DTC U0100: Lost Communication with ECM / PCM "A" (TO 08/2009): Description

The engine control unit communicates with the TCM using the Controller Area Network (CAN).

If there is a problem in this communication, the TCM sets a DTC.

DTC No.	DTC Detection Condition	Trouble Area
U0100	Following conditions are met for 1.25 seconds (1 trip detection logic): Engine switch on (IG) Battery voltage is 10.5 V or more No communication between the engine control ECU and TCM	Harness and connector ECM TCM