Chrysler tech until Nov. of last year here. No way to read codes without a scanner, end of story. Not sure what the turn the key three times with the door open trick is, that makes no sense.

If you're thinking its like the older pre-obd cars where you can jump the pins in the data link connector and read them like morse code that is incorrect. Only way to get the codes is to get into the module that generated it.

You need a Chrysler DRB or Star Scan/Snap On Modis with a Chrysler key or like said above, a parts store generic, but sounds like that is not an option. Really, unless the MIL is blinking, (clogged cat or something) its probably not a huge issue. Probably EGR or Evap related.

Whats the car doing, anything noticeable?