DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0126-87: Lost Communication with Steering Angle Sensor Module Missing Message; DTC U0129-87: Lost Communication with Brake System Control Module Missing Message; DTC U0131-87: Lost Communication with Power Steering Control Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0151-87: Lost Communication with Restraints Control Module Missing Message; DTC U0164-87: Lost Communication with HVAC Control Module Missing Message; DTC U1110-87: Lost Communication with Intuitive Parking Assist Module Missing Message [12/2019 - 10/2022]: Description

The engine stop and start ECU communicates with the SFI system, electronically controlled brake system, power steering system, air conditioning system, airbag system and main body ECU (multiplex network body ECU) via CAN communication.

If there is a communication error between the engine stop and start ECU and any of the systems, the engine stop and start ECU stores DTCs and illuminates the stop and start cancel indicator except when there is a communication error with the meter / gauge system.

HINT: 

• When there is an open in the output side of the backup boost converter (built into the engine stop and start ECU), power to the system with the open is cut off. The engine stop and start ECU stores CAN communication DTCs for the system with the open and stop and start system DTC P323A-16.
• When the backup boost converter (built into the engine stop and start ECU) detects overcurrent in any of the circuits it supplies power to, it shuts off the circuit. The engine stop and start ECU stores CAN communication DTCs for the system which circuit was shut off and stores stop and start system DTC P323A-19.

  e.g.: When the backup boost converter (built into the engine stop and start ECU) detects overcurrent in the power source circuit of the power steering system and cuts off power supply, the engine stop and start ECU stores DTCs U0131-87 and P323A-19.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Memory	Note
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	No communication between the engine stop and start ECU and ECM for 1 second.	Wire harness or connector Engine stop and start ECU ECM	Blinks	DTC stored	SAE Code: U0100
U0126-87	Lost Communication with Steering Angle Sensor Module Missing Message	No communication between the engine stop and start ECU and steering sensor for 1 second.	Wire harness or connector Engine stop and start ECU Steering sensor	Blinks	DTC stored	SAE Code: U0126
U0129-87	Lost Communication with Brake System Control Module Missing Message	No communication between the engine stop and start ECU and skid control ECU (brake actuator assembly) for 2.22 seconds.	Wire harness or connector Engine stop and start ECU Skid control ECU (Brake actuator assembly)	Blinks	DTC stored	SAE Code: U0129
U0131-87	Lost Communication with Power Steering Control Module Missing Message	No communication between the engine stop and start ECU and the power steering ECU (rack and pinion power steering gear assembly) for 1 second.	Wire harness or connector Engine stop and start ECU Power steering ECU (Rack and pinion power steering gear assembly)	Blinks	DTC stored	SAE Code: U0131
U0140-87	Lost Communication with Body Control Module Missing Message	No communication between the engine stop and start ECU and the main body ECU (multiplex network body ECU) for 3.6 seconds.	Wire harness or connector Engine stop and start ECU Main body ECU (multiplex network body ECU)	Blinks	DTC stored	SAE Code: U0140
U0151-87	Lost Communication with Restraints Control Module Missing Message	No communication between the engine stop and start ECU and airbag sensor assembly for 10.6 seconds.	Wire harness or connector Engine stop and start ECU Airbag sensor assembly	Blinks	DTC stored	SAE Code: U0151
U0164-87	Lost Communication with HVAC Control Module Missing Message	No communication between the engine stop and start ECU and air conditioning amplifier assembly for 10.6 seconds.	Wire harness or connector Engine stop and start ECU Air conditioning amplifier assembly	Blinks	DTC stored	SAE Code: U0164
U1110-87	Lost Communication with Intuitive Parking Assist Module Missing Message	No communication between the engine stop and start ECU and the clearance warning ECU assembly for 1 second.	Wire harness or connector Engine stop and start ECU Clearance warning ECU assembly	Blinks	DTC stored	SAE Code: U1110