Code p1639 5 volts reference circuit 2: p1639 reading 5 volts at 5 volt reference circuit. 2001 blazer. i am, and i have only checked Q&a: p1639 code
Sparkys Answers - 2008 GMC Yukon, Reduced Power Mode, Code P0641 00 Stored
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Codes p0651 and p0449: 5 volt reference #2 circuit short to ground...'bright idea' for short detection .
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