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Home >> Chevrolet >> 2015 >> Spark EV >> Repair and Diagnosis >> Engine Performance >> Data Communication System - DTC B1000 To DTC U1839 >> Diagnostic Information and Procedures >> DTC U1839: Auxiliary Transmission Fluid Pump Control Module Lost Communication with Engine Control Module >> Circuit/System Verification

Circuit/System Verification

  1. Vehicle in Service Mode.
  2. Verify that DTC U0100 is not set.
    • If DTC U0100 is not set 
  3. Verify that DTC U0073, U0074, U0077, U0078, U007A, P06E4, P1EB9, U1814, U2099, B1325, B1330, B1370, B1380, B1424, B1428, B1440, B1441, B1517, C0800, C0899, C12E1, P0560 or P0562 is not set.
    • If none of the DTCs are set 
  4. Refer to Circuit/System Testing.