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Home >> Toyota >> 2011 >> Highlander Hybrid Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 42 (Engine Control System (1AR-FE) (Diagnostic Codes (P1604 - U0101) & Circuit Tests)) >> SFI System >> DTC U0101: Lost Communication with TCM >> Description

DTC U0101: Lost Communication with TCM: Description

WARNING: This page is about a different variant/trim than selected.

The Engine Control Module (ECM) intercommunicates with the Transmission Control Module (TCM) through the Controller Area Network (CAN).

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

DTC No. DTC Detection Condition Trouble Area
U0101
  • Following conditions are met for 1.25 seconds (1 trip detection logic):
    1. Ignition switch ON
    2. Battery voltage 10.5 V or more
    3. No intercommunication between ECM and TCM
  • ECM to TCM circuit
  • TCM
  • ECM