Conditions for Setting the DTC
WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
DTC B15A8 11
The BCM detects a short to ground on control circuit 4783.
DTC B15A8 12
The BCM detects a short to voltage on control circuit 4783.
DTC B15A8 13
The BCM detects an open/high resistance control circuit 4783.