Chevrolet Trax: DTC C0277 06, C0277 07, C0890 03, and C0890 07

1. Ignition OFF, disconnect the harness connector at the B22 Brake Pedal Position Sensor, ignition ON.
2. Verify a test lamp illuminates between the appropriate low reference circuit terminal listed below and B+.

• Terminal 2 - with MH8/MHB
• Terminal A - without MH8/MHB
• If the test lamp does not illuminate

1. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module.
2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 Body Control Module.
• If the test lamp illuminates

3. Ignition ON.
4. Test for 4.8-5.2 V between the appropriate 5 V reference circuit terminal listed below and ground.

• Terminal 1 - with MH8/MHB
• Terminal C - without MH8/MHB
• If less than 4.8 V

1. Ignition OFF, disconnect the X2 harness connector at the K9 Body 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 ohms in the 5 V reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 Body Control Module.
• If greater than 5.2 V

1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON.
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 K9 Body Control Module.
• If between 4.8-5.2 V

5. Verify the scan tool Brake Pedal Applied parameter is Inactive.

• If not Inactive

1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the appropriate signal circuit terminal listed below and ground.

• Terminal 3 - with MH8/MHB
• Terminal B - without MH8/MHB
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 Body Control Module.
• If Inactive

6. Install a 3 A fused jumper wire between the appropriate 5-volt reference and signal circuit terminals listed below.

• 5 V reference terminal 1 and signal terminal 3 - with MH8/MHB
• 5 V reference terminal C and signal terminal B - without MH8/MHB

7. Verify the scan tool Brake Pedal Applied parameter is Active.

• If not Active

1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the signal 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 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 Body Control Module.
• If Active

8. Test or replace the B22 Brake Pedal Position Sensor.

DTC C0277 4B

1. Verify DTC C0277 4B is not set.

• If DTC C0277 4B is set

1. Ignition ON
2. Perform the BPP sensor recalibration procedure for the K9 Body Control Module. Refer to Brake Pedal Position Sensor Calibration .
3. Verify the DTC does not reset while operating the vehicle under the conditions for running the DTC.

• If the DTC resets, replace the B22 Brake Pedal Position Sensor.
• If the DTC does not reset

4. All OK.

• If DTC C0277 4B is not set

2. All OK.

DTC C0277 09

1. Verify DTC C0277 09 is not set.

• If DTC C0277 09 is set

1. Replace the B22 Brake Pedal Position Sensor.
2. Perform the BPP sensor recalibration procedure for the K9 Body Control Module. Refer to Brake Pedal Position Sensor Calibration .
3. Verify the DTC does not reset while operating the vehicle under the conditions for running the DTC.

• If the DTC resets, replace the K9 Body Control Module
• If the DTC does not reset

4. All OK.

• If DTC C0277 09 is not set

2. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Brake Pedal Position Sensor Calibration
• Brake Pedal Position Sensor Replacement
• Control Module References for BCM replacement, programming, and setup

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