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Yeah error can not connect with pcm

The key light is on and the guages are jumpn around it cranks but wont start we replaced the pcm it didnt change any of the symptoms i could really use some ideas

I have a 04 grand cherokee thought was no fuel issue but noticed the key light on the fuel gauge is reading empty and the volt gauge is saying less than 9 volts i was told to replace pcm we ordered a new one pre programmed installed it and still have same issue