# Service bulletin 18NA279 A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned. - Type: Service bulletin - NHTSA id: 10199234 - Published by NHTSA: 2021\-07\-19 - Manufacturer's number: 18NA279 - Manufacturer's date: 2021\-05\-12 - NHTSA component: LATCHES/LOCKS/LINKAGES; ELECTRICAL SYSTEM ## NHTSA's summary This service bulletin provides information for dealers/technicians on the process to disable and enable passive unlocking. ## The document - [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10199234-0001.pdf) - [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10199234-9999.pdf) The document is the manufacturer's. This site does not hold it. ## Components Electrical system, Latches and locks ## Vehicles listed - 2019 to 2021 BUICK ENCLAVE - 2019 to 2021 BUICK ENCORE - 2020 to 2021 BUICK ENCORE GX - 2019 to 2021 BUICK ENVISION - 2019 BUICK LACROSSE - 2020 to 2021 CADILLAC CT4 - 2020 to 2021 CADILLAC CT5 - 2019 to 2020 CADILLAC CT6 - 2019 to 2020 CADILLAC ESCALADE - 2019 to 2021 CADILLAC ESCALADE ESV - 2021 CADILLAC ESCALADE NA - 2019 to 2021 CADILLAC XT4 - 2019 to 2021 CADILLAC XT5 - 2020 to 2021 CADILLAC XT6 - 2019 to 2021 CHEVROLET BLAZER - 2019 CHEVROLET BOLT EV - 2019 to 2021 CHEVROLET CAMARO - 2019 CHEVROLET CRUZE - 2019 to 2021 CHEVROLET MALIBU - 2019 to 2021 CHEVROLET SILVERADO 1500 - 2020 to 2021 CHEVROLET SILVERADO 2500 - 2020 to 2021 CHEVROLET SILVERADO 4500 - 2019 to 2021 CHEVROLET SPARK - 2019 to 2021 CHEVROLET SUBURBAN - 2019 to 2021 CHEVROLET TAHOE - 2021 CHEVROLET TRAILBLAZER - 2019 to 2021 CHEVROLET TRAVERSE - 2019 to 2021 CHEVROLET TRAX - 2019 CHEVROLET VOLT - 2020 to 2021 GMC ACADIA - 2019 to 2021 GMC SIERRA 1500 - 2020 to 2021 GMC SIERRA 2500 - 2019 to 2021 GMC YUKON - 2019 to 2021 GMC YUKON XL ## Recalls for the same vehicles and component - [24V060000](/recalls/nhtsa/24V060000.md), 2024-02-01: LATCHES/LOCKS/LINKAGES:TAILGATE:LATCH - [21V560000](/recalls/nhtsa/21V560000.md), 2021-07-23: ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY - [21V421000](/recalls/nhtsa/21V421000.md), 2021-06-10: AIR BAGS:SRS MALFUNCTION WARNING LAMP/LIGHT; ELECTRICAL SYSTEM:SOFTWARE - [20V790000](/recalls/nhtsa/20V790000.md), 2020-12-17: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL - [20V701000](/recalls/nhtsa/20V701000.md), 2020-11-13: ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY - [20V324000](/recalls/nhtsa/20V324000.md), 2020-06-04: LATCHES/LOCKS/LINKAGES:HOOD:LATCH; STRUCTURE:BODY:HOOD - [20V184000](/recalls/nhtsa/20V184000.md), 2020-03-26: LATCHES/LOCKS/LINKAGES:DOORS:LATCH - [20V142000](/recalls/nhtsa/20V142000.md), 2020-03-12: LATCHES/LOCKS/LINKAGES:HOOD:LATCH - [2019631](/recalls/tc/2019631.md), 2019-12-12: Electrical - [19V888000](/recalls/nhtsa/19V888000.md), 2019-12-12: ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES ## Other bulletins for the same vehicles and component - [N252515590](/bulletins/11027795.md), 2026-01-27, Service campaign: ELECTRICAL SYSTEM. Certain vehicles listed above, may have a condition in which the body\-to\-chassis ground strap may be corroded. Dealers will replace the ground strap. - [22\-NA\-007](/bulletins/11025552.md), 2025-11-15, Service bulletin: ENGINE; ELECTRICAL SYSTEM. This service bulletin provides procedures to correct customer concerns of Poor Engine Performance in Extremely Cold Weather Conditions, Charge Air Cooler \(CAC\) Icing \- Malfunction Indicator Lamp \(MIL\) Illuminated with DTCs P0299, P0234, P0236, P2227, P00C7 Set. - [24\-NA\-202](/bulletins/11024496.md), 2025-10-27, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This service bulletin provides dealers with Warranty Administration information on North American Charging Standard \(NACS\) DC Adapter Warranty Claim Information. - [23\-NA\-170](/bulletins/11024486.md), 2025-10-25, Service bulletin: ELECTRICAL SYSTEM; ENGINE. This bulletin advises the tech to inspect deeper into what may be to main cause of an engine failure. - [23\-NA\-201](/bulletins/11024378.md), 2025-10-21, Service bulletin: SERVICE BRAKES; ELECTRICAL SYSTEM; STEERING. This service bulletin advises the technician of a possible loose ground that may be causing customer concerns of Loss of Steering Assist and/or Loss of Brake Assist and Malfunction Indicator Lamp \(MIL\) Illuminated. - [23\-NA\-119](/bulletins/11024331.md), 2025-10-16, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN. This service bulletin provides service procedure information to correct a customer concern of Shift to Park Displayed on DIC When Vehicle is in\- Park, No Start \- DTC B000A Set. - [18\-NA\-180](/bulletins/11024324.md), 2025-10-16, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This Warranty Administration service bulletin provides Lithium\-Ion battery Exchange Process and Transaction Submission information. - [PIE0753I](/bulletins/11023388.md), 2025-09-30, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This engineering information \(EI\) will assist GM to recover a small number of electric vehicle battery packs from customer\-owned vehicles in the field for further engineering study and analysis. - [22\-NA\-161](/bulletins/11023368.md), 2025-09-27, Service bulletin: ELECTRICAL SYSTEM; VISIBILITY/WIPER. This informational bulletin provides information for dealers/technicians on power folding mirrors do not fold at the same speed. - [18\-NA\-180](/bulletins/11023365.md), 2025-09-26, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This Warranty Administration service bulletin provides Lithium\-Ion battery Exchange Process and Transaction Submission information. 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