Conditions for Setting the DTC
WARNING: This page is about a different car, the 2016 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
B1446 03
The telematics communication interface control module detects that the backup power source voltage has dropped below the minimum threshold value.
B1447 04
The telematics communication interface control module detects no voltage from the backup power source.