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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 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 lamps, center high mounted stop lamp (CHMSL), transmission control module (TCM), and engine control module (ECM).

Conditions for Running the DTC

* Battery voltage must be between 9-16 volts.
* 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-volt 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 a short to battery voltage in the brake pedal position sensor 5-Volt Reference circuit.

C0277 09

The BCM detects the brake pedal position sensor signal is changing faster than possible under normal operating conditions.

C0277 4B

The DTC will set when the brake pedal position sensor home position is not learned.

C0890 03

The BCM detects a short to ground in the brake pedal position sensor voltage reference circuit.

C0890 07

The BCM detects a short to battery voltage in the brake pedal position sensor voltage reference circuits.

Actions Taken When the DTC Sets

* The Service Vehicle Soon 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.

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.
* 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)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
* Connector Repairs (Connector 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 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 s short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

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 BCM.
• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the BCM.

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 BCM.

5. Install a 3A 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 BCM.

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.

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 for Running and Setting the DTC and verify the DTC does not reset.

• If the DTC resets, replace the brake pedal position 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

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