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2006 Dodge Durango - Won't communicate

Entire dashboard lit up like a xmas tree, going on and off every 3 or so seconds. Everything going haywire, all of my gauges needles jumping up and down The car lot I bought it from says the computer isn’t communicating. What does that mean?

Get your battery checked first, low voltage or corroded terminals can mess up computer functions. If the battery checks out okay, have the computer codes read and post the codes here.
All of this (usually) be done free of charge at an auto parts store such as Autozone.
As far as what does this mean? The car’s computer controls many functions in your car, dash lights usually are warning the driver of something.