Power Steering

DTC C056D

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) provide an overview of each diagnostic category.

DTC Descriptor
DTC C056D 39
- ECU Hardware Performance Internal Electronic Failure

Circuit/System Description

The power steering control module (PSCM) continuously monitors the internal circuitry within the module.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

This DTC will set if the PSCM detects an internal malfunction within the module.

Actions Taken When DTC Sets

* DTC C056D is stored in memory.
* The driver information center (DIC) displays the SERVICE POWER STEERING warning message.
* No steering assist.

Conditions for Clearing the DTC

* A current DTC will clear on the next malfunction free ignition cycle.
* A history DTC will clear after 100 consecutive malfunction-free ignition cycles, without the repeat of the internal malfunction.

Reference Information
Schematic Reference

Power Steering Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Power Steering System Description and Operation (Turbo) (Description and Operation)Power Steering System Description and Operation (Non-Turbo) (Description and Operation)
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

Programming and Relearning (Programming and Relearning) for scan tool information

Circuit/System Verification

Verify DTC C056D 39 is not set.

If the DTC is set, clear the DTC, and operate the vehicle within the conditions for setting the DTC. Verify the DTC does not reset. If the DTC resets, replace the PSCM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Programming and Relearning (Programming and Relearning) for PSCM replacement, setup, and programming