Check engine light came on, then digital display said "gas cap".

What is your question?

First the check engine light came on and nothing was on the digital display. I had it hooked up to the computer and the code was for the gas cap. I cleaned it and the light went away for a while. Later the check engine light came on again this time it read gas cap on the display as well. I've changed the gas cap (OEM) and the check engine light and display came on again. Service man at Chrysler said it could be an exhaust issue -having a med. to large leak detected and the car computer can only assume a large leak from the gas cap being loose.