Originally Posted by Help from a Dodge Buddy

No buss in odo,no fuel gauge ,no volt gauge operation? This is the best advice use the book or any new information about it.The book may tell you to change a part that it doesnt need and or it didn't fix the problem So move on.So many things can cause the network to go down, Think of the Buss as a two wire phone line that all the modules can share information on and can cause no comms between modules. wireing,conectors, wrong part, new parts and so on I have seen many failure's Pcm's,Clusters,body controle modules,radios even A/c heater control heads on the caravans,and etc.etc. I had a shorted Cam sensor causing a Durango with a 4.7 to not start but crank, the pcm and cluster were not talking on the buss due to a cam sensor short internally found by thinking why is the 5 volt referance from the new PCM the book said to change not there. A good scaner,test light a volt meter and some asprin help fix this one.WHAT i'm trying to say here is if the book say's to change a part it may be wrong.So Just be glad it's not your car or your money that you are spending unless you are working on your own car then check the sensors Cam,Crank,O2 etc. first before changeing the PCM I Hope this Helps save someone money.

Originally Posted by JCswm

Durango only
This one Kicked my *** the first time I got one




The crankshaft sensor shorts out internally and grounds the 5V wire the modiules use to "talk" to each other.
That's all, If you have a scan tool you think lightning hit your car 'cause you can't get any info from any module
climb under the passenger side of your truck with a new crank sensor and a 10mm ..... anything, one easy bolt holds it in!