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DTC U0101 Lost Communication with TCM: Description

The ECM (engine control unit) intercommunicates with the TCM (transmission control ECU) through the Controller Area Network (CAN)

If there is a problem in this intercommunication, the ECM sets a DTC

DTC DETECTION CONDITION CHART

DTC No. DTC Detection Condition Trouble Area
U0101 Following conditions are met for 1 25 seconds (1 trip detection logic)
  1. Engine switch on (IG)
  2. Battery voltage is 10 5 V or more
  3. No intercommunication between ECM and TCM
  • ECM
  • TCM
  • ECM to TCM circuit
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