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P0642 Diagnostic Trouble Code Discussion for June 2011

Sensor Reference Voltage 1 Circuit Low

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Trouble Ticket Help Requests for DTC P0642
Help Request Posted
2005 Chevrolet Silverado 3500 6.6L No Start, Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 1GCHK33285
P0642: 5-Volt Reference 1 Circuit Low Voltage. ... last year and prob went away for almost a year! Last time code p0642 would store after long runs when towing and very hot (great time for a failure) vehicle would store code and immediately stall. Sometimes would restart, sometimes not. Had to 4 different ...
June 21, 2011