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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 Low Voltage/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 DTC will set when the BCM detects the brake pedal position sensor signal is changing faster than possible under normal operating conditions.

C0277 4B

The DTC will set when the brake pedal position sensor home position is not learned.

Action Taken When the DTC Sets

Brake lights always ON.

Conditions for Clearing the DTC

The condition for setting the DTC is not longer present.

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 Verification

Ignition ON, observe the scan tool Brake Switch parameter. The reading should be between Inactive/Active and change when the brake pedal is pushed or released.

Circuit/System Testing

C0277 06 or C0277 07
1. Ignition OFF, disconnect the harness connector at the B22 Brake Pedal Position Sensor.
2. Disconnect the negative terminal of the C1 Battery.
3. Ignition OFF, test for less than 5 ohm between the low reference circuit terminal C and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.

4. Reconnect the negative terminal to the C1 Battery.
5. 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 Body Control Module.
• 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 Body Control Module.

6. Test for less than 0.3 V between the signal circuit terminal B and ground.

• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.

7. Test for 4.8-5.2 V between the 5-volt reference circuit terminal A and the signal circuit terminal B.

• If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.

8. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module.
9. Test for infinite resistance between the signal circuit terminal B and ground.

• If less than the specified range, test the signal circuit for a short to ground.

10. If all circuits test normal, test or replace the B22 Brake Pedal Position Sensor.

C0277 09
1. If the DTC is set, replace the B22 Brake Pedal Position Sensor.
2. Perform the brake pedal position 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 Body Control Module.

C0277 4B

If the DTC is set, recalibrate the B22 Brake Pedal Position Sensor.

1. Verify that the DTC sets under the conditions for running and setting.
2. Perform the brake pedal position 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 B22 Brake Pedal Position Sensor.

Component Testing

Static Test
1. Ignition OFF, disconnect the harness connector at the B22 Brake Pedal Position Sensor.
2. Test for 2.7-3.1 kohm between the 5-volt reference terminal A and the low reference terminal C.

• If not within the specified range, replace the B22 Brake Pedal Position Sensor.

3. Sweep the sensor through the entire range while monitoring the resistance between the signal terminal B and the low reference terminal C. The resistance should vary between 1.5-2.3 kohm without any spikes or dropouts.

• If not within the specified range or is erratic, replace the B22 Brake Pedal Position Sensor.

Dynamic Test
1. Install a 3 A fused jumper wire between the 5-volt reference terminal A and 5 V. Install a jumper wire between the low reference terminal C and ground.
2. Sweep the sensor through the entire range while monitoring the voltage between the signal terminal B and the low reference terminal C. The voltage should vary between 0.8-2.1 V without any spikes or dropouts.

• If not within the specified range or is erratic, replace the B22 Brake Pedal Position Sensor.

Repair Instructions

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

* Brake Pedal Position Sensor Calibration ()
* Control Module References (Programming and Relearning) for BCM replacement, setup and programming

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