GM bulletin 25-NA-100
What it saysThis warranty administration bulletin provides policy information on vehicles outside of a California Emissions State who move to and register their vehicle in a California Emission State may be entitled to the 7 year… NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Apr 18, 2025, received Jun 12, 2025, about the engine. It names 370 model years across Chevrolet, GMC, Buick and Cadillac (2017–2026). 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 · Buick · Cadillac.
Get the next GM bulletin for your model by email Weekly, only when something new is filed. Nothing else; one-click unsubscribe.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis warranty administration bulletin provides policy information on vehicles outside of a California Emissions State who move to and register their vehicle in a California Emission State may be entitled to the 7 year, 70,000-mile Emission Select State Component Limited Warranty.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 25-NA-100 | Service bulletin | Apr 18, 2025 | 11019503 | PDF, 127 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 174 model years
and 118 more on this site: 2026 Chevrolet Equinox, 2025 Chevrolet Equinox, 2024 Chevrolet Equinox, 2023 Chevrolet Equinox, 2022 Chevrolet Equinox, 2021 Chevrolet Equinox, 2020 Chevrolet Equinox, 2019 Chevrolet Equinox, 2018 Chevrolet Equinox, 2017 Chevrolet Equinox, 2026 Chevrolet Express, 2025 Chevrolet Express, 2024 Chevrolet Express, 2023 Chevrolet Express, 2022 Chevrolet Express, 2021 Chevrolet Express, 2020 Chevrolet Express, 2019 Chevrolet Express, 2018 Chevrolet Express, 2017 Chevrolet Express, 2020 Chevrolet Impala, 2019 Chevrolet Impala, 2018 Chevrolet Impala, 2017 Chevrolet Impala, 2025 Chevrolet Malibu, 2024 Chevrolet Malibu, 2023 Chevrolet Malibu, 2022 Chevrolet Malibu, 2021 Chevrolet Malibu, 2020 Chevrolet Malibu, 2019 Chevrolet Malibu, 2018 Chevrolet Malibu, 2017 Chevrolet Malibu, 2017 Chevrolet SS, 2026 Chevrolet Silverado, 2025 Chevrolet Silverado, 2024 Chevrolet Silverado, 2023 Chevrolet Silverado, 2022 Chevrolet Silverado, 2021 Chevrolet Silverado, 2020 Chevrolet Silverado, 2019 Chevrolet Silverado, 2018 Chevrolet Silverado, 2017 Chevrolet Silverado, 2026 Chevrolet Silverado 2500HD, 2025 Chevrolet Silverado 2500HD, 2024 Chevrolet Silverado 2500HD, 2023 Chevrolet Silverado 2500HD, 2022 Chevrolet Silverado 2500HD, 2021 Chevrolet Silverado 2500HD, 2020 Chevrolet Silverado 2500HD, 2019 Chevrolet Silverado 2500HD, 2018 Chevrolet Silverado 2500HD, 2017 Chevrolet Silverado 2500HD, 2026 Chevrolet Silverado 3500HD, 2025 Chevrolet Silverado 3500HD, 2024 Chevrolet Silverado 3500HD, 2023 Chevrolet Silverado 3500HD, 2022 Chevrolet Silverado 3500HD, 2021 Chevrolet Silverado 3500HD, 2020 Chevrolet Silverado 3500HD, 2019 Chevrolet Silverado 3500HD, 2018 Chevrolet Silverado 3500HD, 2017 Chevrolet Silverado 3500HD, 2020 Chevrolet Sonic, 2019 Chevrolet Sonic, 2018 Chevrolet Sonic, 2017 Chevrolet Sonic, 2022 Chevrolet Spark, 2021 Chevrolet Spark, 2020 Chevrolet Spark, 2019 Chevrolet Spark, 2018 Chevrolet Spark, 2017 Chevrolet Spark, 2026 Chevrolet Suburban, 2025 Chevrolet Suburban, 2024 Chevrolet Suburban, 2023 Chevrolet Suburban, 2022 Chevrolet Suburban, 2021 Chevrolet Suburban, 2020 Chevrolet Suburban, 2019 Chevrolet Suburban, 2018 Chevrolet Suburban, 2017 Chevrolet Suburban, 2026 Chevrolet Tahoe, 2025 Chevrolet Tahoe, 2024 Chevrolet Tahoe, 2023 Chevrolet Tahoe, 2022 Chevrolet Tahoe, 2021 Chevrolet Tahoe, 2020 Chevrolet Tahoe, 2019 Chevrolet Tahoe, 2018 Chevrolet Tahoe, 2017 Chevrolet Tahoe, 2026 Chevrolet Trailblazer, 2025 Chevrolet Trailblazer, 2024 Chevrolet Trailblazer, 2023 Chevrolet Trailblazer, 2022 Chevrolet Trailblazer, 2021 Chevrolet Trailblazer, 2025 Chevrolet Traverse, 2024 Chevrolet Traverse, 2023 Chevrolet Traverse, 2022 Chevrolet Traverse, 2021 Chevrolet Traverse, 2020 Chevrolet Traverse, 2019 Chevrolet Traverse, 2018 Chevrolet Traverse, 2017 Chevrolet Traverse, 2026 Chevrolet Trax, 2025 Chevrolet Trax, 2024 Chevrolet Trax, 2022 Chevrolet Trax, 2021 Chevrolet Trax, 2020 Chevrolet Trax, 2019 Chevrolet Trax, 2018 Chevrolet Trax, 2017 Chevrolet Trax.
Also filed against model years this site has no page for: 2023 Chevrolet 4500HD; 2023 Chevrolet 5500HD; 2019 Chevrolet 6500; 2023 Chevrolet 6500HD; 2017 Chevrolet Caprice; 2018 Chevrolet Caprice; 2017 Chevrolet Caprice Police Pursuit; 2017 Chevrolet Captiva; 2018 Chevrolet Captiva; 2019 Chevrolet Duplicate Silverado 5500; 2018 Chevrolet G4500; 2017 Chevrolet Trailblazer; 2018 Chevrolet Trailblazer; 2019 Chevrolet Trailblazer; 2020 Chevrolet Trailblazer; 2023 Chevrolet Trax.
GMC 83 model years
and 72 more on this site: 2018 GMC Acadia, 2017 GMC Acadia, 2026 GMC Canyon, 2025 GMC Canyon, 2024 GMC Canyon, 2023 GMC Canyon, 2022 GMC Canyon, 2021 GMC Canyon, 2020 GMC Canyon, 2019 GMC Canyon, 2018 GMC Canyon, 2017 GMC Canyon, 2026 GMC Savana, 2025 GMC Savana, 2024 GMC Savana, 2023 GMC Savana, 2022 GMC Savana, 2021 GMC Savana, 2020 GMC Savana, 2019 GMC Savana, 2018 GMC Savana, 2017 GMC Savana, 2026 GMC Sierra, 2025 GMC Sierra, 2024 GMC Sierra, 2023 GMC Sierra, 2022 GMC Sierra, 2021 GMC Sierra, 2020 GMC Sierra, 2019 GMC Sierra, 2018 GMC Sierra, 2017 GMC Sierra, 2026 GMC Sierra 2500HD, 2025 GMC Sierra 2500HD, 2024 GMC Sierra 2500HD, 2023 GMC Sierra 2500HD, 2022 GMC Sierra 2500HD, 2021 GMC Sierra 2500HD, 2020 GMC Sierra 2500HD, 2019 GMC Sierra 2500HD, 2018 GMC Sierra 2500HD, 2017 GMC Sierra 2500HD, 2026 GMC Sierra 3500HD, 2025 GMC Sierra 3500HD, 2024 GMC Sierra 3500HD, 2023 GMC Sierra 3500HD, 2022 GMC Sierra 3500HD, 2021 GMC Sierra 3500HD, 2020 GMC Sierra 3500HD, 2019 GMC Sierra 3500HD, 2018 GMC Sierra 3500HD, 2017 GMC Sierra 3500HD, 2026 GMC Terrain, 2025 GMC Terrain, 2024 GMC Terrain, 2023 GMC Terrain, 2022 GMC Terrain, 2021 GMC Terrain, 2020 GMC Terrain, 2019 GMC Terrain, 2018 GMC Terrain, 2017 GMC Terrain, 2026 GMC Yukon, 2025 GMC Yukon, 2024 GMC Yukon, 2023 GMC Yukon, 2022 GMC Yukon, 2021 GMC Yukon, 2020 GMC Yukon, 2019 GMC Yukon, 2018 GMC Yukon, 2017 GMC Yukon.
Also filed against model years this site has no page for: 2024 GMC 3500HD; 2017 GMC G3500; 2018 GMC G3500.
Buick 45 model years
and 36 more on this site: 2021 Buick Enclave, 2020 Buick Enclave, 2019 Buick Enclave, 2018 Buick Enclave, 2017 Buick Enclave, 2026 Buick Encore, 2025 Buick Encore, 2024 Buick Encore, 2023 Buick Encore, 2022 Buick Encore, 2021 Buick Encore, 2020 Buick Encore, 2019 Buick Encore, 2018 Buick Encore, 2017 Buick Encore, 2026 Buick Envision, 2025 Buick Envision, 2024 Buick Envision, 2023 Buick Envision, 2022 Buick Envision, 2021 Buick Envision, 2020 Buick Envision, 2019 Buick Envision, 2018 Buick Envision, 2017 Buick Envision, 2026 Buick Envista, 2025 Buick Envista, 2024 Buick Envista, 2019 Buick LaCrosse, 2018 Buick LaCrosse, 2017 Buick LaCrosse, 2020 Buick Regal, 2019 Buick Regal, 2018 Buick Regal, 2017 Buick Regal, 2017 Buick Verano.
Also filed against model years this site has no page for: 2020 Buick Lacrosse.
Cadillac 68 model years
and 55 more on this site: 2023 Cadillac CT4, 2022 Cadillac CT4, 2021 Cadillac CT4, 2020 Cadillac CT4, 2026 Cadillac CT5, 2025 Cadillac CT5, 2024 Cadillac CT5, 2023 Cadillac CT5, 2022 Cadillac CT5, 2021 Cadillac CT5, 2020 Cadillac CT5, 2020 Cadillac CT6, 2019 Cadillac CT6, 2018 Cadillac CT6, 2017 Cadillac CT6, 2019 Cadillac CTS, 2018 Cadillac CTS, 2017 Cadillac CTS, 2018 Cadillac CTS-V, 2026 Cadillac Escalade, 2025 Cadillac Escalade, 2024 Cadillac Escalade, 2023 Cadillac Escalade, 2022 Cadillac Escalade, 2021 Cadillac Escalade, 2020 Cadillac Escalade, 2019 Cadillac Escalade, 2018 Cadillac Escalade, 2017 Cadillac Escalade, 2025 Cadillac XT4, 2024 Cadillac XT4, 2023 Cadillac XT4, 2022 Cadillac XT4, 2021 Cadillac XT4, 2020 Cadillac XT4, 2019 Cadillac XT4, 2026 Cadillac XT5, 2025 Cadillac XT5, 2024 Cadillac XT5, 2023 Cadillac XT5, 2022 Cadillac XT5, 2021 Cadillac XT5, 2020 Cadillac XT5, 2019 Cadillac XT5, 2018 Cadillac XT5, 2017 Cadillac XT5, 2025 Cadillac XT6, 2024 Cadillac XT6, 2023 Cadillac XT6, 2022 Cadillac XT6, 2021 Cadillac XT6, 2020 Cadillac XT6, 2019 Cadillac XTS, 2018 Cadillac XTS, 2017 Cadillac XTS.
Also filed against model years this site has no page for: 2021 Cadillac CT6; 2018 Cadillac XT4; 2026 Cadillac XT4; 2026 Cadillac XT6; 2020 Cadillac XTS.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
Email me new GM bulletins for one of these models
A weekly email, sent only in a week when GM files something new with NHTSA for the model you pick — service bulletins, campaigns, warranty extensions, over-the-air notices, every model year. Nothing else is sent; one-click unsubscribe in every message. Separate from recall alerts.
What owners reported
Source: NHTSA complaint databaseOwners of the 345 model years this bulletin names have filed 34,162 complaints with NHTSA since 2015. 11,090 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.
On the 2017 Chevrolet Malibu, the 147 owners who gave an odometer reading for Engine reported it at a median of 58,410 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
Dear GM Executive Office, I am writing in frustration and disappointment after being told today by Chevrolet Customer Assistance that the case I opened (Case # ) was simply a "dealer complaint" and that no further help would be offered - despite my vehicle exhibiting a recurring, safety-related malfunction covered under Special Coverage…
2018 Chevrolet Sonic · Engine · filed with NHTSA Jul 22, 2025
*takata recall* I have been noticing a lot of different issues with my 2017 Tahoe premier. The engine block is a deep rust color. Engine is extremely hot even hours later after parking. There is a thick black sludge that is on nearly every part under the truck. I started hearing a ticking noise that sped up as my driving speed increases.
2017 Chevrolet Tahoe · Engine · filed with NHTSA Aug 23, 2018
Transmission slipped almost from start. Took three appointments and two years - If my shop foreman knew the third time, why did he not call and tell me we now know your problem. I finally got fed up and brought it in one more time. Starter from day ONE maybe 50% of time made loud bang when Bendix retracted. Shop refused to take it off!!!
2018 GMC Canyon · Engine · filed with NHTSA Jan 1, 2022
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 group403 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 |
|---|---|---|---|
| N262570770-02 | Service campaign | Sep 25, 2026 | Certain vehicles may have a condition in which the thermal break tabs induce stress into the radiator causing a coolant leak. Dealers are to… |
| N262570770-01 | Service campaign | Sep 18, 2026 | Certain vehicles may have a condition in which the thermal break tabs induce stress into the radiator causing a coolant leak. Dealers are to… |
| N262570770 | Service campaign | Sep 15, 2026 | Certain vehicles may have a condition in which the thermal break tabs induce stress into the radiator causing a coolant leak. Dealers are to… |
| N242484750-02 | Warranty extension | Sep 1, 2026 | Special Coverage. Certain 2022 model year Buick Encore GX and Chevrolet Trailblazer vehicles, equipped with a 1.2L engine, may have a condi… |
| N242450640-02 | Warranty extension | Sep 1, 2026 | Special Coverage. Certain 2021 model year Buick Encore GX and Chevrolet Trailblazer vehicles, equipped with a 1.2L engine, may have a condi… |
| N232407740-03 | Warranty extension | Sep 1, 2026 | Special Coverage. Certain 2020 model year Buick Encore GX vehicles, equipped with a 1.2L engine, may have a condition that could cause the… |
| N262572131 | Service campaign | Aug 28, 2026 | Customer Satisfaction Program. Certain vehicles listed above may have a condition in which the oil galley in the cylinder head was not dril… |
| 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… |
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, Buick and Cadillac, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM 25-NA-100 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 25-NA-100 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.
Which vehicles does 25-NA-100 cover?
The manufacturer filed it against 370 model years across 4 brands (Chevrolet, GMC, Buick and Cadillac): 2019 Buick Cascada, 2018 Buick Cascada, 2017 Buick Cascada, 2026 Buick Enclave, 2025 Buick Enclave, 2024 Buick Enclave and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.