General Information

U0100 Lost Communication With ECM/PCM \'A\'

General Information

Component Location





General Description

The TCM can either receive data from the Engine Control Module or ABS control module, or it can send data to the ECM and ABSCM by using CAN communication. The CAN communication is one of the vehicle communications method, which is now widely used to transfer the vehicle data.

DTC Description

The TCM reads data on the CAN-BUS line and checks whether the data is equal to the data which the TCM sent before. If the data is not the same the TCM decides that either the CAN-BUS line or TCM are malfunctioning and sets this code.

DTC Detecting Condition





Diagnostic Circuit Diagram










Signal wave form & Data




Fig 1) Wave form of "CAN COMMUNICATION"