C12DF

DTC C056D, C120C, C121C, C121E, C121F, C123A-C123F, C1255, C1256, C126E, C126F, C127E, C12A7, C12C2, C12C5, C12C6, C12C8, C12CC, C12CF, or C12D0-C12DF

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provide an overview of each diagnostic category.

DTC Descriptors
DTC C056D 00
- Electronic Control Unit Hardware

DTC C056D 3C
- Electronic Control Unit Hardware Internal Communication Failure

DTC C120C
- Brake Pedal Position Sensor 4 Not Plausible

DTC C121C
- Electronic Brake Control Module Internal Communication Malfunction

DTC C121E
- Electronic Brake Control Module Malfunction

DTC C121F
- Electronic Brake Control Module Supervision Software Malfunction

DTC C123A
- Electronic Brake Control Module RAM Watchdog

DTC C123B
- Electronic Brake Control Module RAM Program Overflow

DTC C123C
- Electronic Brake Control Module RAM Malfunction

DTC C123D
- Electronic Brake Control Module Solenoid Valve Timeout

DTC C123E
- Electronic Brake Control Module RAM Periodic Interrupt

DTC C123F
- Electronic Brake Control Module Serial Peripheral Interface Malfunction

DTC C1255
- Electronic Control Unit Performance

DTC C1256
- Control Module Programming Checksum Error

DTC C126E
- Electronic Brake Control Module Supervision Software Malfunction

DTC C126F
- Electronic Brake Control Module Serial Peripheral Interface Performance

DTC C127E
- Electronic Brake Control Module High Temperature

DTC C12A7
- ABS Boost Valve Solenoid Circuit Performance

DTC C12C2
- ABS Left Front Isolation Solenoid Valve Driver Shorted

DTC C12C5
- ABS Right Front Isolation Solenoid Valve Driver Shorted

DTC C12C6
- ABS Left Rear Isolation Solenoid Valve Circuit Failure

DTC C12C8
- ABS Right Rear Isolation Solenoid Valve Circuit Failure

DTC C12CC
- ABS Left Front Dump Solenoid Valve Driver Shorted

DTC C12CF
- ABS Right Front Dump Solenoid Valve Driver Shorted

DTC C12D0
- ABS Left Rear Dump Solenoid Valve Circuit Open

DTC C12D1
- ABS Left Rear Dump Solenoid Valve Circuit Shorted

DTC C12D2
- ABS Left Rear Dump Solenoid Valve Driver Shorted

DTC C12D3
- ABS Right Rear Dump Solenoid Valve Circuit Open

DTC C12D4
- ABS Right Rear Dump Solenoid Valve Circuit Shorted

DTC C12D5
- ABS Right Rear Dump Solenoid Valve Driver Shorted

DTC C12D6
- ABS Normally Open Base Brake Solenoid Valve Circuit Open

DTC C12D7
- ABS Normally Open Base Brake Solenoid Valve Circuit Shorted

DTC C12D8
- ABS Normally Open Base Brake Solenoid Valve Driver Shorted

DTC C12D9
- ABS Normally Closed Base Brake Solenoid Valve Circuit Open

DTC C12DA
- ABS Normally Closed Base Brake Solenoid Valve Circuit Shorted

DTC C12DB
- ABS Normally Closed Base Brake Solenoid Valve Driver Shorted

DTC C12DC
- ABS Brake Boost Solenoid Valve Circuit Malfunction

DTC C12DD
- ABS Brake Boost Solenoid Valve Circuit Shorted

DTC C12DE
- Dynamic Rear Proportioning Solenoid Valve Circuit Open

DTC C12DF
- Dynamic Rear Proportioning Solenoid Valve Driver Shorted

Circuit/System Description

The electronic brake control module (EBCM) detects an internal malfunction.

Conditions for Running the DTC

* Ignition ON.
* Ignition voltage is greater than 10 V.

Conditions for Setting the DTC

The EBCM detects an internal malfunction.

Action Taken When the DTC Sets

* The EBCM disables the antilock brake system (ABS), traction control and the vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
* A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

* The condition for 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 (2 Mode Hybrid) (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

ABS Description and Operation (Antilock Brake System - Hybrid)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

Verify DTC C056D is not set.

If DTC is set, replace the EBCM.

Repair Instructions

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

Control Module References (Programming and Relearning) for EBCM replacement, setup, and programming