One problem related to rearview system braking has been reported for the 2021 Chevrolet Blazer. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2021 Chevrolet Blazer based on all problems reported for the 2021 Blazer.
The radio and all the sound notifications such as turn signals, emergency flashers, crash avoidance, cross traffic, lane departure, and the use of the emergency onstar system do not work. This has been addressed in gm service information #pit5971b: loss of audio and onstar led is red - (Apr 3, 2023) gm appears to be addressing this as an inconvenience of not having the entertainment of the radio and not the safety features associated with it. This also includes the use of hands-free cell phone.