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P0643 Diagnostic Trouble Code Discussion for February 2015

Sensor Power Supply Circuit Malfunction


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Trouble Ticket Help Requests for DTC P0643
Help Request Posted
2007 Lincoln Town Car Signature Limited 4.6L Poor Idle Quality, MIL Lamp on VIN: 1LNHM82V17
P0643: Sensor reference voltage A high. Vehicle was towed in for a start and stall to a cranks but will not start.Horn was stuck on and check engine light was illuminated.Found failure in wiring harness from Battery junction box on passenger side of vehicle to core support and eventually to drivers ...
February 07, 2015