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Home >> Lexus >> 2020 >> ES 300h Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 123 (Engine Control System (2GR-FKS) - Diagnostic Codes (10 Of 10) & Circuit Tests (1 Of 2)) >> SFI System >> DTC U0101-87: Lost Communication with TCM Missing Message [06/2018 - 08/2021] >> Monitor Description

Monitor Description

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The engine control unit and the transmission control unit are located inside the ECM. The engine control unit intercommunicates with the transmission control via CAN communication.

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

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
U0101-87 Lost Communication with TCM Missing Message All of the following conditions are met for 1.25 seconds (1 trip detection logic):
  • Engine switch on (IG)
  • Battery voltage is 10 V or higher
  • No communication between engine control unit and transmission control unit
 ECM Comes on DTC stored SAE Code: U0101
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