GM service campaign N252517790
What it saysCertain vehicles, equipped with 8L80 or 8L90 Transmissions, may have a condition in which the reaction carrier cracks. NHTSA’s full summary ↓
GM filed this with NHTSA as a service campaign dated Oct 14, 2025, about the power train. It names 8 model years across Chevrolet and GMC (2025–2026). 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.
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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.
What it applies to, as NHTSA’s summary states it — build dates and equipment as the manufacturer filed them. The dealer checks the VIN and the build date on the door jamb; a vehicle outside the window is not covered by this bulletin.
Certain vehicles, equipped with 8L80 or 8L90 Transmissions, may have a condition in which the reaction carrier cracks. Dealers are to replace the reaction carrier.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| N252517790 | Service campaign | Oct 14, 2025 | 11024270 | PDF, 421 KB |
What the document itself lists
The manufacturer titles it “N252517790 - Customer Satisfaction Program”.
Parts the bulletin names
| Part number | Description | Qty |
|---|---|---|
| 24059373 | CARRIER ASM-REACTION | — |
| 11547864 | BOLT, PARK PAWL ACTUATOR BRACKET | — |
| 11548404 | BOLT, SENSOR | — |
| 85628205 | SEAL, TRANS FLUID CLR | — |
| 84576034 | CLAMP, PROP SHF SLIP YOKE BOOT (1 PIECE DRIVESHAFT) | — |
| 26064275 | CLAMP, PROP SHF SLIP YOKE BOOT (2 PIECE DRIVESHAFT) | — |
| 84407373 | GASKET, CTLTC CONV | — |
| 84308104 | CLAMP, TRFER CASE FRT OUTPUT SHF BOOT | — |
| 86816628 | GASKET/TRFER CASE ADAP | — |
| 19417577 | — | — |
| 19418066 | — | — |
| 84124171 | CLAMP, TRFER CASE FRT OUTPUT SHF BOOT | — |
| 85628209 | SEAL, TRANS FLUID CLR PIPE | — |
| 84653921 | MOUNT, TRANS (w/ 4WD) | — |
| 84653922 | MOUNT, TRANS (w/ 2WD) | — |
| 20987829 | SEAL, EXH MANIF PIPE (DONUT STYLE) | — |
| 85573142 | CLAMP, PROP SHF SLIP YOKE BOOT | — |
| 11548472 | BOLT, RR PROP SHF | — |
| 23170499 | RETAINER, RR PROP SHF FOR VEHICLES WITH 35MM U-JOINT | — |
| 23107857 | RETAINER, RR PROP SHF FOR VEHICLES WITH 30MM U-JOINT | — |
| 12650609 | SEAL, TRANS FLUID CLR PIPE FTG (O RING) | — |
Read by machine from the document NHTSA serves (9 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 4 model years
GMC 4 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 8 model years this bulletin names have filed 322 complaints with NHTSA since 2015. 59 of them name 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.
I’ve included all my repair orders regarding to coolant smell/leak and transmission shutter. I purchased my truck on XXX. We had planned a family vacation to , and we were driving up when I felt the transmission shutter at around 3:00 to 5:00 p.m. while cruising at approximately 55 to 62 mph.
2026 GMC Canyon · Power Train · filed with NHTSA Sep 9, 2026 · ODI 11763030
I was pushing the accelerator, and the transmission hesitated at about 45 mph. For about 2-3 seconds, the vehicle would not upshift. The RPMs revved, and finally the vehicle slam-shifted into gear. The vehicle drove normally for the rest of the drive cycle
2026 GMC Canyon · Power Train · filed with NHTSA Jul 1, 2026 · ODI 11747612
The contact's husband owns a 2025 Chevrolet Colorado. The contact stated that after exiting a car wash tunnel and parking the vehicle on the side of the car wash building, the vehicle continued to roll forward at a high speed without warning.
2025 Chevrolet Colorado · Power Train · filed with NHTSA Jun 22, 2026 · ODI 11745625
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 group97 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 |
|---|---|---|---|
| N252502891-01 | Service campaign | Aug 20, 2026 | Certain vehicles may have a condition in which the internal differential nut was cross threaded or missing during assembly. Dealers will rev… |
| N262556930-01 | Service campaign | Jun 17, 2026 | Certain vehicles may have a condition in which the transfer case drive chain sprocket is cracked. Dealers are to replace the transfer case. |
| N262556930 | Service campaign | Jun 2, 2026 | Certain vehicles may have a condition in which the transfer case drive chain sprocket is cracked. Dealers are to replace the transfer case. |
| N242454441 -03 | Service campaign | Oct 9, 2025 | Certain vehicles listed above, may have a condition where the transmission control valve has worn, resulting in a gradual loss of pressure w… |
| 25-NA-080 | Service bulletin | Sep 4, 2025 | This service bulletin provides a procedure to overhaul the control valve to replace a plate and worn down check ball to correct the customer… |
| N252494003-01 | Service campaign | Jun 26, 2025 | Certain vehicles listed above, may have a condition where the connecting rod and/or crankshaft engine components in these vehicles may have… |
| N242483540-01 | Service campaign | May 21, 2025 | Certain vehicles listed above may have a condition in which the transmission may not shift properly. Dealers are to replace the transmission… |
| 22-NA-182 | Service bulletin | May 16, 2025 | This service bulletin advises the technician to check if the transmission cooler lines are twisted to correct customer concerns of Harsh Shi… |
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 GMC, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM N252517790 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 N252517790 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 N252517790 cover?
The manufacturer filed it against 8 model years across 2 brands (Chevrolet and GMC): 2026 Chevrolet Colorado, 2025 Chevrolet Colorado, 2025 Chevrolet Express, 2025 Chevrolet Silverado, 2026 GMC Canyon, 2025 GMC Canyon and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.