Diagnostic Aids

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

DTC P1B12 is an informational DTC.
Diagnose other DTCs first.
Verify the following control modules contain the latest software:K17 Electronic Brake Control Module & K20 Engine Control Module
Inspect the serial data circuits and connections at the power steering control module and the electronic brake control module. They should be free from sources of electromagnetic interference and the connections should be clean and tight.