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C12D7




DTC C056D, C121C-C121F, C123A-C1256, C126E-C127D, C12C2-C12DF, or C12F2-C12F6

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 provide an overview of each diagnostic category.

DTC Descriptors
DTC C056D 00
- ECU Hardware Performance Malfunction

DTC C056D 3C
- ECU Hardware Performance Internal Communication Malfunction

DTC C121C 00
- Electronic Brake Control Module Internal Communication Malfunction

DTC C121D 00
- Electronic Brake Control Module Internal Malfunction

DTC C121E 00
- Electronic Brake Control Module Malfunction

DTC C121F 00
- Electronic Brake Control Module Supervision Software Malfunction

DTC C123A 00
- Electronic Brake Control Module RAM Watchdog

DTC C123B 00
- Electronic Brake Control Module RAM Program Overflow

DTC C123C 00
- Electronic Brake Control Module RAM Malfunction

DTC C123D 00
- Electronic Brake Control Module Solenoid Valve Timeout

DTC C123E 00
- Electronic Brake Control Module RAM Periodic Interrupt

DTC C123F 00
- Electronic Brake Control Module Serial Peripheral Interface Malfunction

DTC C1255 00
- Electronic Control Unit Performance

DTC C1256 00
- Control Module Programming Checksum Error

DTC C126E 00
- Electronic Brake Control Module Supervision Software Malfunction

DTC C126F 00
- Electronic Brake Control Module Serial Peripheral Interface Performance

DTC C127A 00
- Electronic Brake Control Module RAM Performance

DTC C127B 00
- Electronic Brake Control Module Processor Performance

DTC C127C 00
- Electronic Brake Control Module Self Test Malfunction

DTC C127D 00
- Electronic Brake Control Module Internal Malfunction

DTC C12C2 00
- ABS Left Front Isolation Solenoid Valve Driver Shorted

DTC C12C5 00
- ABS Right Front Isolation Solenoid Valve Diver Shorted

DTC C12CC 00
- ABS Left Front Dump Solenoid Valve Driver Shorted

DTC C12CF 00
- ABS Right Front Dump Solenoid Valve Driver Shorted

DTC C12D0 00
- ABS Left Rear Dump Solenoid Valve Circuit Open

DTC C12D1 00
- ABS Left Rear Dump Solenoid Valve Circuit Shorted

DTC C12D2 00
- ABS Left Rear Dump Solenoid Valve Driver Shorted

DTC C12D3 00
- ABS Right Rear Dump Solenoid Valve Circuit Open

DTC C12D4 00
- ABS Right Rear Dump Solenoid Valve Circuit Shorted

DTC C12D5 00
- ABS Right Rear Dump Solenoid Valve Driver Shorted

DTC C12D6 00
- ABS Base Brake Open Solenoid Valve Circuit Open

DTC C12D7 00
- ABS Base Brake Open Solenoid Valve Circuit Shorted

DTC C12D8 00
- ABS Base Brake Open Solenoid Valve Driver Shorted

DTC C12D9 00
- ABS Base Brake Closed Solenoid Valve Circuit Open

DTC C12DA 00
- ABS Base Brake Closed Solenoid Valve Circuit Shorted

DTC C12DB 00
- ABS Base Brake Closed Solenoid Valve Driver Shorted

DTC C12DF 00
- Dynamic Rear Proportioning Solenoid Valve Driver Shorted

DTC C12F2 00
- ABS Left Rear Isolation Solenoid Valve Circuit Shorted

DTC C12F3 00
- ABS Left Rear Isolation Solenoid Valve Performance

DTC C12F4 00
- Dynamic Rear Proportioning Solenoid Valve Performance

DTC C12F5 00
- ABS Right Rear Isolation Solenoid Valve Circuit Shorted

DTC C12F6 00
- ABS Right Rear Isolation Solenoid Valve Performance

Diagnostic Fault Information






Circuit/System Description

The electronic brake control module detects an internal malfunction.

Conditions for Running the DTC

* Vehicle ON or Vehicle in Service Mode.
* Ignition voltage is between 8 V and 16 V.

Conditions for Setting the DTC

* An open electronic brake control module ground circuit.
* The electronic brake control module detects an internal malfunction.

Action Taken When the DTC Sets

* The ABS indicator turns ON.
* The red brake indicator turns ON.
* The traction control/stability control indicator turns ON.
* The Service Brake Assist and Service StabiliTrak messages are displayed on the driver information center.
* The electronic brake control module disables the antilock brake system, the traction control system and the electronic stability program for the duration of the drive cycle.

Conditions for Clearing the DTC

* The condition for setting the DTC is no longer present.
* The history DTC will clear after 40 consecutive fault-free drive cycles have occurred.

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
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 Programming and Relearning for scan tool information

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the K17 electronic brake control module. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohm between each ground circuit terminal listed below and ground:

* Terminal 13
* Terminal 38

• If 10 ohm or greater

1. Vehicle OFF.
2. Test for less than 2 ohm in the ground circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, repair the open/high resistance in the ground connection.

• If less than 10 ohm

3. Vehicle in Service Mode.
4. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.

• If the test lamp does not illuminate and the circuit fuse is good

1. Vehicle OFF.
2. Test for less than 2 ohm in the B+ circuit end to end.

• If 2 ohm or greater, repair the open/high resistance the in the circuit.
• If less than 2 ohm, verify the fuse is not open and there is voltage at the fuse.

• If the test lamp does not illuminate and the circuit fuse is open

1. Vehicle OFF.
2. Test for infinite resistance between the B+ circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K17 electronic brake control module.

• If the test lamp illuminates

5. Replace the K17 electronic brake control module.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Control Module References Programming and Relearning for electronic brake control module replacement, programming and setup

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