PCI Bus System - Electrical Issues (Gauge Cluster Issues) - JeepForum.com
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Unread 03-16-2011, 04:43 PM   #1
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2000 WJ 
Join Date: Mar 2011
Location: Marietta, Georgia
Posts: 2
Exclamation PCI Bus System - Electrical Issues (Gauge Cluster Issues)

2000 Jeep Grand Cherokee V6.

New battery installed and within a week the gauge cluster is going haywire. Sentry key light, check engine light, check gauges light all stay on while tach and speedometer go up and die continuously, the gas light comes on and off while the dial goes up and down. At first it was intermittent and after about 20-30 minutes of driving it stopped. Until most recently, the outside temperature reading will come on late, automatic doors lock late, window module on driver's side clicks. Not to mention while sitting in it in the driveway checking things out, the driver's side mirror decided to move on it's own. Now, it continuously stalls about 2 minutes after starting it up.. just for it to start up again completely fine. Everything else works fine, AC, radio, exterior and interior lighting. Recently unhooked the battery for about 10 minutes and car started up perfectly and the cluster worked great. Then it stalled again halfway down the road and the cluster lost it.

Idiots at the dealership replaced the Idle Control Valve and cleaned the throttle body. They wanted to replace the Window Module and get a new cluster.. only to fix the cosmetics of course and not the real issue.

I spoke with a Jeep specialist out here in Roswell, GA who immediately told me it was a malfunction in the PCI Bus System. He'd have to do a trial and error fix on it by doing a process of elimination by replacing different things here and there within the Bus System.

I know a bunch of people have posted with similar issues and the topic of the PCI is brought up quite a bit but I'm just trying to find someone who's actually had that checked out and if it's truly fixed the problem? Also, is it a guaranteed fix or will it return say the PCI system is 100%?

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Unread 03-16-2011, 05:06 PM   #2
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2002 WJ 
Join Date: Feb 2010
Location: Wyoming, Michigan, Michigan
Posts: 1,078
I would say check your wiring on the passenger side under the dash. Follow the A-pillar down and remove the panel covering the lower right section where your feet would go. I believe that piece goes along the door opening on the bottom too. I've seen wiring problems there and wires corroding. Just a thought.
2002 WJ 4.0 3" IRO, ES9000 shocks. Midland CB. 245/75R16 Dunlop M/T.
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