Question about GMC Cars & Trucks
What does the fault code on my instument cluster mean when it reads service 4wd
That means the 4wd switch on your dash is faulty and needs to be replaced.
Posted on Nov 01, 2012
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Posted on Jan 02, 2017
In most vehicles there is a wiring harness that runs under your dash to your heater etc. Sometimes the main plug comes loose. If you open up the steering column or somewhere down by your feet on the steering column is the main plug - look in your manual and track the wires with a tester ensuring you have power all the way to whatever is not working. If there is no power at the main plug then you might have a ground problem or a loose wire in the plug itself. Good luck
Posted on Jun 26, 2009
I have this problem too and my new Saab mechanic told me that I would probably need a new instrument cluster. He said a brand new one costs $2500 but that he would order me a used one from a car that had fewer miles than mine as you can set them back but not forward. He both diagnosed and temporarily "fixed" the problem by slamming his hand really hard on the dash over the panel and all the lights and gauges immediately started working fine....for now. I haven't had the work done yet (I have a 1998 Saab 900S with 130K) so if anyone has any other ideas about this I would love to know what they are. This issue with the gauges and dash lights has been happening on and off for over a YEAR and this is the first time someone has had any idea what it is. I already had my ignition switched replaced so we know that's not what it was. THANKS
Posted on Oct 07, 2009
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