Engine light and codes

Scan the computer for code/s and comeback with it if any present.

It's much more likely there is an intermittent break in the wire, most commonly a stretched or corroded terminal in a connector. All it takes is a momentary break for the Engine Computer to detect it, like when bouncing over a pothole, or from the engine rocking when shifting into reverse.

The way a transmission specialist would approach this is to first erase the code, then go on a test-drive with a scanner so he can watch what happens and figure out if there is anything he can do to make the problem act up. If the code comes back right away, that is when there is a hard defect that you can find with an ohm meter or voltmeter.

Check no.3 cyl -sparkplug, compression and injector

Once in limp mode, it should stay there until you turn the ignition switch off and restart the engine. Is that what you mean? If it shifts properly without having to restart the engine, unless this is something new I haven't heard about, it never went into limp mode.

Try fuel injection cleaner and see what happens-don't work take it in and have it further checked-

You're in an area now that I've never worked on or learned about. My best recommendation is to get a copy of Chrysler's service manual. They do a real good job of explaining how circuits are supposed to work.

Sorry; I don't have an answer for that.