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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Data Communication System - DTC B1000 To DTC U1818 >> Diagnostic Information and Procedures >> DTC U1340-U135F: Control Module U Code List >> Circuit/System Verification

Circuit/System Verification

  1. Determine the LIN device that is not communicating. Refer to Control Module U Code List .
  2. Ignition ON/Vehicle In Service Mode.
  3. Verify that DTC B1325, B1330, B1370, B1380, B1424, B1440, B1441, B1517, C0800, C0899, C12E1, P0560, P0562, U0028, U0029, U0100-U02FF or U2098 is not set.
    • If none of the DTCs are set 
  4. Refer to Circuit/System Testing.
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