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Home >> Cadillac >> 2016 >> ELR >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Data Communication System - DTC B1000 To DTC U183B >> Diagnostic Information and Procedures >> DTC U0400 - U05FF: Control Module >> Circuit/System Verification
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Circuit/System Verification

  1. Engine running for 10 seconds.
  2. Vehicle in Service Mode.
  3. Verify DTC U0400-U05FF is not set.
    • If DTC U0400-U05FF is set without other DTCs set 
    1. Program the device specified by the DTC descriptor.
    2. Verify the DTC does not set.
      • If the DTC sets, replace the appropriate device.
      • If the DTC does not set
    3. All OK.
    • If DTC U0400-U05FF is not set 
  4. All OK
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