Power Steering

DTC C056E (with HP5)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (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) provide an overview of each diagnostic category.

DTC Descriptor
DTC C056E 4B
- ECU Software Performance Calibration Not Learned

DTC C056E 42
- ECU Software Performance Calibration Data Set Not Programmed

DTC C056E 45
- ECU Software Performance Variant Not Programmed

DTC C056E 46
- ECU Software Performance Configuration Not Programmed

Circuit/System Description

DTC C056E 4B

After either replacing the power steering control module or steering gear assembly, the PSCM Centering Procedure must be performed.

DTC C056E 42

After replacement of the power steering control module, the PSCM must be configured with the proper calibration file using the service programming system (SPS).

DTC C056E 45

After replacement of the power steering control module or steering gear assembly, the PSCM must learn the mechanical center of the steering gear.

DTC C056E 46

After a battery disconnection or loss of battery, the power steering control module PSCM must undergo initialization.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

DTC C056E 4B

This DTC will set if the PSCM has not been calibrated using the PSCM Centering Procedure PSCM Centering Procedure.

DTC C056E 42

This DTC will set if the PSCM has not undergone SPS reprogramming.

DTC C056E 45

This DTC will set if the PSCM has not learned the mechanical center of the steering gear by turning the steering wheel 90 degrees to the left, and then 90 degrees past center to the right.

DTC C056E 46

This DTC will set if the PSCM has not undergone initialization by turning the steering wheel left and right lock-to-lock.

Actions Taken When DTC Sets

* The driver information center (DIC) displays the SERVICE POWER STEERING warning message.
* Steering assist is set to a default level.

Conditions for Clearing the DTC

DTC C056E 4B

DTC will clear after the PSCM has been calibrated using the PSCM Centering Procedure.

DTC C056E 42

DTC will clear after the PSCM has been configured with the proper calibration file.

DTC C056E 45

DTC will clear after the PSCM has learned the mechanical center of the steering gear.

DTC C056E 46

DTC will clear after the PSCM has undergone initialization.

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 (without HP5) (Description and Operation)Power Steering System Description and Operation (with HP5) (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 Verification

B056E 4B

Verify DTC C056E 4B is not set.

If the DTC is set, perform the PSCM Centering Procedure. If DTC resets, replace the PSCM.

B056E 42

Verify DTC C056E 42 is not set.

If the DTC is set, reprogram the PSCM. If the DTC resets, replace the PSCM.

B056E 45

Verify DTC C056E 45 is not set.

If the DTC is set, perform the PSCM Centering Procedure. If DTC resets, replace the PSCM.

B056E 46

Verify DTC C056E 46 is not set.

If the DTC is set, turn the steering wheel all the way to the left, then all the way to the right, then return the wheel to center position. If the DTC resets, replace the PSCM.

Repair Instructions

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

* Control Module References (Programming and Relearning) for PSCM replacement, setup, and programming
* Steering Gear Replacement (HP5) (Service and Repair)Steering Gear Replacement (NJ1 or HP7) (Service and Repair)Steering Gear Replacement (NVH) (Service and Repair)