best to keep the posts in the thread so if people have this problem in the future it can be accessed.
"Hello this is Johnnie with the Envoy XUV model that you helped out. Got a question everything seemed fine but after not driving it for a couple of days I started it and all the gauges once again didn't register (exept for RPM and speed). Any thoughts? I disconnected the battery again hoping the ecm would reset but nothing changed. I was thinking maybe the alternator?"
the connection from the ipc to the pcm may be intermittent. i would take the battery cables off, take the cluster loose, inspect the gray wire there for looseness and anything funky in the connector, reseat it. then take the pcm c1 connector off and look at the dk green wire there looks like pin 58 or 59 depending which engine. then put the pcm plugs together and reconnect the battery and see what happens. if nothing i would measure the resistance on that wire from the pcm to the ipc. if thats good must be something in the pcm or ipc
1998 Bonneville SSE
2007 Monte Carlo LT-KYB, Clarion, Polk audio, Kicker
1999 Yukon SLE-KYB, Air lift, Reese dual-cam, Tekonsha
1987 Firebird-355/th400-nothing stock