Service Information

Volt

DTC C047A

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 Descriptor

DTC C047A: Electric Steering Motor Position Sensor Circuit Malfunction

The power steering control module continuously monitors the motor position sensor voltage signals. The voltage signals of the motor position sensor and the digital torque sensor index current signal are both processed by the power steering control module to detect and calculate the steering wheel angle.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The power steering control module detects a short to ground, short to voltage, or an open/high resistance on any of the internal motor position sensor circuits.

Action Taken When the DTC Sets

•	No steering assist.

•	The driver information centre displays the SERVICE POWER STEERING warning message.

Conditions for Clearing the DTC

•	A current DTC will clear on the next malfunction-free ignition cycle.

•	A history DTC will clear after 40 consecutive malfunction-free ignition cycles.

Reference Information

Schematic Reference

Power Steering Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Steering System Description and Operation : Electronic Power Steering

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 Verification

With a scan tool verify that DTC C047A is not set.

⇒	If the DTC is set

Refer to Circuit/System Testing below.

⇓	If the DTC is not set

All OK.

Circuit/System Testing

With a scan tool perform the Power Steering Control Module Calibration procedure Steering Angle Sensor Centring and Software Endstop Learning.
Verify that DTC C047A does not set.

⇒	If the DTC does set

Replace the K43 Power Steering Control Module.

⇓	If the DTC does not set

All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing repair procedures.

•	Steering Gear Replacement

•	Control Module References for power steering control module replacement, programming and setup