C12E5
DTC C0880, C12E5, or C120F
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 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/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 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 in Service Mode.
2. Verify that DTC C029C is not set.
• If the DTC is set
Refer to DTC C029C, C120C, C129A-C129F, C12B1, or C12F8 C029C.
• 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 ohm between the low reference circuit terminal 1 and ground.
• If 5 ohm or greater
1. Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module.
2. Test for less than 2 ohm in the low reference circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the K17 electronic brake control module.
• If less than 5 ohm
5. Vehicle in Service Mode.
6. Test for 4.8-5.2 V between the 5 V reference circuit terminal 5 and ground.
• If less than 4.8 V
1. Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module.
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
3. Test for less than 2 ohm in the 5 V reference circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the K17 electronic brake control module.
• If greater than 5.2 V
1. Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module, vehicle in service mode.
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.
• If 1 V or greater
1. Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module, vehicle in service mode.
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.
• If 4.5 V or less
1. Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module.
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
3. Test for less than 2 ohm in the signal circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, 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%.
• If 80% or less
1. Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module.
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%.
• If 10% or greater
1. Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module, vehicle in service mode.
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
3. Vehicle OFF.
4. Test for less than 2 ohm in the signal circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, 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 Verification Tests after completing the repair.
* Brake Control Brake Pedal Position Sensor Replacement
* Control Module References Programming and Relearning for electronic brake control module replacement, programming and setup