DTC U1000: Lost Communication from ECM to TCM; DTC U0140: Lost Communication with Main Body ECU; DTC U0142: Lost Communication With Body Control Module "B"; DTC U0155: Lost Communication with Combination Meter; DTC U1117: Lost Communication with Accessory Gateway [08/2019 - ]: Description

These DTCs are stored when there is a CAN communication error between the certification ECU (smart key ECU assembly), ECM, 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
U0140	Lost Communication with Main Body ECU	CAN communication error between certification ECU (smart key ECU assembly) and ECM (1-trip detection logic*)	ECM	DTC Output Confirmation Operation: Turn the engine switch on (IG) and wait 10 seconds or more.
U0142	Lost Communication With Body Control Module "B"	CAN communication error 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: Always
U0155	Lost Communication with Combination Meter	CAN communication error 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: Always
U1000	Lost Communication from ECM to TCM	CAN communication error between certification ECU (smart key ECU assembly) and combination meter assembly (1-trip detection logic*)	Combination meter assembly	DTC Output Confirmation Operation: Turn the engine switch on (IG) and wait 10 seconds or more.
U1117	Lost Communication with Accessory Gateway	Data from the option connector (bus buffer ECU) cannot be received.	Connector and branch wire of sub bus 2 of option connector (bus buffer ECU) Internal malfunction of option connector (bus buffer ECU)	DTC Output Confirmation Operation: Turn the engine switch on (IG) and wait 10 seconds or more.

*: 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.	If the following conditions are met, it can be determined that the malfunction is not in the direct line (NE) but in CAN communication. When the engine switch is pressed, the system controls the engine based on the engine speed signal via direct line, causing the engine to stop cranking. When the engine switch is pressed and held, the system controls the engine based on the engine speed signal via direct line, causing the engine to stop cranking. If the following conditions are met, it can be determined that there is a malfunction in both CAN communication and the direct line (NE). When the engine switch is pressed, the engine stops cranking after 6 seconds. When the engine switch is pressed and held, the engine remains cranking for up to 30 seconds.
U0140 U0142	Doors cannot be locked or unlocked. The warning (wireless buzzer) does not sound.	-
U0155	The warning (meter buzzer) does not sound and the meter does not indicate a warning.	-
U1117	The engine cannot be started using the wireless remote control function.	-

RELATED DATA LIST AND ACTIVE TEST ITEMS

DTC No.	Data List and Active Test
U0100 U0140 U0142 U0155 U1117	-