DTC U0100: Lost Communication with ECM / PCM "A": Description

The combination meter assembly and the ECM exchange signals through the CAN communication system.

DTC Code	DTC Detection Conditions	Trouble Areas
U0100	When either of following conditions detected: Vehicle speed 5 km/h (3.1 mph) or more and IG voltage 10.5 V or more No communication with ECM continues for 3 seconds or more (No communication to ECM and skid control ECU continues for 60 seconds or more)	CAN communication system ECM