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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 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

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 left and right stop lamp control circuits as well as the center high mounted stop lamp (CHMSL) control circuit illuminating the left and right stop lamps and the CHMSL.

Conditions for Running the DTC

* Battery voltage must be between 9-16 V.
* Brakes APPLIED.

Conditions for Setting the DTC

DTC C0277 06
* The BCM detects a short to ground or an open/high resistance in the BPP sensor 5 V reference circuit.
* The BCM detects a short to ground or an open/high resistance in the BPP sensor signal circuit.

DTC C0277 07
* The BCM detects a short to voltage in the BPP sensor 5 V reference circuit.
* The BCM detects a short to voltage in the BPP sensor signal circuit.
* The BCM detects an open/high resistance in the BPP sensor low reference circuit.

DTC C0277 09

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

DTC C0277 4B

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

DTC C0890 03
* The BCM detects a short to ground in the BPP sensor 5 V reference circuit.
* The BCM detects a short to ground or an open/high resistance in the F23DA (BCM 1) fuse B+ circuit.

DTC C0890 07
* The BCM detects a short to voltage in the BPP sensor 5 V reference circuit.
* The BCM detects a short to voltage in the BPP sensor low reference circuit.

Actions Taken When the DTC Sets

* The Traction Control indicator is commanded ON.
* 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
Connector End View Reference

Component Connector End Views Sunshade - Left (D6I)
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 appropriate low reference circuit terminal listed below:

* Automatic transmission - terminal 2
* Manual transmission - terminal A

• 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.

3. Ignition ON, test for 4.8-5.2 V between the appropriate 5 V reference circuit terminal listed below and ground:

* Automatic transmission - terminal 1
* Manual transmission - terminal C

• 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.

4. Verify the scan tool Brake Pedal Applied parameter is Inactive.

• If not the specified value, test the appropriate signal circuit listed below for a short to voltage. If the circuit tests normal, replace the K9 BCM.

* Automatic transmission - terminal 3
* Manual transmission - terminal B

5. Ignition OFF, Install a 3 A fused jumper wire between the appropriate 5-volt reference and signal circuit terminals listed below:

* Automatic transmission - 5 V reference circuit terminal 1 and signal circuit terminal 3.
* Manual transmission - 5 V reference circuit terminal C and signal circuit terminal B.

6. Ignition ON, verify the scan tool Brake Pedal Applied parameter is Active.

• If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.

7. If all circuits test normal, replace the B22 brake pedal position sensor.

DTC C0277 4B
1. Verify that the DTC sets under the Conditions for Running and Setting.
2. Perform the brake pedal position sensor calibration 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 DTC C0277 4B resets as current, replace the B22 brake pedal position sensor.

DTC C0277 09
1. Replace the brake pedal position sensor.
2. Perform the brake pedal position sensor calibration 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 DTC C0277 09 resets as current, replace the K9 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, setup, and programming

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