What is wrong here?

you don`t say if you ever had codes pulled from the tcm or if you installed a new tcm and not a used one.if a used one you may have a bad one.also you may have to have the tcm programed to your vehicle.if in limp in mode there possibly a problem internal to the transmission.you need to have it checked out a tranny shop that you trust or is recomended by several people.

go ing into limp in mode probly internal transmission iussue

i have had luck replacing the solenoid packs on these models but i usually had a 12 shift or 23 shift code stored in the tcm controller

It depends. Are there codes in the computer now? Has it bee reset since you replaced the input speed sensor? If the codes are still in there, the transmission may still be in limp-in mode.

Your transmission is computer controlled. Trying to diagnose or repair it without the ability to interface with the computer that controls it about the same as surfing the internet with no monitor. If you push the right buttons and click your mouse just right, you might get to the page you are looking for (not likely, but possible). However, when you do get there, you still won't know it....

Many times on Chrysler products, one or both of the speed sensors screwed into the front of the transmission will fail, and cause the tcm to go to limp mode. Also make sure you have power to the tcm. Someone with a scanner can check these for you, or the speed sensors are less than 20 bucks each, replace them both and cross your fingers. If the transmission has internal problems, the tcm will sense this and go into limp-mode as well.

Its very possible that the transmission output speed sensor has gone bad. The output speed sensor is what the speedometer reads for vehicle speed. When you open the hood and look straight down at the front of the transmission you will see two sensors that screw into the side of the transmission case that are about the size of a half dollar, the output speed sensor will be the one on the far right side.

This problem is associated with an error of P0700. The p0700 DTC in the PCM is just to refer you to check for DTC's in the TCM ( transmission control module ), since it is not emissions related you will have to see if your diagnostic tool can access the TCM. if not you'll likely have to go to a dealer. When the TCM registers a failure it goes into limp- in mode, if your car still functions it is not the output speed sensor, without knowing the DTC the input sensor is just a guess, it is a cheap sensor and fairly common to fail. This 1st gear stuck issue can also be related to Solenoid. This may have damaged the Cables. Thank you Sir, Have a nice Day.

THERE MUST BE SOME FAULT CODES STORED IN TCM..WHEN A FAULT OCCURS,THE TCM SHUTS THE POWER FEED OFF TO THE SHIFT SOLENOIDS IN THE SOLENOID PACK SO ALL YOU HAVE IS SECOND GEAR(LIMP MODE)..IS YOUR SPEEDOMETER WORKING?IF NOT IT MAY BE THE OUTPUT SPEED SENSOR IS BAD..YOU SHOULD GET TCM SCANNED FOR FAULT CODES..I HOPE THIS HELPS

Firstly, disconnect the battery and leave it for a few hours. Reconnect and try the car again. This resets the memory in the TCM. If the car picks up the faults again, it will go into limp mode again after a short while. If it's been a while since you changed the fluid, then put some seafoam transtune in to clean all the parts and plates. Then after a few days at least, preferably a week, go for a fluid and filter change. After this, you'll probably find it will go into limp mode again, just disconnect the battery again and reconnect after a few hours. I had the same problem in my chrysler T&C. I left seafoam in it for a week and it cleaned up all of the gum and varnish build up on the shift solenoid pack and plates.

If the problem persists, and after you find it allows you to change gears for a while and then goes into limp mode, it could be gummed up solenoid pack, or input speed sensor.

Go to o'reillys and plug in their diagnostic tool. It should provide you with the fault codes if any. If no codes, then your TCM and ECM are in good shape, and if you're lucky then it'll be something simple like a sensor, or solenoid. Try cleaning it first with seafoam transtune in the fluid for a week.

If all else fails, and their are fault codes, then take the car to a trusted transmission repair shop for a road test. The computer could be picking up slippage and making the car go into limp mode. This could be the clutch plates if no errors with the TCM, ECM are present, and you've ended up checking out the input speed sensor, and solenoid pack. The latter can cause hard shifting and slippage too, if the seed sensor is set to signal when to change gear, but the new oil, or old oil have made the friction slightly different to what it is used to or within factory limits. Firstly try reseting the TCM by disconnecting the battery for a while and see what happens.

Good luck