | PDF, 297 KB |
| 23-NA-202 | Service bulletin | Nov 20, 2024 | 11011955 | PDF, 170 KB |
| 23-NA-202 | Service bulletin | Aug 21, 2024 | 11007995 | PDF, 167 KB |
| 23-NA-202 | Service bulletin | Jun 13, 2024 | 11003835 | PDF, 190 KB |
| 23-NA-202 | Service bulletin | Feb 16, 2024 | 10250721 | PDF, 54 KB |
| 23-NA-202 | Service bulletin | Jan 8, 2024 | 10249453 | PDF, 75 KB |
| 23-NA-202 | Service bulletin | Dec 31, 2023 | 10248728 | not found |
| 23-NA-202 | Service bulletin | Nov 15, 2023 | 10246269 | PDF, 514 KB |
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 4 model years
Also filed against model years this site has no page for: 2025 Chevrolet Brightdrop 400; 2025 Chevrolet Brightdrop 600.
GMC 6 model years
Also filed against model years this site has no page for: 2022 GMC Hummer EV Pickup.
Cadillac 1 model year
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 8 model years this bulletin names have filed 1,044 complaints with NHTSA since 2015. 246 of them name Electrical System, Fuel/Propulsion 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.
The vehicle experienced repeated high-voltage system warnings and battery conditioning system failures. On multiple occasions the “Service High Voltage System” message appeared along with codes P0530 and P1C26 related to the lithium-ion battery conditioning system that controls heating and cooling of the high-voltage battery pack.
2025 Chevrolet Silverado · Electrical System · filed with NHTSA Jul 15, 2026 · ODI 11750505
On , at approximately 15,200 miles, my 2025 Cadillac Escalade V developed multiple warnings while I was driving at highway speed. These included reduced acceleration, speed limited to 62 mph, service power steering, service traction control, rear axle system off, and unavailable forward-collision and adaptive-cruise functions.
2025 Cadillac Escalade · Electrical System · filed with NHTSA Sep 5, 2026 · ODI 11762393
While traveling with my wife and two toddlers over the July 4th holiday weekend, the 12 volt battery on my 2025 GMC Hummer EV failed completely at approximately 7,500 miles and five months of ownership. The vehicle would not accept a jump start and was disabled where it sat, stranding my family.
2025 GMC Hummer EV · Electrical System · filed with NHTSA Aug 15, 2026 · ODI 11757089
In depth: 2024 Chevrolet Silverado 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 group318 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 |
|---|---|---|---|
| N252514001 | Service campaign | Oct 5, 2026 | Service Update. Certain vehicles listed above may enable the new King Crab Feature through OTA programming or programming at the dealer. De… |
| 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… |
| 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… |
| 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-153 | Service bulletin | Jun 5, 2025 | This informational bulletin provides Information on Rear Upper Body Structure Auxiliary Lamp Will Not Turn ON. |
| 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 Cadillac, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM 23-NA-202 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 23-NA-202 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 23-NA-202 cover?
The manufacturer filed it against 11 model years across 3 brands (Chevrolet, GMC and Cadillac): 2025 Cadillac Escalade, 2025 Chevrolet Silverado, 2024 Chevrolet Silverado, 2025 GMC Hummer EV, 2024 GMC Hummer EV, 2023 GMC Hummer EV and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.