GM service campaign N252502390
What it saysCertain vehicles listed above may require software updates that improve the customer experience and optimize future over-the-air updates. NHTSA’s full summary ↓
GM filed this with NHTSA as a service campaign dated Jun 2, 2025, about the engine. It names 5 model years across GMC, Cadillac and Brightdrop (2022–2023). 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: 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 require software updates that improve the customer experience and optimize future over-the-air updates. Dealers will perform a comprehensive software update.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| N252502390 | Service campaign | Jun 2, 2025 | 11018802 | PDF, 477 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 themGMC 2 model years
Also filed against model years this site has no page for: 2022 GMC Hummer EV Pickup.
Cadillac 1 model year
Brightdrop 2 model years
Also filed against: 2022 Brightdrop EV600; 2023 Brightdrop Zevo 600.
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 2 model years this bulletin names have filed 23 complaints with NHTSA since 2015. 1 of them name Engine — 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.
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 engine
Source: same model, same component group10 other manufacturer communications filed against these GM models under the same component group (engine), newest first. The eight newest are listed; the rest are on the GMC list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| PIC6578C | Service bulletin | Aug 28, 2025 | This Preliminary information communicates procedure to relearn window motor when it reverses when expressing up. |
| N252502891 | Service campaign | Jul 16, 2025 | Customer Satisfaction Program. Certain vehicles listed above may have a condition in which the internal differential nut was cross threaded… |
| 23-NA-153 | Service bulletin | May 15, 2025 | The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle response when the throttle plate is… |
| 22-NA-074 | Service bulletin | Jan 30, 2025 | This service bulletin provides service information to technicians on guidelines to replace Oil Cooler, Oil Cooler Lines and Oil Tank if the… |
| PIT5832S | Service bulletin | Dec 13, 2024 | This Preliminary information communicates a diagnostic tip on how to resolve a issue if the serial data authentication configuration did not… |
| N242435600 | Service campaign | Sep 4, 2024 | Customer Satisfaction Program - certain vehicles vehicles may require software updates that improve the customer experience and optimize fut… |
| 18-NA-073 | Service bulletin | Aug 19, 2024 | This service bulletin provides graphics, information and guidelines for engine component wear to assist service personnel as a guideline to… |
| N242439340-01 | Service campaign | Aug 16, 2024 | Customer Satisfaction Program. On certain vehicles, the front electric drive unit may not have passed the end of line test. Dealers are to… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for GMC, Cadillac and Brightdrop, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM N252502390 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 N252502390 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 N252502390 cover?
The manufacturer filed it against 5 model years across 3 brands (GMC, Cadillac and Brightdrop): 2023 Cadillac Lyriq, 2023 GMC Hummer EV, 2022 Brightdrop EV600, 2023 Brightdrop Zevo 600, 2022 GMC Hummer EV Pickup. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.