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Home >> GMC >> 2016 >> Yukon Denali, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC C056D: Electronic Control Unit Hardware >> Circuit/System Verification
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Circuit/System Verification

  1. Ignition ON.
  2. Verify DTC C056D is not set.
    • If DTC C056D is set 

      Replace the device that set the DTC.

    • If DTC C056D is not set 
  3. All OK
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