[tempfixit]

First I would check all fluid levels. Add some fresh gas if you have not to this point or a additive to eliminate any moisture accumulated in tank. Go to a autoparts store like Autozone or Checkers and have them read and clear the existing codes.They will do this free of charge. Post any codes they find.

If you get the limp mode in the transmission again pull to side of road and turn off engine, wait a couple of minutes and start driving again too see if it goes to limp mode again. )Limp Mode is transmission staying in 2nd gear so you can get to a safe place to investigate problem) Have the transmission filter and fluid changed, USING ATF + 4 FLUID ONLY, DO NOT LET THEM USE DEXRON as this hurts Mopar Transmission. I do not recommend any fast lube places to do this becuase they install Dexron with a additive.

When the battery was changed it caused the PCM and the TCM to relearn the driving patterns.

Hope this helps. Hope fullly someone with more knowledge will chime also.
Keep us posted.