DTC U0101: Lost Communication with TCM [11/2016 - ]: Description

WARNING: This page is about a different car, the 2019 Toyota Highlander, 2018 Toyota Highlander, and 2017 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.

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

If there is a problem in this communication, the ECM stores a DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
U0101	Lost Communication with TCM	Following conditions are met for 1.25 seconds (1 trip detection logic): (a) Ignition switch ON (b) Battery voltage is 10.5 V or higher (c) No communication between ECM and TCM	ECM	Comes on	DTC stored