Service Information

Volt

DTC P1B12

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for a overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P1B12: Driver Intended Brake Torque Fault

The electronic brake control module (EBCM) monitors the brake pedal position sensor in order to provide emission related brake pedal position information to the engine control module (ECM). The EBCM sends the information, via the serial data circuit, to the ECM in a continuously repeating series of 16 rolling counts, with each count assigned a value. When the ECM determines that too many of the counts have an incorrect value, the ECM sets DTC P1B12.

Conditions for Running the DTC

•	The propulsion system is active.

•	DTC P1B12 runs continuously when the above condition is met.

Conditions for Setting the DTC

The ECM detects that 10 of the 16 rolling counts have an incorrect value.

Action Taken When the DTC Sets

DTC P1B12 is a Type C DTC.

Conditions for Clearing the DTC

DTC P1B12 is a Type C DTC.

Reference Information

Description and Operation

Hybrid Modes of Operation Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information.

Circuit/System Verification

Note: Correct any engine control DTCs before diagnosing EBCM DTCs.

DTC P1B12 is an informational DTC. If there are no other engine control DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for diagnosis of EBCM DTCs.
Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.