Buick Regal: DTC C0277 or C0890
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- 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
1. Stop Lamps Malfunction
2. Center High Mounted Stop Lamp Malfunction
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 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 voltage to the left and right stop
lamp control circuits as
well as the center high mounted stop lamp control circuit illuminating the left
and right stop lamps and
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
DTC C0277 06
- The BCM detects a short to ground or an open/high resistance in the
brake pedal position sensor 5
V reference circuit.
- The BCM detects a short to ground or an open/high resistance in the
brake pedal position sensor
signal circuit.
DTC C0277 07
- The BCM detects a short to voltage in the brake pedal position sensor 5
V reference circuit.
- The BCM detects a short to 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.
DTC C0277 09
The BCM detects the brake pedal position sensor signal is changing faster
than possible under normal
operating conditions.
DTC C0277 4B
The DTC will set when the brake pedal position sensor home position is not
learned.
DTC C0890 03
The BCM detects a short to ground in the brake pedal position sensor 5 V
reference circuit.
DTC C0890 07
The BCM detects a short to voltage in the brake pedal position sensor 5 V
reference circuit.
The BCM detects a short to voltage in the brake pedal position 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 Wiring Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Testing
DTC C0277 or C0890
1. Ignition OFF, disconnect the harness connector at the B22 Brake Pedal
Position Sensor, ignition
ON.
2. Verify a test lamp illuminates between low reference circuit terminal 1 and
B+.
- If the test lamp does not illuminate
- Ignition OFF, disconnect the X1 harness connector at the K9 Body Control
Module.
- Test for less than 2 Ω in the low reference circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K9 Body Control Module.
- Go to next step: If the test lamp illuminates
3. Ignition ON.
4. Test for 4.8 - 5.2 V between 5 V reference circuit terminal 2 and ground.
- Ignition OFF, disconnect the X2 harness connector at the K9 Body Control
Module.
- 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.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in the 5 V reference circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K9 Body Control Module.
- Ignition OFF, disconnect the X2 harness connector at the K9 Body Control
Module, ignition
ON.
- 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.
- Go to next step: If between 4.8 - 5.2 V
5. Verify the scan tool Brake Pedal Applied parameter is Inactive.
- Ignition OFF, disconnect the X2 harness connector at the K9 Body Control
Module, ignition
ON.
- Test for less than 1 V between signal circuit terminal 3 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.
- Go to next step: If Inactive
6. Install a 3 A fused jumper wire between the appropriate 5 V reference and
signal circuit terminal
3.
7. Verify the scan tool Brake Pedal Applied parameter is Active.
- Ignition OFF, disconnect the X2 harness connector at the K9 Body Control
Module.
- Test for infinite resistance between signal circuit terminal 3 and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in the signal circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K9 Body Control Module.
- Go to next step: If Active
8. Test or replace the B22 Brake Pedal Position Sensor.
DTC C0277 4B
1. Verify DTC C0277 4B is not set.
- Ignition ON
- Perform the brake pedal position sensor calibration procedure for the K9
Body Control Module. Refer to Brake Pedal Position Sensor Calibration.
- Verify the DTC does not reset while operating the vehicle under the
conditions for setting
the DTC.
- If the DTC resets, replace the B22 Brake Pedal Position Sensor.
- Go to next step: If the DTC does not reset
- All OK.
- Go to next step: If DTC C0277 4B is not set
2. All OK.
DTC C0277 09
1. Verify DTC C0277 09 is not set.
- Replace the B22 Brake Pedal Position Sensor.
- Perform the brake pedal position sensor calibration procedure for the K9
Body Control Module. Refer to Brake Pedal Position Sensor Calibration.
- 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.
- Go to next step: If the DTC does not reset
- All OK.
- Go to next step: If DTC C0277 09 is not set
2. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Brake Pedal Position Sensor Calibration
- Control Module References for BCM replacement, programming, and setup
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
NOTE: The following steps must be completed before using a symptom
table.
1. Perform the Diagnostic System Check - Vehicle before using a symptom table
in order to verify
that all of the following c
SEE MORE:
Inspection Procedure
1.
CONTROL MODULE DTC CHECK - Using a scan tool, perform the Vehicle DTC
Information function - Verify there are no current control module DTCs set. If
any DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle.
2. Check the alignment of the forward range radar mod
Special Tools
CH-42991 Strut Rod Nut Socket
CH-45400 Strut Spring Compressor
CH-48845-10 Strut Spring Compressor Bridge Adapter
Equivalent regional tools:Special Tools
Disassembly Procedure
1. Remove the front suspension strut assembly from the vehicle.
2.
WARNING: To prevent personal injury