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Service bulletin 21NA091

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 id10205548
Published by NHTSA2021-12-27
Manufacturer's number21NA091
Manufacturer's date2021-11-17
NHTSA componentBACK OVER PREVENTION; EQUIPMENT

NHTSA's summary

This service bulletin provides information for customers/dealers/technicians on Normal Rearview Camera Display Operation - Flashing Diamond - Spot - or UFO like image on Rear View Camera Display.

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

Driver assistance, Equipment and accessories, Backup camera

Vehicles listed
CADILLAC CT42020
CADILLAC CT52020, 2021
CADILLAC ESCALADE2020
CADILLAC ESCALADE ESV2020, 2021
CADILLAC ESCALADE NA2021 (the catalog's model; the bulletin names a series or trim of it)
CADILLAC XT42020, 2021
CHEVROLET 35002020
CHEVROLET 35002021
CHEVROLET 35002022
CHEVROLET BOLT EV2020
CHEVROLET CORVETTE2020, 2021
CHEVROLET SILVERADO 15002020, 2021 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SILVERADO 25002020, 2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SUBURBAN2020, 2021
CHEVROLET TAHOE2020, 2021
GMC SIERRA 15002020, 2021 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 25002020, 2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 35002021, 2022 (the catalog's model; the bulletin names a series or trim of it)
GMC YUKON2020, 2021
GMC YUKON XL2020, 2021

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

Recalls for the same vehicles and component
22V8680002022-11-23. BACK OVER PREVENTION: SENSING SYSTEM: CAMERA

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
22-NA-0682025-02-28. Service bulletin. This technical bulletin provides repair information to correct a customer concern of Diagnostic Tips For Park Assist Off Message / Unwanted Or False Park Assist Alerts / No DTCs.
PIT5907D2024-12-16. Service bulletin. This Preliminary information communicates a issue where the park assist module can set current communication dtc's due to a timing issue and it may have nothing related to the customers complaint. A software update will be available to repair these false DTC's
PIT5697D2024-12-09. Service bulletin. This Preliminary information communication provides information to the technician on installing Regular Production Option Code UVC Rearview Camera. Technician will need to reference the latest version of General Motors Up-fitter Integration Bulletin 152. The information can be found at http://www.gmupfitter.com/ under the "Technical Bulletin" Tab and then "Show all bulletins."
PIT62892024-12-04. Service bulletin. This Preliminary information communicates information that Engineering is aware of a concern where the collision / detection alert changes from audible beep to haptic feedback on its own and are working on a repair.
23-NA-0842024-08-15. Service bulletin. This service bulletin provides repair information to correct a customer concern of a Blue Hourglass and No Gridlines on Radio Rear View Camera Display While in Reverse.
23-NA-1692024-03-06. Service bulletin. This service bulletin provides repair information to correct a customer concern of the rearview driver information camera intermittent in low light conditions - replace camera.
PIT5386J2024-01-29. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that are found to have a back-up alarm inoperative during the Pre-Delivery Inspection. On trucks equipped with the Back Up Alarm (RPO 8S3), the alarm will be intentionally left disconnected from the assembly plant. Technician will reroute the harness and plug it in.
PIP5847B2023-12-18. Service bulletin. This Preliminary information communicates the possibility of a misfire or rough running concern and abnormal engine noise due to excessive wear in exhaust roller follower axle pin.
PIT60872023-12-18. Service bulletin. This Preliminary information communicates the proper installation of the Left and Right Side Obstacle Detection Control Modules
N23-2411562023-10-05. Service bulletin. (There may be future updates under this same release number.) Your vehicle keeps getting better. This vehicle software update includes the following: Refinements: •Updates made to the overall vehicle software update process. Better Never Stops™