Chevrolet Trax: DTC C056D: Electronic control unit hardware

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 provide an overview of each diagnostic category.

DTC Descriptors

DTC C056D 39

Electronic Control Unit Hardware Internal Malfunction

DTC C056D 3B

Electronic Control Unit Hardware Internal Self - Test Malfunction

DTC C056D 3C

Electronic Control Unit Hardware Internal Communication Malfunction

Circuit/System Description

The power steering control module continuously monitors the voltage and current levels being commanded to the 3-phase steering assist motor. The power steering control module compares the desired and actual current levels to detect malfunctions in the internal power steering assist motor circuits

Conditions for Running the DTC

Ignition OFF, ACCESSORY, or RUN mode.

Conditions for Setting the DTC

The power steering control module has detected missing calibration data, calibration procedure not run or completed, missing VIN, or internal software malfunction

Actions Taken When DTC Sets

• DTC is stored in memory
• Steering assist is set to a default level.

Conditions for Clearing the DTC

A current or history DTC will clear after the power steering control module has been programmed and calibrated.

Reference Information

Schematic Reference

Power Steering Schematics (Encore), Power Steering Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Power Steering System Description and Operation

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

1. Ignition ON.
2. Verify that DTC C056D is not set.

• If DTC C056D is set

1. Program the K43 Power Steering Control Module.
2. Verify the DTC does not set.

• If the DTC sets, replace the Steering Column.
• If the DTC does not set

3. All OK.

• If DTC C056D is not set

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Steering Column Replacement (Mexico, N40) , Steering Column Replacement (Canada, NJ1) , Steering Column Replacement (United States, NJ1)
• Control Module References for power steering control module replacement, programming and setup.

SYMPTOMS - POWER STEERING SYSTEM

NOTE: Review the system description and operation in order to familiarize yourself with the system functions. Refer to Power Steering System Description and Operation.

Visual/Physical Inspection

• Inspect for aftermarket devices which could affect the operation of the power steering system.
• Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
• If equipped with hydraulic power steering, inspect for leaking power steering components. If necessary, refer to Power Steering Fluid Leaks.
• If equipped with hydraulic power steering, verify the power steering fluid level is correct. Refer to Checking and Adding Power Steering Fluid.
• If equipped with hydraulic power steering, inspect the power steering fluid for the following indications of contamination:

• Milky fluid - water
• Brown fluid - burnt
• Debris in fluid - plastic or dirt

• If the hydraulic power steering system is contaminated, flush the power steering system. Refer to Power Steering System Flushing.

Symptoms List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

• Power Steering Fluid Leaks
• Rattle, Clunk, or Shudder Noise from the Power Steering System (NJ1), Rattle, Clunk, or Shudder
• Noise from the Power Steering System (2H0, N40), Rattle, Clunk, or Shudder Noise from the Power Steering System (LUJ, N40)
• Whine or Growl Noise from the Power Steering System (N40), Whine or Growl Noise from the Power Steering System (NJ1)
• Increase in Effort While Turning Steering Wheel
• Poor Return of Steering Wheel
• Steering Effort Hard or Too Easy in One or Both Directions (N40), Steering Effort Hard or Too Easy in One or Both Directions (NJ1)

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