My car won't start. The word deck shows up and then a number 83989 shows up on 2000 Chrysler Sebring

It has been giving me problems starting, but does fire up, but this morning it started and I stopped to get coffee and then it wouldn't start. its not the battery, no clicking. Just the word "deck" and then the number "83989" showed up in display. I desperately need to know what could possibly be wrong before I take it to a mechanic so I know what might have to be fixed

Asked by for the 2000 Chrysler Sebring