2006 caravan P0340. Wife was coming home from work and van wouldn't go over 20mph. She drove it to parking light about 1/2mile. 20 minites she turned it off and it's been fine for 2 days since then. Indicator went off next day. I tested it after the indicator went off and got P0340 indication.

 

http://www.obd-codes.com/p0340

 

ok heres the fix for a many code try this before anything else u have nothing to loose and it works i had code 0340-0344 a can of electrical parts cleaner and some dielectric gease theese computers run on very low voltage low voltage requires a very good connection take the connectors off the comp mine were very clean dont matter spray every thing down with the elec parts cleaner and fill the little holes with the grease this grease will stop moisture from getting in if u have a problem in the rain 99%shure this will fix it ive fixed two of theese cars like this and the guy i got it from fixed four
oh and guys on here like mr. master tech he knos about this but hed rather send u in adifferent direction and drive u nuts oh and a cracked flex plate not like ly i just pulled a motor from a 2003 had six cracks in it no problems with crank codes good luck i would luv to hear if this fixed your ride later
handy man fixes anything lol