My 2006 Wrangler has 112000 miles. I purchased it in 2010 with 40000 miles. I have followed service manual meticulously. Automatic transmission will not shift up from 2nd gear. This happened suddenly with no prior warning (noises, vibrations, check engine light etc..). Trans fluid is at proper level. I have not pulled the code for the check engine light that came on when shifting problem occurred. I’m figuring I’m probably going to have some serious and expensive trans work. Just wanted to post on here in case anyone knows of a possible easy fix so I could trouble shoot first. I’ve combed through the forums and found a few possibilities but nothing specific. Any help greatly appreciated!