Thanks for the information

I cleaned every ground I could find, pulled the cover near the battery, loosened and re-tightened all the connectors. Used my battery terminal cleaners to clean both terminal connectors and battery posts, trickle charged the battery all night on a tender and performed the rcm re-solder.

There is no evidence of water in the RCM/ECU control box, none on, in or around the TCU on the passenger floor, and only an old trace of dried water on the trunk floor, under all the styrofoam. I wiggled all the connectors to the black box, and there is no evidence of water inside or outside.

Next, I'm going to replace the battery, and install the old one in my '72 Dodge, which has a 10+ year old Interstate battery. The manufacture date of the Crossfire's battery is February, 2010. The Energizer has 770 cca and 920 ca. Tested with a voltmeter: 12.85 volts while off, 14.5 volts while running, and 10.6 volts while cranking.

Will let you know the result of replacing the battery. I'm thinking it's something expensive, instead, but worth a shot. If that doesn't work, new battery cables. After that, Chrysler dealer to get a proper scan. p0600 on my scanner gives a non-specific fault.