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.
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 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, ignition ON.
2. Verify a test lamp illuminates between the appropriate low reference circuit terminal listed below and B+.
* Terminal 2 - with MH8/MH9
* Terminal A - with M26/MZ4
• If the test lamp does not illuminate
1. Ignition OFF, disconnect the X1 harness connector at the K9 body control module.
2. Test for less than 2 ohms in the low reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If the test lamp illuminates
3. Ignition ON.
4. Test for 4.8-5.2 V between the appropriate 5 V reference circuit terminal listed below and ground.
* Terminal 1 - with MH8/MH9
* Terminal C - with M26/MZ4
• If less than 4.8 V
1. Ignition OFF, disconnect the X2 harness connector at the K9 body control module.
2. Test for infinite resistance between the 5 V reference circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the 5 V reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If greater than 5.2 V
1. Ignition OFF, disconnect the X2 harness connector at the K9 body control module, ignition ON.
2. Test for less than 1 V between the 5 V reference circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 body control module.
• If between 4.8-5.2 V
5. Verify the scan tool Brake Pedal Applied parameter is Inactive.
• If not Inactive
1. Ignition OFF, disconnect the X2 harness connector at the K9 body control module, ignition ON.
2. Test for less than 1 V between the appropriate signal circuit terminal listed below and ground.
* Terminal 3 - with MH8/MH9
* Terminal B- with M26/MZ4
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 body control module.
• If Active
6. Install a 3 A fused jumper wire between the appropriate 5-volt reference and signal circuit terminals listed below.
* 5 V reference terminal 1 and signal terminal 3 - with MH8/MH9
* 5 V reference terminal C and signal terminal B - with M26/MZ4
7. Verify the scan tool Brake Pedal Applied parameter is Active.
• If not Active
1. Ignition OFF, disconnect the X2 harness connector at the K9 body control module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If Active
8. Test or replace the B22 brake pedal position sensor.
DTC C0277 4B
1. Verify DTC C0277 4B is not set.
• If DTC C0277 4B is set
1. Ignition ON
2. Perform the BPP sensor recalibration procedure for the K9 body control module. Refer to Brake Pedal Position Sensor Calibration .
3. Verify the DTC does not reset while operating the vehicle under the conditions for running the DTC.
• If the DTC resets, replace the B22 brake pedal position sensor.
• If the DTC does not reset
4. All OK.
• If DTC C0277 4B is not set
2. All OK.
DTC C0277 09
1. Verify DTC C0277 09 is not set.
• If DTC C0277 09 is set
1. Replace the B22 brake pedal position sensor.
2. Perform the BPP sensor recalibration procedure for the K9 body control module. Refer to Brake Pedal Position Sensor Calibration .
3. Verify the DTC does not reset while operating the vehicle under the conditions for running the DTC.
• If the DTC resets, replace the K9 body control module.
• If the DTC does not reset
4. All OK.
• If DTC C0277 09 is not set
2. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Brake Pedal Position Sensor Calibration
* Brake Pedal Position Sensor Replacement
* Control Module References Control Module References for BCM replacement, programming, and setup