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P0641 Diagnostic Trouble Code Discussion for August 2014

5-Volt Reference 1 Circuit Malfunction

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Trouble Ticket Help Requests for DTC P0641
Help Request Posted
2004 GMC Envoy SLT 4.2L Hesitation VIN: 1GKET12S84
P0641: 5-Volt Reference 1 Circuit Malfunction. This vehicle was brought in and when stepping on gas reduced power light comes on and vehicle seems to be in almost a limp mode. Can not get over 30 miles per hour. It has very little power. I have been checking posts and was wondering if it needs updated prog...
August 03, 2014