GM specific P1639 code?
05-30-2006, 01:13 PM
#2
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nevermind found it at http://www.gearchatter.com/viewtopic...ighlight=p1639
fuel tank and a/c sensors
fuel tank and a/c sensors
06-01-2012, 04:01 PM
#4
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!
