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DTC U0100 Lost Communication with ECM/PCM "A": Description

WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

The engine control unit and the transmission control unit are located inside the ECM. The engine control unit intercommunicates with the transmission control ECU with the Controller Area Network (CAN). If there is a problem in this intercommunication, the ECM sets a DTC.

DTC TROUBLE DETECTION CONDITION

DTC No. DTC Detection Condition Trouble Area
U0100 Following conditions are met for 2 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 ECU and transmission control ECU
 ECM
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