GM specific P1639 code?

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May 30, 2006 | 12:30 PM

nytoy

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GM specific P1639 code?

I says "P1639 5 Volt Reference #2 Circuit "

Can anyone tell me what this actually means?

May 30, 2006 | 01:13 PM

nytoy

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nevermind found it at http://www.gearchatter.com/viewtopic...ighlight=p1639
fuel tank and a/c sensors

May 30, 2006 | 04:15 PM

DrkPhx

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The TPS is also hooked to that circuit as well.

Jun 1, 2012 | 04:01 PM

luigiandme

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Sorry to bump this thread after 6 years. This is only for people looking to figure out this issue. Try checking your wiring harness behind the ECM. A smaller group of wires in black conduit will be coming out of the firewall on the passenger side. Remove the ECU to gain access. There's a self tapping screw that this harness may have rubbed through. Open the conduit and repair wires if necessary and secure harness away from screw!

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