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U1900 Diagnostic Trouble Code Discussion for March 2018

CAN System Communication Error


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Trouble Ticket Help Requests for DTC U1900
Help Request Posted
2004 Mazda 6 i 2.3L MIL Lamp on VIN: 1YVHP85C64
U1900: CAN System Communication Error. vehicle drove in in, CEL on, TCS Light on, Battery Light on, no tachometer function, no speedometer function, Scanner reports PCM not present (Car runs)Charging circuit test good, Power and ground present at pcm, Main relay does not switch off with ignition of...
March 12, 2018
2004 Mazda 6 i 2.3L MIL Lamp on VIN: 1YVHP85C64
U1900: CAN System Communication Error. vehicle drove in in, CEL on, TCS Light on, Battery Light on, no tachometer function, no speedometer function, Scanner reports PCM not present (Car runs)Charging circuit test good, Power and ground present at pcm, Main relay does not switch off with ignition of...
March 15, 2018