GM bulletin 18-NA-279
What it saysThis service bulletin provides information for dealers/technicians on the process to disable and enable passive unlocking. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Jul 26, 2024, received Feb 7, 2023, about the latches/locks/linkages — 4 documents under this number. It names 138 model years across Chevrolet, GMC, Buick and Cadillac (2019–2025). 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.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis service bulletin provides information for dealers/technicians on the process to disable and enable passive unlocking.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 18-NA-279 | Service bulletin | Jul 26, 2024 | 11006371 | PDF, 195 KB |
| 18-NA-279 | Service bulletin | Apr 26, 2024 | 11000120 | PDF, 612 KB |
| 18-NA-279 | Service bulletin | Feb 10, 2023 | 10232069 | PDF, 148 KB |
| 18-NA-279 | Service bulletin | Jan 20, 2023 | 10231364 | PDF, 112 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 60 model years
and 18 more on this site: 2020 Chevrolet Suburban, 2019 Chevrolet Suburban, 2023 Chevrolet Tahoe, 2022 Chevrolet Tahoe, 2021 Chevrolet Tahoe, 2020 Chevrolet Tahoe, 2019 Chevrolet Tahoe, 2023 Chevrolet Trailblazer, 2022 Chevrolet Trailblazer, 2021 Chevrolet Trailblazer, 2021 Chevrolet Traverse, 2020 Chevrolet Traverse, 2019 Chevrolet Traverse, 2022 Chevrolet Trax, 2021 Chevrolet Trax, 2020 Chevrolet Trax, 2019 Chevrolet Trax, 2019 Chevrolet Volt.
Also filed against model years this site has no page for: 2019 Chevrolet 6500; 2020 Chevrolet Trailblazer.
GMC 24 model years
and 15 more on this site: 2023 GMC Sierra 2500HD, 2022 GMC Sierra 2500HD, 2021 GMC Sierra 2500HD, 2020 GMC Sierra 2500HD, 2019 GMC Sierra 2500HD, 2023 GMC Sierra 3500HD, 2022 GMC Sierra 3500HD, 2021 GMC Sierra 3500HD, 2020 GMC Sierra 3500HD, 2019 GMC Sierra 3500HD, 2023 GMC Yukon, 2022 GMC Yukon, 2021 GMC Yukon, 2020 GMC Yukon, 2019 GMC Yukon.
Also filed against model years this site has no page for: 2022 GMC Hummer EV Pickup.
Buick 17 model years
and 8 more on this site: 2020 Buick Encore, 2019 Buick Encore, 2023 Buick Envision, 2022 Buick Envision, 2021 Buick Envision, 2020 Buick Envision, 2019 Buick Envision, 2019 Buick LaCrosse.
Also filed against model years this site has no page for: 2020 Buick Lacrosse.
Cadillac 37 model years
and 28 more on this site: 2021 Cadillac CT5, 2020 Cadillac CT5, 2020 Cadillac CT6, 2019 Cadillac CT6, 2023 Cadillac Escalade, 2022 Cadillac Escalade, 2021 Cadillac Escalade, 2020 Cadillac Escalade, 2019 Cadillac Escalade, 2024 Cadillac Lyriq, 2023 Cadillac Lyriq, 2022 Cadillac XT4, 2021 Cadillac XT4, 2020 Cadillac XT4, 2019 Cadillac XT4, 2025 Cadillac XT5, 2024 Cadillac XT5, 2023 Cadillac XT5, 2022 Cadillac XT5, 2021 Cadillac XT5, 2020 Cadillac XT5, 2019 Cadillac XT5, 2025 Cadillac XT6, 2024 Cadillac XT6, 2023 Cadillac XT6, 2022 Cadillac XT6, 2021 Cadillac XT6, 2020 Cadillac XT6.
Also filed against model years this site has no page for: 2023 Cadillac Redundant Lyriq.
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 133 model years this bulletin names have filed 16,373 complaints with NHTSA since 2015. 3,146 of them name Electrical System, Exterior Lighting, Latches/Locks/Linkages — 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 2019 Chevrolet Silverado, the 72 owners who gave an odometer reading for Electrical System reported it at a median of 11,750 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
In the early morning hours of october 21st, around 3am, we were woken up by smoke/fire alarms. We started running around our home to identify the cause of the alarm. After about 5 minutes of searching inside the home and finding nothing, we realized that there was some smell of smoke coming from the garage and when the mudroom door which…
2019 Chevrolet Bolt EV · Electrical System · filed with NHTSA Oct 30, 2020 · ODI 11372429
The entire left portion of the screen became inoperable and remained a black screen despite attempts to reset the system. The left side of the screen contains information such as gear selection, speedometer, lane keep assist, and many other important information. There is no other way to see what speed you are going besides this screen.
2023 Cadillac Lyriq · Electrical System · filed with NHTSA Dec 11, 2024 · ODI 11630145
There is a common and very dangerous electrical wire routing problem on my vehicle, along with 3 dozen others and my dads (separate but same truck) i confirmed with (FB group for owners of 17-19 L5P GMC diesel trucks) where the alternator positive wire from the alternator to the battery is run right along and across a rather sharp part…
2019 Chevrolet Silverado 3500HD · Electrical System · filed with NHTSA Oct 29, 2025 · ODI 11696384
In depth: 2020 Chevrolet Blazer electrical problems → · 2019 Chevrolet Blazer electrical problems → · 2020 Chevrolet Bolt EV electrical problems → · 2019 Chevrolet Bolt EV 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 latches/locks/linkages
Source: same model, same component group8 other manufacturer communications filed against these GM models under the same component group (latches/locks/linkages), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| N232428240 | Service campaign | Mar 12, 2025 | This message is to inform dealers that Customer Satisfaction Program N232428240, released on March 7, 2024 through GM GlobalConnect Message… |
| N232428240-03 | Service campaign | May 15, 2024 | Customer Satisfaction Program - Certain vehicles may have a condition in which the instrument panel center storage compartment does not func… |
| N232426401-01 | Service bulletin | Apr 25, 2024 | Customer Satisfaction Program. As a remedy for Safety Recall N232426400, certain vehicles had the liftgate exterior release switch assembly… |
| N232426401 | Service bulletin | Apr 24, 2024 | Customer Satisfaction Program. As a remedy for Safety Recall N232426400, certain vehicles had the liftgate exterior release switch assembly… |
| N242440290 | Service bulletin | Apr 18, 2024 | Service Update - Certain vehicles may have water intrusion in the liftgate and or rear cargo area. Dealers will inspect for water leak and… |
| PIC6521A | Service bulletin | Oct 11, 2023 | This Preliminary information communicates the direction a technician needs to take to correct the hands free liftgate operation. |
| PIC6521 | Service bulletin | Oct 2, 2023 | This Preliminary information communicates the direction a technician needs to take to verify operation of the hands free liftgate operation. |
| PIC6491A | Service bulletin | Jul 12, 2023 | This Preliminary information communicates That a service door latch system message maybe displayed with no related DTC's. |
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 18-NA-279 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 18-NA-279 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. Every GM warranty extension on file lists the ones GM has filed.
Which vehicles does 18-NA-279 cover?
The manufacturer filed it against 138 model years across 4 brands (Chevrolet, GMC, Buick and Cadillac): 2023 Buick Enclave, 2022 Buick Enclave, 2021 Buick Enclave, 2020 Buick Enclave, 2019 Buick Enclave, 2023 Buick Encore and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.