I don't know if pre '03s do this, or not, but if you have a check engine light on, you can turn the key on and off three times and the error code will display right on the digital odometer. Pretty cool...
I had a check engine light come on in my truck. The code was for insufficent slip in the torque converter.

I called Clint @ ATS about it, and he said this is a normal error/code with the CA Dodge trucks running the triple lok TC. He said the only work around is to set the trans commander to allow a higher slip.