Buick Regal: DTC C056E (Power Steering Control Module)

Diagnostic Instructions

• Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here:Diagnostic Procedure Instructions

DTC Descriptor

DTC C056E

Electronic Control Unit Software

Symptom Byte Information: Symptom Byte List.

Circuit/System Description

For an overview of the component/system, refer to:Power Steering System Description and Operation (Electronic Power Steering).

Conditions for Running the DTC

Ignition = On

Conditions for Setting the DTC

• K43 Power Steering Control Module = Missing Calibration
• Power Steering Control Module SPS Calibration Status = Incomplete
• VIN Not Programmed
• Software Malfunction

Actions Taken When the DTC Sets

Power Steering Output Torque = Default

Conditions for Clearing the DTC

• K43 Power Steering Control Module = Programmed
• K43 Power Steering Control Module = Calibrated

Reference Information

Schematic Reference

Power Steering Wiring Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEW INDEX

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References

Circuit/System Verification

Symptom Byte:43, 45, 46, 47, 4A, or 5A

1. Ignition - On / Vehicle - In Service Mode.

2. Verify DTC C056E is not set.

• If the DTC is set

1. Perform all necessary programming and setup procedures for the control module: K43 Power Steering Control Module
2. Verify the DTC does not set.
   • If the DTC sets - Replace the component: K43 Power Steering Control Module
   • Go to next step: If the DTC is not set
3. All OK.

• Go to next step: If the DTC is not set

3. All OK.

Symptom Byte:42

1. Ignition - On / Vehicle - In Service Mode.

2. Verify DTC C056E is not set.

• If the DTC is set

1. Calibrate the power steering control module.Refer to:Power Steering Control Module Calibration
2. Verify the DTC does not set.
   • If the DTC sets - Replace the component: K43 Power Steering Control Module
   • Go to next step: If the DTC is not set
3. All OK.

• Go to next step: If the DTC is not set

3. All OK.

Symptom Byte:37

1. Ignition - On / Vehicle - In Service Mode

2. Verify DTC C056E is not set.

• If the DTC is set

Replace the component: Steering Gear

• Go to next step: If the DTC is not set

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification

Electric Dual Pinion Rack and Pinion Steering Gear Replacement

For control module replacement, programming, and setup refer to: Control Module References.

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