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Service bulletin 21NA145

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10200144
Published by NHTSA2021-08-09
Manufacturer's number21NA145
Manufacturer's date2021-06-21
NHTSA componentEQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT

NHTSA's summary

This service bulletin provides U157 software update information to correct customer concerns of radio Software related issues.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Equipment and accessories, Software

Vehicles listed
BUICK ENCLAVE2020, 2021
BUICK ENCORE GX2020
CADILLAC CT62020
CADILLAC XT42020
CADILLAC XT52020
CADILLAC XT62020
CHEVROLET BLAZER2020
CHEVROLET CAMARO2020
CHEVROLET SILVERADO 15002020 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SILVERADO 25002020 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SILVERADO 35002020 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET TRAILBLAZER2021
CHEVROLET TRAVERSE2020, 2021
GMC ACADIA2020
GMC SIERRA 15002020 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 25002020 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 35002020 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
PIT5954C2024-04-15. Service bulletin. This Preliminary information communicates a Radio software update resolution for OnStar LED Red And Wifi Hotspot Inoperative After Remote Vehicle Start concern.
20-NA-1322024-04-05. Service bulletin. This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements.
PIT5839C2023-02-13. Service bulletin. This Preliminary information communicates to GM dealers that the above mentioned concern is software related and that General Motors is working on a solution.
PIP5632G2023-01-30. Service bulletin. This Preliminary Information communication provides information to the technician that General Motors Technical Assistance Center may ask for Global Diagnostic System 2 Session Log. Technician will need use Global Diagnostic System 2 to send the session logs to General Motors Technical Assistance Center for further assistance on the vehicle in question.
PIP4902Q2023-01-30. Service bulletin. This Preliminary Information communication provides information to the technician that General Motors Technical Assistance Center may ask for Global Diagnostic System 2 Session Log. Technician will need use Global Diagnostic System 2 to send the session logs to General Motors Technical Assistance Center for further assistance on the vehicle in question.
PIP58142023-01-30. Service bulletin. This Preliminary information communicates that there some service parts released to dealers missing software.
21NA1272022-06-21. Service bulletin. This technical bulletin provides repair information to correct a customer concern of Head Up Display (HUD) Blank, Non-Responsive to Brightness, Aim, or Page Controls, DTC U1518 Set.
21NA0242022-06-21. Service bulletin. This technical bulletin provides repair information to correct a customer concern of Service Engine Soon MIL Illuminated with DTC P2B87 Set.
22-NA-0752022-04-15. Service bulletin. This technical bulletin provides repair information to correct a customer concern of software anomalies with the engine control module (ECM).
21NA2562022-02-14. Service bulletin. This service bulletin provides repair information for dealers/technicians to correct a customer concern of a Malfunction Indicator Lamp Illuminated with DTC P26BB Set.