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P0641 Diagnostic Trouble Code Discussion for September 2014

5-Volt Reference 1 Circuit Malfunction


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Trouble Ticket Help Requests for DTC P0641
Help Request Posted
2009 GMC Sierra 1500 SLE 5.3L No Start, MIL Lamp on VIN: 1GTEK29079
P0641: sensor ref volt A open. ... while the truck will crank but not start. If he turns the key off, and then tries again, it will start. Someone here has witnessed It one time. The Check engine light is on all the time. The P069E is obviously set because of problems elsewhere. I cleared t...
September 08, 2014