I have a 2004 Dodge Caravan 3.3 Stuck in limp mode.I have done the easy/ cheap stuff but still no luck. I started with the input and output sensors. The out sensor went bad about 3 years ago. If you want to test the input and output sensors you can take them out and hook up a voltmeter to the 2 pins on the sensor. With the meter in the ohm mode you can run a magnet in front of the sensor. The meter should change. If it does not then the sensor is bad. The input and output sensor connectors may look the same but they won't plug in if you have the sensor in the wrong spot they are keyed differently.I also had a couple of wires in the harness that were bad. If you think your harness is bad you can take it completely off the van and work on it on your work bench. The harness for the trans is seperate from the engine harness.There are 4 connectors on the trans and 2 in the drivers front inner fender.The inner fender is where the ECM (Electronic Control Module)is that runs the Engine/trans. The bad wires were in this area on mine. The ECM on mine had water/salt damage in the connector so I also had to replace it.The down side is that I'm still in limp mode. I don't feel bad about buying a new ECM because it was going to fail soon from the water/salt damage.The problem now is with the new ECM in I can't get the van to give me any codes. On my van you can look up the codes from the dash. If you put your key in the ignition and turn it back then forward to the run spot 3 times without starting the van it will show the codes in your trip display.It has to be in the trip mode not the mileage mode. I don't have a tach or digtal gauges. My speedometer went out the same time the trans stopped working. Does anybody know if the speedometer gets a signal from the solenoid pack? If not maybe I still have a bad wire somewhere. Thanks

If you lost your speedo at the same time I'd be inclined to say you have a speed sensor issue. You can buy new ones that aren't any good. We've seen alot of issues with the fuse box under the hood corroding inside. Had to replace a few of them. Did you replace the ECM or the trans. controller?

STUFF like this "scares" me ..... all these E sensors and switches ......

I just got a 03 Caravan with a 3.3 a couple of weeks ago ... runs like a top now ... no corrosion issues I can see. uNderhood looks really clean.... and I hope it stays that way.

DID you check codes ?

If it was me, I would change the solenoid pack...

The ECM was programed. If I swap in the old ECM it still won't give any codes. I checked the bottom side of the fuse box and is doesn't look to bad.Not as clean as I would like to see but not as bad as the old ECM. I just got a service manual from a friend and it has wiring info and trouble shooting tips I will try today. The manual talks about the "electric pinion factor" as a cause for the no speedo but It also said the engine RPM will only go to 2300. I don't have a Tach in the van but I know it will go above 2300 RPM.I'm Thinking it still may have a bad wire in the harness. With the wiring guide and some voltage specs hopefully I can get it going.

Transmission control module...been this route with an 02 Stratus...I changed out the solenoid pack and it did not fix the problem..luckily the dealer swapped it out under warranty for $100, otherwise you're looking at around $500. Might try a bone yard unit...make sure if you pull a bone yard unit it has the same gears, tire size and motor. Otherwise it's got to be re-flashed to input those specs.

Output speed sensor,wires,or tcm,start testing.