Code question

I'm pretty sure that 12 means that the battery has been recently disconnected and 55 means "end of codes".

What sort of trouble are they having?

Dodge-Him wrote:

Your "1 2 5 5" is a 12 followed by a 55.

Translation, no flash codes stored. What is the nature of this trouble your sister in law is having with her '89 Caravan 3-litre?

"Dodge-Him" If you ran into that much water to get the battey wet you may be swapping out alot of other things down the road

If the water was that deep I would check the transmission for water contamination too.

If water got in to the engine you likely have major problems. Water is non compressible so if it gets pulled in to the cylinder something is going to break. Usually a rod bends. Check your compression first to see what the numbers look like.

Next step I would take would be to do a complete "tune up" since you already know it needs plugs and wires.

Steve B.