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Home >> Cadillac >> 2016 >> ELR >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System - DTC B1000 To DTC U183B >> Diagnostic Information and Procedures >> DTC C056D: Electronic Control Unit Hardware >> Circuit/System Verification
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Circuit/System Verification

  1. Vehicle in Service Mode.
  2. Verify DTC C056D is not set.
    • If DTC C056D is set in a device that can be programmed 
    1. Program the device that set the DTC.
    2. Verify the DTC does not set.
      • If the DTC sets, replace the device that set the DTC.
      • If the DTC does not set
    3. All OK.
    • If DTC C056D is set in a device that cannot be programmed 

      Replace the device that set the DTC.

    • If DTC C056D is not set 
  3. All OK
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