LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2019 >> UX 250h Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Smart Access System W/ Push-Button Start (Start Function) (Diagnostic Codes & Symptom Tests (1 Of 2)) (Hybrid) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, HV Model) >> DTC B2779: Engine Starter Communication Malfunction [10/2018 - ] >> Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC B2779: Engine Starter Communication Malfunction [10/2018 - ]: Description

If the remote engine start ECU does not respond to the certification ECU (smart key ECU assembly) or the remote engine start ID is not registered, this DTC is stored.

HINT: 

Registration status of the remote engine start ECU ID can be checked using the "Wireless C Code" item in the Data List.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2779 Engine Starter Communication Malfunction One of the following conditions is met (1 trip detection logic*):
  • A remote start communication error occurs.
  • Response is not possible.
  • Registration has not been performed.
  • CAN communication system
  • Remote engine start ECU
  • Certification ECU (smart key ECU assembly)
 DTC output confirmation operation:
  1. A remote start operation is performed.
  1. *: Only output while a malfunction is present.
VEHICLE CONDITION AND FAIL-SAFE OPERATION WHEN MALFUNCTION DETECTED

Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Hybrid control system does not start with remote start operation Hybrid control system cannot be started by remote start operation only
RELATED DATA LIST AND ACTIVE TEST

DTC No. Data List and Active Test
B2779 Smart Access 
  • Wireless Starter Com ID
  • Wireless C Code
scientia non olet · About LEMON Manuals