GM service campaign N252529080
What it saysCertain vehicles listed above may be missing a high voltage header plug on the RESS battery pack drive motor connector. NHTSA’s full summary ↓
GM filed this with NHTSA as a service campaign dated Apr 1, 2026, about the electrical system. It names 17 model years across Chevrolet, GMC, Cadillac and Brightdrop (2023–2026). A service campaign is not a safety recall — there is no NHTSA campaign number and no federal requirement — but it is usually work the manufacturer pays for on the vehicles it names; the dealer checks the VIN against the manufacturer’s list.
One page for every brand it was filed under. Each brand’s bulletins: Chevrolet · GMC · Cadillac · Brightdrop.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationPicked out of NHTSA’s summary below, word for word. The document itself is the record, and the dealer checks the VIN.
Service Update. Certain vehicles listed above may be missing a high voltage header plug on the RESS battery pack drive motor connector. Dealers are to inspect the RESS pack connectors and install the proper HV Header Plug if missing.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| N252529080 | Service campaign | Apr 1, 2026 | 11030439 | PDF, 669 KB |
What the document itself lists
The manufacturer titles it “N252529080 - Service Update”.
Part the bulletin names
| Part number | Description | Qty |
|---|---|---|
| 13544801 | X3 Connector Header Plug | — |
Read by machine from the document NHTSA serves (6 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.
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 5 model years
Also filed against model years this site has no page for: 2025 Chevrolet Brightdrop 400; 2025 Chevrolet Brightdrop 600.
GMC 7 model years
Also filed against model years this site has no page for: 2026 GMC Hummer EV Pickup; 2026 GMC Hummer EV SUV.
Cadillac 2 model years
Brightdrop 3 model years
Also filed against: 2023 Brightdrop 600 Elcv; 2024 Brightdrop 600 Elcv; 2024 Brightdrop Zevo 400.
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 10 model years this bulletin names have filed 1,400 complaints with NHTSA since 2015. 240 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.
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
Repeated failures on my 2025 GMC Sierra EV. The truck shows 'Service High Voltage Battery' and the high voltage battery makes a high-pitched hissing noise; it has thrown battery errors twice. The A/C has failed repeatedly; this summer a passenger in the truck overheated and suffered heat stroke because the A/C was not working.
2025 GMC Sierra · Electrical System · filed with NHTSA Oct 28, 2026 · ODI 11774289
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 group310 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… |
| 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… |
| 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, Cadillac and Brightdrop, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM N252529080 a recall?
No. A service campaign 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 N252529080 repair free?
A service campaign is usually paid by the manufacturer on the vehicles it names, within the terms and time limit the document sets; the dealer checks the VIN against the manufacturer’s list.
Which vehicles does N252529080 cover?
The manufacturer filed it against 17 model years across 4 brands (Chevrolet, GMC, Cadillac and Brightdrop): 2026 Cadillac Escalade, 2025 Cadillac Escalade, 2026 Chevrolet Silverado, 2025 Chevrolet Silverado, 2024 Chevrolet Silverado, 2025 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.