C0890
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 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 Calibration Not Learned
DTC C0890 03
- Control Module Voltage Reference Output 3 Circuit Low Voltage
DTC C0890 07
- Control Module Voltage Reference Output 3 Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The brake pedal position (BPP) sensor is used to sense the action of the driver application of the brake pedal. The BPP 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 BPP 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 tail/stop and turn signal lamps and the center high mounted stop lamp. The BCM also applies battery voltage to the transmission control module (TCM) and engine control module (ECM) via the brake applied signal circuit.
Conditions for Running the DTC
* Battery voltage must be between 9-16 V.
* Brakes APPLIED.
Conditions for Setting the DTC
C0277 06
The BCM detects a short to ground or an open/high resistance in the BPP sensor signal circuit or the 5 V reference circuit.
C0277 07
The BCM detects a short to battery voltage in the BPP sensor signal circuit or the 5 V reference circuit.
C0277 09
The BCM detects the BPP sensor signal is changing faster than possible under normal operating conditions.
C0277 4B
The DTC will set when the BPP sensor home position is not learned.
C0890 03
The BCM detects a short to ground in the BPP sensor voltage reference circuit for 0.5 seconds or greater.
C0890 07
The BCM detects a short to battery voltage in the BPP sensor voltage reference circuits.
Actions Taken When the DTC Sets
* The Traction Control 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 BPPs.
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 BPP 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)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
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 (Programming and Relearning) for scan tool information
Circuit/System Testing
C0277 06, C0277 07, C0890 03, and C0890 07
1. Ignition OFF, disconnect the harness connector at the B22 BPP sensor.
2. Ignition OFF, test for less than 5 ohm between the ground circuit terminal C and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. 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 BCM.
4. 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 BCM.
• 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 BCM.
5. Verify the scan tool BPP Sensor parameter is less than 1 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 BCM.
6. 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 4 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 BCM.
7. If all circuits test normal, test or replace the B22 BPP sensor.
C0277 09
1. Replace the B22 BPP sensor.
2. Perform the BPP 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 BCM.
C0277 4B
1. Verify that the DTC sets under the Conditions for Running and Setting.
2. Perform the BPP 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 BPP sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Brake Pedal Position Sensor Replacement ()
* Brake Pedal Position Sensor Calibration ()
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming