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Originally Posted by dryeriii
Help!!
I purchased a 1998 Chevy Venture from a local auction and I am having a problem with the check engine light. I have purchased a scan tool and get the error code P1639 Control Module Analog to Digital Performance.
Anyone have any sugestions for me on this?
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Where did you get that description? I show DCT P1639 for GM vehicles to be "5 Volt Reference 2 Circuit".