HI every body i Have probleme with my Car it's Dodge Grand Caravan ES .engine size is 3.3L1994 . i have check engine Light when the light show up my engine start shacking some friends told me it's sensors problem but i don't know wich of them them or the location . i am asking you guys to help me to fix it thanks .

Get the wiring standard for trailer socket on car / caravan .
Something like this
http://www.caravantalk.co.uk/caravan-advice/new-to-caravanning/electrics-guide/12-volt-systems
Then get a 12v probe and test the voltage is coming out the correct pins on the car when the tail lights are turned on.
http://www.amazon.com/6-36V-Circuit-Test-Probe-Indicator/dp/B0065R1CK4
Check the Earth Connections on the caravans tail lights.
Check the Caravan has an earth connection to the car body.
https://caravanchronicles.files.wordpress.com/2012/01/caravanchronicles-wiring1.jpg
see how pin 3 shows an earth wire it would have a wire on car socket pin 3 going to the car body. If the earth wire is corroded or broken I think the tail lights on the caravan would not work. It may be a different pin on your setup .

transmission valve body seals are failing

Do not shut off the Van and check the lights.... Did you have your Transmission serviced lately? Common problem with this transmission.

Your problem could quite possibly be an internal issue with PCM/ECU

You always check for codes & resolve those
issue first,when ever a check light comes on.

This is the BCM,,Body Control Mogule located under the dash by the brake pedel

P1775, Transmission system silnoid

If you have an Advance Auto Parts store where ever you are, they will read the code and tell you exactly what to code is and what it means. Any mechanic who "guesses" isn't a mechanic at all - he's a thief. Emissions leak can be any number of things, but not the gas cap!

Hi, this light is signaling an issue the concerns the state of a failed sensor or electrical component. I recommend taking this vehicle to a dealership or local mechanic as soon as possible for a diagnostic run on the ecm. this diagnostic scan will tell you and your mechanic what the specific issue is and, how to fix it.

In most cases, it will be a failed sensor or a failed sensor wire/housing.

CHECK THE EXHUST MANIFULD IS CKACK . THE 02 SENSOR GERING ARI FROM THE CRACK MANIFUL

I'd go for the free scan at Autozone or Pep boys, then get back to us, if you need more advice.