# Service bulletin 20NA157 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: 10181695 - Published by NHTSA: 2020\-10\-26 - Manufacturer's number: 20NA157 - Manufacturer's date: 2020\-09\-17 - NHTSA component: EQUIPMENT; ELECTRICAL SYSTEM ## NHTSA's summary This bulletin provides information on the Transport Mode On Message Being Displayed in the Driver Information Center \(DIC\) and/or Battery Light is Flashing and the procedures to turn the Transport Mode message ON and OFF. ## The document - [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10181695-0001.pdf) - [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10181695-9999.pdf) The document is the manufacturer's. This site does not hold it. ## Components Electrical system, Equipment and accessories ## Vehicles listed - 2013 to 2021 BUICK ENCORE - 2020 to 2021 BUICK ENCORE GX - 2016 to 2021 BUICK ENVISION - 2019 to 2020 BUICK REGAL - 2020 to 2021 CADILLAC CT4 - 2020 to 2021 CADILLAC CT5 - 2016 to 2020 CADILLAC CT6 - 2015 to 2020 CADILLAC ESCALADE - 2015 to 2016 CADILLAC ESCALADE ESV - 2017 to 2020 CADILLAC ESCALADE ESV - 2019 to 2021 CADILLAC XT4 - 2017 to 2021 CADILLAC XT5 - 2020 to 2021 CADILLAC XT6 - 2019 to 2021 CHEVROLET BLAZER - 2017 to 2021 CHEVROLET BOLT EV - 2016 to 2021 CHEVROLET CAMARO - 2015 to 2021 CHEVROLET COLORADO - 2020 CHEVROLET CORVETTE - 2018 to 2021 CHEVROLET EQUINOX - 2014 to 2020 CHEVROLET IMPALA - 2016 to 2021 CHEVROLET MALIBU - 2015 to 2021 CHEVROLET SILVERADO 1500 - 2015 to 2021 CHEVROLET SILVERADO 2500 - 2019 CHEVROLET SILVERADO 4500 - 2012 to 2020 CHEVROLET SONIC - 2013 to 2020 CHEVROLET SPARK - 2014 to 2017 CHEVROLET SPARK EV - 2015 to 2021 CHEVROLET SUBURBAN - 2015 to 2021 CHEVROLET TAHOE - 2020 CHEVROLET TRAILBLAZER - 2021 CHEVROLET TRAILBLAZER - 2013 to 2020 CHEVROLET TRAX - 2017 to 2019 GMC ACADIA - 2021 GMC ACADIA - 2015 to 2019 GMC CANYON - 2021 GMC CANYON - 2019 GMC SIERRA 1500 - 2021 GMC SIERRA 1500 - 2015 to 2019 GMC SIERRA 2500 - 2021 GMC SIERRA 2500 - 2015 to 2019 GMC SIERRA DENALI - 2018 to 2019 GMC TERRAIN - 2021 GMC TERRAIN - 2015 to 2019 GMC YUKON - 2021 GMC YUKON - 2015 to 2019 GMC YUKON XL - 2021 GMC YUKON XL ## Recalls for the same vehicles and component - [2024294](/recalls/tc/2024294.md), 2024-05-24: Electrical - [2022160](/recalls/tc/2022160.md), 2022-03-31: Accessories - [2021407](/recalls/tc/2021407.md), 2021-07-01: Electrical - [21V497000](/recalls/nhtsa/21V497000.md), 2021-07-01: EQUIPMENT:OTHER:LABELS - [21V496000](/recalls/nhtsa/21V496000.md), 2021-07-01: EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER - [2021365](/recalls/tc/2021365.md), 2021-06-10: Accessories - [21V440000](/recalls/nhtsa/21V440000.md), 2021-06-10: EQUIPMENT:MECHANICAL:ACCESSORY SCISSOR/SCREW/BOTTLE JACK/LIFT:STAND - [21V421000](/recalls/nhtsa/21V421000.md), 2021-06-10: AIR BAGS:SRS MALFUNCTION WARNING LAMP/LIGHT; ELECTRICAL SYSTEM:SOFTWARE - [20V489000](/recalls/nhtsa/20V489000.md), 2020-08-18: ELECTRICAL SYSTEM:SOFTWARE; STRUCTURE:BODY:TRUNK LID - [20V461000](/recalls/nhtsa/20V461000.md), 2020-08-06: ELECTRICAL SYSTEM:SOFTWARE; LATCHES/LOCKS/LINKAGES:TRUNK LID:LOCK ## 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. - [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. - [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. - [25\-NA\-106](/bulletins/11022031.md), 2025-08-21, Service bulletin: ELECTRICAL SYSTEM; VISIBILITY/WIPER. This Service Bulletin provides information on the rearview camera transitioning from Dark to light and the adjustment time period of 20 seconds. - [24\-NA\-068](/bulletins/11019547.md), 2025-06-16, Service bulletin: ENGINE; ELECTRICAL SYSTEM. This service bulletin provides a procedure to test and replace the battery distribution fuse block if found the cause of the DTC and electric coolant pump inoperative. - [24\-NA\-229](/bulletins/11019017.md), 2025-06-03, Service bulletin: ELECTRICAL SYSTEM. This bulletin provides a procedure on how to check for a battery drain utilizing the Picoscope and how to measure the load on the system that may be causing a drain. 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