GM service campaign N262546590-01
What it saysCertain vehicles listed above, may have a condition where coolant leaks from the radiator hose quick connect at the radiator inlet. NHTSA’s full summary ↓
GM filed this with NHTSA as a service campaign dated Jul 15, 2026, about the engine. It names 16 model years across Chevrolet, GMC and Buick (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 · Buick.
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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.
Certain vehicles listed above, may have a condition where coolant leaks from the radiator hose quick connect at the radiator inlet. This special coverage covers the condition described above for a period of 5 years or 60,000 miles (100,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after July 14, 2026, are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to July 14, 2026, must be submitted to the Service Contract provider. Vehicle owners or lessees who paid for repairs referenced in this Special Coverage (“Customers”) are eligible for reimbursement of their reasonable and customary expenses in accordance with the procedures specified below. The conditional right to reimbursement is provided by GM solely in the interest of customer satisfaction and is personal to Customers. Customers may not assign and GM does not consent to any assignment of any Customer’s right to submit reimbursement claims, or to receive reimbursement, or any other rights granted by this Special Coverage to any third party, including but not limited to service contract providers, and this Special Coverage is not intended to and does not confer any third party beneficiary, subrogation or contribution rights, or any other rights to reimbursement, against GM, whether in law, equity or otherwise, on any third parties. Dealers are to remove the inlet hose and replace the seal. The repairs will be made at no charge to the customer.
One of the 432 warranty extensions and special-coverage programs on file — every make, with the term each runs to.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| N262546590-01 | Service campaign | Jul 15, 2026 | 11035019 | PDF, 672 KB |
What the document itself lists
The manufacturer titles it “UPDATE: N262546590-01– Special Coverage”.
Parts the bulletin names
| Part number | Description | Qty |
|---|---|---|
| 86428206 | Radiator Lower Hose Seal | — |
| 12346290 | — | — |
| 10953464 | — | — |
Labour operations and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 9900968 | Customer Reimbursement Approved - For USA and Canada dealers only - For Export… | 0.2 hrs |
| 9900969 | Customer Reimbursement Denied – For USA dealers only N/A ZREG ** For USA and Canada… | 20 hrs |
Read by machine from the document NHTSA serves (11 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 7 model years
GMC 7 model years
Buick 2 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 16 model years this bulletin names have filed 1,137 complaints with NHTSA since 2015. 152 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.
Owned brand new vehicle for 48 hours. Fuel injector failure on cylinder 4 at 120 miles on the dash. Check engine light was on. Vehicle is currently at dealership. Engine unreliable/unsafe. Dealer confirmed. Dealer stated up to 10 days waiting on parts. Unknown if further damage has been caused. Wife states vehicle had a rough idle.
2025 Chevrolet Traverse · Engine · filed with NHTSA Mar 15, 2025 · ODI 11648441
The contact owns a 2025 GMC Canyon. The contact stated that while the vehicle was parked, the contact discovered a coolant leak underneath the front of the vehicle. No warning lights were illuminated. The vehicle was taken to a dealer to be diagnosed; however, the vehicle had not yet been diagnosed. The vehicle was not repaired.
2025 GMC Canyon · Engine · filed with NHTSA Jan 5, 2026 · ODI 11708852
2 incidents. 1. The blind spot indication (driver side) gives false readings sometimes. Will light up at various times in clear weather with no vehicle next to me. Sensors checked and were clean. 2. The vehicle had a dead battery. It was jumped by roadside assistance. When started, the vehicle had a check engine light.
2023 Chevrolet Colorado · Engine · filed with NHTSA Oct 14, 2023 · ODI 11549904
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 group118 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 Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| N262568830 | Service campaign | Aug 4, 2026 | Certain vehicles listed above may have a condition in which the oil filter was not adequately tightened. Dealers are to check and tighten th… |
| N252540910 | Service campaign | Feb 25, 2026 | Service Update. Certain vehicles listed above may have a condition in which a quality issue with the engine was identified. Dealers will re… |
| N252508350 | Service campaign | Oct 21, 2025 | Certain vehicles listed above, may have a condition that could cause the engine coolant thermostat to open at a lower temperature than inten… |
| N252503850 | Warranty extension | Jun 10, 2025 | Special Coverage. Certain vehicles listed above may have a condition that could cause the mounting bracket on the front exhaust pipe to sep… |
| 00-06-01-026R | Service bulletin | Jun 5, 2025 | This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage. |
| 25-NA-132 | Service bulletin | May 17, 2025 | This bulletin provides a procedure to verify a noise and replace the oil pump shaft assembly if the gears of the pump and balance shaft are… |
| PIE0840 | Service bulletin | May 16, 2025 | This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engine… |
| 24-NA-201 | Service bulletin | May 16, 2025 | This bulletin provides a procedure to replace the oil pump due to a loose drive pump gear not pressed on the pump shaft. |
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 Buick, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM N262546590-01 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 N262546590-01 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 N262546590-01 cover?
The manufacturer filed it against 16 model years across 3 brands (Chevrolet, GMC and Buick): 2026 Buick Enclave, 2025 Buick Enclave, 2026 Chevrolet Colorado, 2025 Chevrolet Colorado, 2024 Chevrolet Colorado, 2023 Chevrolet Colorado and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.