2002 quad cab 1500 with a 4.7 ,auto 3 speed with o/d believe its the a500. I googled the code and it said tcm to pcm problem with the bus.Check engine light came on with that code.After it cycled a few times after cooling and driving a 100 miles or so the check engine light went out.Possibly related is the oil pressure gauge jumps to the middle of the gauge when you start the motor but never moves up or down with rpm changes. The temp gauge never goes to hot even though my radiator started leaking and i caught it low on water and know it was hot.Never had a warning from the gauge . Not positive but seems there operation is snafu. The only modification ever done is a k&n air filter and a remote start and door locks control.I have owned the truck since new.Wife and daughter always drove it till last month so it has been babied.