C0277
DTC C0277 or C0890
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 C0277 06
- Brake Pedal Position Sensor Circuit Short to Ground or Open
DTC C0277 07
- Brake Pedal Position Sensor Circuit High Voltage
DTC C0277 09
- Brake Pedal Position Sensor Circuit Too Fast Transitions
DTC C0277 4B
- Brake Pedal Position Sensor Circuit Calibration Not Learned
DTC C0890 03
- Control Module Voltage Reference Output 3 Circuit Low Voltage
DTC C0890 07
- Control Module Voltage Reference Output 3 Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module provides a low reference signal and a 5 V reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery voltage to the stop lamp control circuit and center high mounted stop lamp control circuit. When the control circuit is energized the stop lamps are illuminated.
Conditions for Running the DTC
* Battery voltage must be between 9-16 V
* Brakes applied
Conditions for Setting the DTC
C0277 06 or C0890 03
* The BCM detects a short to ground or an open/high resistance in the brake pedal position sensor signal circuit.
* The BCM detects a short to ground or an open/high resistance in the brake pedal position sensor 5 V reference circuit.
C0277 07 or C0890 07
* The BCM detects a short to battery voltage in the brake pedal position sensor signal circuit.
* The BCM detects an open/high resistance in the brake pedal position sensor low reference circuit.
C0277 09
The BCM detects the brake pedal position sensor signal is changing faster than possible under normal operating conditions.
C0277 4B
The brake pedal position sensor home position is not learned.
Action Taken When the DTC Sets
Brake lights will malfunction, the shift lock is inoperative, the service park brake system lamp illuminated in IPC, park brake will set but not disengage
Conditions for Clearing the DTC
* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will be a history DTC.
* A history DTC will clear after 50 ignition cycles.
Diagnostic Aids
C0277 4B
If the DTC is set, recalibrate the brake pedal position sensor.
C0277 09
If the DTC is set, replace the brake pedal position sensor. If the DTC resets, replace the BCM.
Reference Information
Schematic Reference
Exterior Lights Schematics (Exterior Lights Schematics)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
Exterior Lighting Systems Description and Operation (Exterior Lighting Systems)
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
C0277 06, C0277 07, C0890 03, C0890 07
1. Ignition OFF, disconnect the harness connector at the B22 brake pedal position sensor.
2. Ignition OFF, test for less than 60 ohm between the low reference circuit terminal C and ground.
• If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground.
• If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
• If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
4. Verify that the scan tool Brake Pedal Position Sensor parameter is less than 0.3 V.
• If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the K9 BCM.
5. Connect a 3 A fused jumper wire between the 5 V reference circuit terminal A and the signal circuit terminal B. Verify that the scan tool Brake Pedal Position Sensor parameter is 4.8-5.2 V
• If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
6. If all circuits test normal, test or replace the B22 brake pedal position sensor.
C0277 09
1. Replace the B22 BPP sensor.
2. Perform the BPP sensor recalibration procedure. Refer to Brake Pedal Position Sensor Calibration ().
3. Operate the vehicle within the Conditions for Running and Setting the DTC and verify the DTC does not reset.
• If the DTC resets, replace the K9 BCM.
C0277 4B
1. Verify that the DTC sets under the Conditions for Running and Setting.
2. Perform the BPP sensor recalibration procedure. Refer to Brake Pedal Position Sensor Calibration ().
3. Operate the vehicle within the conditions that the customer experienced and verify the DTC does not reset.
• If the DTC resets, replace the B22 BPP sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Brake Pedal Position Sensor Calibration ()
* Brake Pedal Position Sensor Replacement ()
* Control Module References (Programming and Relearning)for BCM replacement, programming and setup