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Home >> GMC >> 2013 >> Sierra 1500 XFE >> Repair and Diagnosis >> External Pages >> Different car >> Section 2558 (Data Communication System) >> Diagnostic Information and Procedures >> DTC U0077: Control Module Communication Chassis Expansion CAN Bus >> Circuit/System Verification
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Circuit/System Verification

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  1. Ignition ON.
  2. Verify DTC U0077 is not set.
    • If DTC U0077 is not set 
  3. All OK
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