C0277
DTC C0277
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
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 (BPP) 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 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 positive voltage to the stop lamps, transmission control module (TCM), engine control module (ECM), and stop lamp relay coil side. When the stop lamp relay receives battery voltage from the BCM, the relay coil is energized and the stop lamp relay switch contacts close applying battery voltage through the stop lamp fuse to illuminate the center high mounted stop lamp.
Conditions for Running the DTC
* Battery voltage must be between 9-16 V.
* Brakes applied.
Conditions for Setting the DTC
C0277 06
This DTC will set for the following conditions:
* 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
This DTC will set for the following conditions:
* 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.
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 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.
* 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
Connector End View Reference
Component Connector End Views Sunshade - Left (DH6)
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
C0277 06 and C0277 07
1. Ignition OFF, disconnect the harness connector at the brake pedal position sensor.
2. Ignition OFF, 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 an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
3. 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.
4. Verify the scan tool BPP Sensor parameter is less than 0.2 V.
• 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 Body Control Module.
5. Install a 3 A fused jumper wire between the signal circuit terminal B and the 5 V reference circuit terminal A. Verify the scan tool BPP Sensor parameter is greater than 4.75 V.
• 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, test or replace the brake pedal position sensor.
C0277 09
1. Replace the 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 BCM.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Brake Pedal Position Sensor Calibration
* Brake Pedal Position Sensor Replacement
* Control Module References Control Module References for BCM replacement, programming and setup