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Home >> Buick >> 2020 >> Regal Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 109 (Power Steering System) >> Diagnostic Information and Procedures >> DTC C056E (Power Steering Control Module) >> Circuit/System Verification
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Circuit/System Verification

WARNING: This page is about a different car, the 2018 Buick Regal TourX and 2018 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

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.
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