C0277
DTC C0277
DTC DESCRIPTOR
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
DIAGNOSTIC FAULT INFORMATION
IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection
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 (BCM) provides a low reference signal and a 5-volt 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 positive voltage to the stop lamps, center high mounted stop lamp (CHMSL), transmission control module (TCM), and engine control module (ECM). The stop lamps will not operate unless the ignition is in the ON position.
CONDITIONS FOR RUNNING THE DTC
Battery voltage must be between 9-16 volts.
CONDITIONS FOR SETTING THE DTC
DTC C0277 06
This DTC will set when the BCM detects an open or short to ground in the brake pedal position sensor signal circuit for 0.5 second or greater.
DTC C0277 07
This DTC will set when the BCM detects the brake pedal position sensor signal or low reference circuits voltage is greater that 4.5 volts for 0.5 second or greater.
DTC C0277 09
This DTC will set when the BCM detects the brake pedal position sensor signal is changing faster than possible under normal operating conditions.
ACTION TAKEN WHEN THE DTC SETS
- The Service Vehicle Soon indicator is commanded ON.
- When DTC C0277 is set as current, the vehicle will not start.
- If the DTC sets while the vehicle is running, the BCM will activate the brake lights when the vehicles transmission is not in the PARK position and the vehicle is not accelerating.
CONDITIONS FOR CLEARING THE MIL/DTC
- The condition responsible for setting the DTC no longer exists.
- You issue a scan tool CLEAR DTCs command.
- A history DTC will clear once 50 malfunction-free ignition cycles have occurred.
- A DTC will not clear the current status until the next ignition cycle.
DIAGNOSTIC AIDS
IMPORTANT: The stop lamps will not illuminate unless the ignition is in the ON position. For more detailed information concerning stop lamp operation, refer to Exterior Lighting Systems Description and Operation.
If DTC C0277 09 is set, replace the brake pedal position sensor. If the DTC resets, replace the BCM.
CIRCUIT/SYSTEM TESTING
1. Ignition ON, use a scan tool to display DTCs for the BCM.
- If DTC C0277 06 is present, test the brake pedal position sensor signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the brake pedal position sensor.
- If DTC C0277 09 is present, replace the brake pedal position sensor.
2. Ignition OFF, disconnect the BCM C2 harness connector.
3. Verify that a test lamp does not illuminate between the brake pedal position sensor signal circuit and ground.
- If the test lamp illuminates, repair the brake pedal position sensor signal circuit or low reference circuit for a short to voltage. If the circuits test normal, replace the brake pedal position sensor.
4. If all circuits test normal, replace the BCM.
REPAIR INSTRUCTIONS
IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
- Control Module References for BCM replacement, setup, and programming
- Brake Pedal Position Sensor Calibration
- Brake Pedal Position Sensor Replacement