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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 178 (Smart Access System (For Start) (Hybrid) - Diagnostic Codes) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, HV Model) >> DTC U0100: Lost Communication with ECM / PCM; DTC U0140: Lost Communication with Main Body ECU; DTC U0142: Lost Communication with Main Body ECU; DTC U0155: Lost Communication with Combination Meter; DTC U0293: Lost Communication with Hybrid Vehicle Control System [06/2018 - ] >> Description

DTC U0100: Lost Communication with ECM / PCM; DTC U0140: Lost Communication with Main Body ECU; DTC U0142: Lost Communication with Main Body ECU; DTC U0155: Lost Communication with Combination Meter; DTC U0293: Lost Communication with Hybrid Vehicle Control System [06/2018 - ]: Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

These DTCs are stored when there is a CAN communication malfunction between the ECM, certification ECU (smart key ECU assembly), hybrid vehicle control ECU, main body ECU (multiplex network body ECU) or combination meter assembly, and data from the option connector (bus buffer ECU) cannot be received.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
U0100 Lost Communication with ECM / PCM CAN communication error between certification ECU (smart key ECU assembly) and ECM (1-trip detection logic*) ECM DTC Output Confirmation Operation: 
  1. Turn the power switch on (IG) and wait at least 10 seconds.
U0140 Lost Communication with Main Body ECU CAN communication malfunction between certification ECU (smart key ECU assembly) and main body ECU (multiplex network body ECU) (1-trip detection logic*) Main body ECU (multiplex network body ECU) DTC Output Confirmation Operation: 
  1. Always
U0142 Lost Communication with Main Body ECU CAN communication malfunction between certification ECU (smart key ECU assembly) and main body ECU (multiplex network body ECU) (1-trip detection logic*) Main body ECU (multiplex network body ECU) DTC Output Confirmation Operation: 
  1. Always
U0155 Lost Communication with Combination Meter CAN communication malfunction between certification ECU (smart key ECU assembly) and combination meter assembly (1-trip detection logic*) Combination meter assembly DTC Output Confirmation Operation: 
  1. Turn the power switch on (IG) and wait at least 10 seconds.
U0293 Lost Communication with Hybrid Vehicle Control System CAN communication error between certification ECU (smart key ECU assembly) and hybrid vehicle control ECU (1-trip detection logic*) Hybrid vehicle control ECU DTC Output Confirmation Operation: 
  1. Turn the power switch on (IG) and wait at least 10 seconds.
  1. *: Only detected while a malfunction is present.
VEHICLE CONDITION AND FAIL-SAFE FUNCTION WHEN MALFUNCTION DETECTED

DTC Code Vehicle Condition when Malfunction Detected Fail-safe Function when Malfunction Detected
U0100 There is no effect on vehicle behavior. -
U0140
U0142
  • Doors cannot be locked or unlocked.
  • The warning (wireless buzzer) does not sound.
 -
U0155 The warning (meter buzzer) does not sound and no warning messages displayed on the multi-information display. -
U0293 The warning (meter buzzer) does not sound and no warning messages displayed on the multi-information display. -
RELATED DATA LIST AND ACTIVE TEST ITEMS

DTC No. Data List and Active Test
U0100
U0140
U0142
U0155
U0293		 -
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