The most common is a bad cluster
you have to remove it
that could be a pain but it can be done
after removing the cluster remove the cardboard cover in the back remove
circuit panel board and check in the middle for a broken weld here your question for your insterment panel
The Transmission Control Module (TCM) is not communicaring with the PCM.
Check all fuses. It could be a power or ground problem or a ccd bus communication wiring problem.
If not it's likely an internal failure in the TCM.
You may be able to get a schamatic at your local library.
If it's not a power, ground or wiring issue you should take it to a dealer with a DRB III to confirm the diagnosis.
Best of Luck!
Source(s):
Master Technician
Shop Foreman at a Dodge Chrysler jeep Dealer
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