I have a 2004 TJ Rubicon with the 4.0 and automatic (42RLE). About 4 years ago, I was having shifting issues between 1st and 2nd where it felt like a slip/missed the gear, but would only do it once in a blue moon (never threw a code), and would shift into 2nd after about 1-2 seconds of stuttering. I tried everything (sensors, new fluid, new filter, checked wiring, new TCM) and eventually got the entire thing rebuilt. This still didn't fix my issue, and more recently I was on the freeway when it was switching around between 3rd and 4th, and seemed like it couldn't make its mind up. It went into limp mode and luckily I was only going about 50 at the time and was about a quarter mile from home. About a month has passed and I've taken it to trans shops and different mechanics, and have scoured these forums for possible solutions. I replaced speed sensors, have a fairly new battery, cleaned ground connections, and inspected wires going to and from the ECU to TCU, and to the trans itself. It was throwing a P1698 code and after a week of the same answers, and since I had a factory TCU installed in 2018, I went ahead and got an ECU from wranglerfix.com. The first one they sent me was apparently messed up and threw a P0601 code. Sent it back, got my replacement this morning, and threw it in, and it had a severe misfire on cylinder 2 (P0202). I am at a total loss and cannot keep throwing money at it. If anyone has any ideas I would greatly appreciate it.
