C12A7

DTC C012F, C12A7, C12DC, or C12DD

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors
DTC C012F 00
- Brake Boost Solenoid Valve Circuit

DTC C012F 0E
- Brake Boost Solenoid Valve Circuit Resistance Below Threshold

DTC C12A7
- ABS Brake Boost Solenoid Valve Circuit Performance

DTC C12DC
- ABS Brake Boost Solenoid Valve Circuit Malfunction

DTC C12DD
- ABS Brake Boost Solenoid Valve Circuit Shorted

Circuit/System Description

The electronic brake control module (EBCM) uses input from the boost pressure sensor for more accurate control during brake and vehicle stability enhancement system event. The boost pressure sensor is internal to the brake pressure modulator valve.

Conditions for Running the DTC

* The ignition is ON.
* Ignition voltage is greater than 10 volts.

Conditions for Setting the DTC

C012F 00, C12A7, C12DC

Solenoid feedback current greater than 25% of commanded current.

C012F 0E, C12DD

Solenoid feedback current greater than 50% of requested current.

Action Taken When the DTC Sets

* The EBCM disables the ABS and vehicle stability enhancement system for the duration of the ignition cycle.
* A driver information center message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

* The condition for setting the DTC is no longer present.
* The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Reference Information
Schematic Reference

Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems
Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1 A4
Description and Operation

ABS Description and Operation Description and Operation
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

Verify that DTC C012F, C12A7, C12DC, or C12DD is not set.

If DTC is set replace Q5 brake pressure modulator valve assembly and verify the DTC does not reset. If DTC resets, replace the K17 EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Electronic Brake Control Module with Brake Pressure Modulator Valve Replacement Electronic Brake Control Module with Brake Pressure Modulator Valve Replacement
* Control Module References Control Module References for EBCM replacement, programming and setup