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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (4 Of 4) >> DTC U0101 Lost Communication with TCM >> Description
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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 engine control ECM and TCM
  • ECM
  • TCM
  • ECM to TCM circuit