C0455
DTC C0455
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (with HP2) (Initial Inspection and Diagnostic Overview)Diagnostic System Check - Vehicle (without HP2) (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptors
DTC C0455 09
- Front Steering Position Sensor Circuit Rate of Change Above Threshold
DTC C0455 19
- Front Steering Position Sensor Circuit Signal Amplitude Greater Than Maximum
DTC C0455 39
- Front Steering Position Sensor Circuit Internal Electronic Failure
DTC C0455 5A
- Front Steering Position Sensor Circuit Plausibility Failure
Diagnostic Fault Information
Circuit/System Description
The electronic brake control module (EBCM) monitors the Phase A , Phase B, Index and Analog signal circuits from steering angle sensor. The analog signal is used along with the index pulse to calibrate the steering angle sensor (SAS). The SAS position is then determined by Phase A and Phase B signals. The 2 input signals Phase A and Phase B are approximately 90 degrees out of phase. Once calibrated, the EBCM dynamically interprets the relationship between the Phase A and Phase B inputs, and determines the position of the steering wheel and the direction of the steering wheel rotation.
Conditions for Running the DTC
* Ignition ON.
* Ignition voltage is greater than 10 volts.
Conditions for Setting the DTC
C0455 09 or C0455 19
The EBCM detects an internal sensor failure.
C0455 39 or C0455 5A
The EBCM detects a short to voltage, short to ground or an open/high resistance on one of the steering angle sensor circuits.
Action Taken When the DTC Sets
* The EBCM disables the vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
* A DIC message and/or a warning indicator may be displayed.
Conditions for Clearing the DTC
* The condition for the DTC is no longer present.
* The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.
Reference Information
Schematic Reference
Antilock Brake System Schematics ()
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
ABS Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the steering angle sensor.
2. Ignition OFF, test for less than 5.0 ohm between the low reference circuit terminal 2 and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 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 EBCM.
• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
4. Verify the scan tool Steering Wheel Sensor Signal parameter is less than 1 volt.
• If greater than the specified range, test the signal circuit terminal 6 for a short to voltage. If the circuit tests normal, replace the EBCM.
5. Install a 3A fused jumper wire between the signal circuit terminal 6 and the 5-volt reference circuit terminal 1. Verify the scan tool Steering Wheel Sensor Signal parameter is greater than 4.5 volts.
• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
6. Verify the scan tool Digital SWPS Phase A parameter is High.
• If not the specified parameter, test the signal circuit terminal 7 for a short to ground. If the circuit tests normal, replace the EBCM.
7. Install a 3A fused jumper wire between the signal circuit terminal 3 and the low reference circuit terminal 2. Verify the scan tool Digital SWPS Phase A parameter is Low.
• If not the specified parameter, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the EBCM.
8. Verify the scan tool Digital SWPS Phase B parameter is High.
• If not the specified parameter, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the EBCM.
9. Install a 3A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 2. Verify the scan tool Digital SWPS Phase B parameter is Low.
• If not the specified parameter, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the EBCM.
10. Ignition ON, test for B+ between the signal circuit terminal 5 and ground.
• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
11. If the circuits test normal, replace the steering angle sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Steering Wheel Position Sensor Replacement (Steering Wheel Position Sensor Replacement)
* Control Module References (Programming and Relearning) for EBCM replacement, setup, and programming