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P0651 Diagnostic Trouble Code Discussion for May 2011

5-Volt Reference 2 Circuit Malfunction

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Trouble Ticket Help Requests for DTC P0651
Help Request Posted
2008 Chevrolet Impala LS 3.5L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: 2G1WB58N58
P0651: App 5 volt refence circuit. ... displays reduced power mode, no tach and barely runs on cold start. The only code I have is p0651 for the 5 volt ref. signal to the APP. When this acts up I have no tach signal to pcm, throttle position is fixed at 29%, and my app displays 0% no matter if ...
May 19, 2011