Hey new here im Dee. I have a 2014 dodge avenger sxt. Here's the problem I'm throwing a code P0869. I looked it up -LINE PRESSURE HIGH. Ok so how do i fix it? I've taken it to a transmission shop 2 months ago he drove it around said there was nothing wrong with he trans and cleared the code. The code came back. Been driving it for the past month and half. A week ago it double shift when I was passing someone. I went to slow down to maintain my speed and it would allow to go more than 20mph. Would not shift. So today I took it back to the same tranmission shop told them what happened he drove it again and said i needed a new transmission and they gave me 2 printouts of cost. Before I left he went out and cleared the codes. I got into drive it and the check engine light didn't come on and it started shifting just fine. Talked to my aunts mechanic husband and he said its the tcm. So I guess my question is do I need a new transmission or do I replace the tcm. And if I replace the tcm where is it located and whats the price and do I have to get it at a dealership? Please help. Thank you.