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2006 grand cherokee.. service four wheel drive system

the light on my dash just came on, what does this mean?

Fault detected and you need to get the codes scanned at a mechanic who can read/interpret likely specific Jeep computer codes.

The warning message indicates a fault is detected in the Final Drive Control Module (transfer case control module). However there is a software update to address “erroneous fault warning”.

Remember when the transfer-case control module was the drivers right hand?? What was wrong with THAT system?? It NEVER failed…