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DTC C0880, C12E5, or C120F

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

DTC Descriptors

DTC C0880 00: Control Module Voltage Reference Output 2 Circuit Malfunction

DTC C12E5 00: Brake Pedal Position Sensor Reference Circuit

DTC C0880 02: Control Module Voltage Reference Output 2 Circuit Short to Ground

DTC C120F 00: Brake Pedal Position Sensor Supply Circuit Low Input

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

5 V Reference

C0110 00, C0880 00, C0880 02, C029C 5A, C120F 00, C12E0. 00, C12E5 00

C0110 00,C029C 03, C029C 07, C029C 5A, C129A 00, C129E 00, C12E0 00

C0110 00, C0880 00, C029C 5A, C12E0 00, C12E5 00

C12B1 00, C12F8 00

Brake Pedal Travel Sensor 1 Signal Terminal 4

C029C 03, C129A 00

C0110 00, C0294 00, C029C 03, C029C 5A, C129A.00, C12E0 00, C12F8 00

C0110 00, C0880 00, C029C 5A, C12E0 00, C12E5 00

C12B1 00, C12F8 00

Brake Pedal Travel Sensor 2 Signal Terminal 6

C029C 03, C129D 00

C0110 00, C029C 07, C129E 00, C12E0 00

C0110 00, C029C 07, C129E 00, C12E0 00

C12B1 00, C12F8 00

Low Reference

-

C0110 00, C0294 00, C029C 07, C029C 5A, C129E 00, C12E0 00, C12F8 00

-

C12B1 00, C12F8 00

Circuit/System Description

The electronic brake control module supplies a 5 V reference to the brake control brake pedal position sensor.

Conditions for Running the DTC
    • Vehicle ON or Vehicle in Service Mode.
    • The ignition voltage is greater than 10 V.

Conditions for Setting the DTC
    • A short to ground or a short to voltage on the 5 V reference circuit to the brake control brake pedal position sensor.
    • A short to voltage on the sensor 1 signal circuit to the brake control brake pedal position sensor.

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 centre.
    • 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

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

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

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing
  1. Vehicle in Service Mode.
  2. Verify that DTC C029C is not set.
    3. ⇒If the DTC is set
        Refer to DTC C029C, C120C, C129A-C129F, C12B1, or C12F8 .
    ⇓   If the DTC is not set
  3. Vehicle OFF, disconnect the harness connector at the B201 brake control brake pedal position sensor.
  4. Test for less than 5 Ω between the low reference circuit terminal 1 and ground.
    5. ⇒If 5 Ω or greater
    4.1. Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module.
    4.2. Test for less than 2 Ω in the low reference circuit end to end.
    ⇒     If 2 Ω or greater, repair the open/high resistance in the circuit.
    ⇒     If less than 2 Ω, replace the K17 electronic brake control module.
    ⇓   If less than 5 Ω
  5. Vehicle in Service Mode.
  6. Test for 4.8-5.2 V between the 5 V reference circuit terminal 5 and ground.
    7. ⇒If less than 4.8 V
    6.1. Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module.
    6.2. Test for infinite resistance between the 5 V reference circuit and ground.
    ⇒     If less than infinite resistance, repair the short to ground on the circuit.
    ⇓     If infinite resistance
    6.3. Test for less than 2 Ω in the 5 V reference circuit end to end.
    ⇒     If 2 Ω or greater, repair the open/high resistance in the circuit.
    ⇒     If less than 2 Ω, replace the K17 electronic brake control module.
    ⇒If greater than 5.2 V
    6.1. Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module, vehicle in service mode.
    6.2. Test for less than 1 V between the 5 V reference circuit and ground.
    ⇒     If 1 V or greater, repair the short to voltage on the circuit.
    ⇒     If less than 1 V, replace the K17 electronic brake control module.
    ⇓   If between 4.8-5.2 V
  7. Verify the scan tool Brake Controls Brake Pedal Position Sensor Circuit 1 parameter is less than 1 V.
    8. ⇒If 1 V or greater
    7.1. Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module, vehicle in service mode.
    7.2. Test for less than 1 V between the signal circuit terminal 4 and ground.
    ⇒     If 1 V or greater, repair the short to voltage on the circuit.
    ⇒     If less than 1 V, replace the K17 electronic brake control module.
    ⇓   If less than 1 V
  8. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 5.
  9. Verify the scan tool Brake Controls Brake Pedal Position Sensor Circuit 1 parameter is greater than 4.5 V.
    10. ⇒If 4.5 V or less
    9.1. Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module.
    9.2. Test for infinite resistance between the signal circuit terminal 4 and ground.
    ⇒     If less than infinite resistance, repair the short to ground on the circuit.
    ⇓     If infinite resistance
    9.3. Test for less than 2 Ω in the signal circuit end to end.
    ⇒     If 2 Ω or greater, repair the open/high resistance in the circuit.
    ⇒     If less than 2 Ω, replace the K17 electronic brake control module.
    ⇓   If greater than 4.5 V
  10. Verify the scan tool Brake Controls Brake Pedal Position Sensor Circuit 2 parameter is greater than 80%.
    11. ⇒If 80% or less
    10.1. Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module.
    10.2. Test for infinite resistance between the signal circuit terminal 6 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 greater than 80%
  11. Install a 3 A fused jumper wire between the signal circuit terminal 6 and the low reference circuit terminal 1.
  12. Verify the scan tool Brake Controls Brake Pedal Position Sensor Circuit 2 is less than 10%.
    13. ⇒If 10% or greater
    12.1. Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module, vehicle in service mode.
    12.2. Test for less than 1 V between the signal circuit terminal 6 and ground.
    ⇒     If 1 V or greater, repair the short to voltage on the circuit.
    ⇓     If less than 1 V
    12.3. Vehicle OFF.
    12.4. Test for less than 2 Ω in the signal circuit end to end.
    ⇒     If 2 Ω or greater, repair the open/high resistance in the circuit.
    ⇒     If less than 2 Ω, replace the K17 electronic brake control module.
    ⇓   If less than 10%
  13. Replace the B201 brake control brake pedal position sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

    •  Electronic Brake Control Position Sensor Replacement
    • Control Module References for electronic brake control module replacement, programming and setup
   


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