Diagnostic Instructions

DTC Descriptors

DTC C0277 06: Brake Pedal Position Sensor Circuit Short to Ground or Open

DTC C0277 07: Brake Pedal Position Sensor Circuit Voltage Above Threshold

DTC C0277 09: Brake Pedal Position Sensor Circuit Rate of Change Above Threshold

DTC C0277 4B: Brake Pedal Position Sensor Calibration Not Learned

DTC C0890 03: Voltage Below Threshold

DTC C0890 07: Voltage Above Threshold

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Brake pedal position sensor circuit	C0277 06	C0277 06	C0277 07	C0277 09 C0277 4B
Brake pedal position sensor 5-volt reference	C0890 03	C0890 03	C0890 07	C0890 03 C0890 07
Brake pedal position sensor low reference	C0890 03	C0890 03	C0890 07	C0890 03 C0890 07

Circuit/System Description

The body control module (BCM) applies a ground through the brake pedal position sensor (BPPS) low reference circuit to the BPPS. The BCM supplies a 5-volt reference through the brake sensor reference voltage circuit to the BPPS. When the brake pedal is being applied, the BPPS then sends a variable voltage through the brake sensor signal circuit to the BCM.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

C0277 06

The BCM detects an open or a short to ground on the BPPS circuit.

C0277 07

The BCM detects short to voltage on the BPPS circuit.

C0277 09

The BCM detects the BPPS reading is erroneous.

C0277 4B

The BCM detect that the BPPS is not calibrated.

C0890 03

The BCM detects a voltage that is lower then 5 volts on the BPPS 5-volt reference circuit.

C0890 07

The BCM detects a voltage that is greater then 5 volts on the BPPS 5-volt reference circuit.

Action Taken When the DTC Sets

The stop lamps will not function correctly.

Conditions for Clearing the DTC

The BCM clears these codes from current when the fault is removed from the system.

Diagnostic Aids

If DTC C0277 4B is set, perform the BPPS calibration. If the DTC resets, then perform the circuit/system testing.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

Lighting Systems Connector End Views

Electrical Information Reference

Scan Tool Reference

Circuit/System Verification

Ignition ON, press and release the brake pedal. The stop lamps should illuminate then go out.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the BPPS.
2. Connect a DMM between the BPPS 5-volt reference circuit and the negative terminal of the battery.
3. Ignition ON, test for 4.7-5.2 volts.

⇒	If less then 4.7 volts, test the BPPS 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the BCM.

⇒	If greater than 5.2 volts, test the BPPS 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the BCM.

4. Connect a DMM between the BPPS low reference circuit and the negative terminal of the battery.
5. Ignition ON, test for less than 0.1 volt.

⇒	If greater than 0.1 volt, test the BPPS low reference circuit for a short to voltage or an open/high resistance. If the circuit/connections test normal, replace the BCM.

6. Disconnect the DMM. Install a scan tool. Install a 3-amp fused jumper wire between the BPPS circuit and the BPPS 5-volt reference circuit.
7. Verify the scan tool brake pedal position sensor parameter is between 4.7-5.2 volts

⇒	If less then 4.7 volts, test the BPPS circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the BCM.

⇒	If greater than 5.2 volts, test the BPPS circuit for a short to voltage. If the circuit/connections test normal, replace the BCM.

8. If the voltage is correct and all circuits/connections test normal, replace the BPPS.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.