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 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
-
Device Voltage Reference Output 3 Circuit Voltage Below Threshold
DTC C0890 07
-
Device Voltage Reference Output 3 Circuit Voltage Above Threshold
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 (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 voltage to the stop lamp control circuit illuminating the left and right stop lamps and the center high mounted stop lamp (CHMSL). The BCM also applies battery voltage to the engine control module (ECM) via the brake applied signal circuit.
Conditions for Running the DTC
* Battery voltage must be between 9-16 volts.
* Brakes APPLIED.
Conditions for Setting the DTC
DTC C0277 06
* 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-volt reference circuit.
DTC C0277 07
* The BCM detects a short to voltage in the brake pedal position sensor signal circuit.
* The BCM detects a short to voltage in the brake pedal position sensor 5-Volt Reference circuit.
DTC C0277 09
The BCM detects the brake pedal position sensor signal is changing faster than possible under normal operating conditions.
DTC C0277 4B
The DTC will set when the brake pedal position sensor home position is not learned.
DTC C0890 03
The BCM detects a short to ground in the brake pedal position sensor voltage reference circuit.
DTC C0890 07
The BCM detects a short to voltage in the brake pedal position sensor voltage reference circuits.
Actions Taken When the DTC Sets
* The ABS Fault indicator is commanded ON.
* 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.
* For DTC C0277 4B the stop lamps may not activate at the expected brake pedal positions.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* For DTC C0277 07 the ignition must be cycled before the code can be cleared.
* For DTC C0277 4B a successful brake pedal position sensor calibration has been performed.
* 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.
Reference Information
Schematic Reference
* Exterior Lights Schematics Exterior Lights Schematics
* Body Control System Schematics [1][2]Body Control Systems
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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 Control Module References for scan tool information
Circuit/System Testing
DTC C0277 06, C0277 07, C0890 03, and C0890 07
1. Ignition OFF, disconnect the harness connector at the B22 brake pedal position sensor.
2. Ignition ON, verify that a test lamp illuminates between B+ and the low reference circuit terminal C.
• If the test lamp does not illuminate, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 body control module.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground.
• If less than the specified range, test the 5-volt 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-volt reference circuit for a short to voltage. If the circuit tests normal, replace the K9 body control module.
4. Verify the scan tool BPP Sensor parameter is less than 100 counts.
• 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. Install a 3 A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal A. Verify the scan tool BPP Sensor parameter is greater than 400 counts.
• 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 body control module.
6. If all circuits test normal, replace the B22 brake pedal position sensor.
DTC C0277 09
1. 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.
DTC C0277 4B
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 that the customer experienced and verify the DTC does not reset.
• If the DTC resets, replace the B22 brake pedal position sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Stop Lamp Switch Replacement Service and Repair
* Brake Pedal Position Sensor Calibration
* Control Module References Control Module References for BCM replacement, setup, and programming