* Most likely, you're asking about the Vehicle Speed Sensor (VSS): This is typically located on the transmission. To find it, you'll likely need to access the transmission area, possibly requiring some removal of underbody shielding or other components. It's usually a fairly straightforward sensor with a wiring harness connected to it. A repair manual specific to your 2011 Dodge Caravan year and engine would be invaluable for pinpointing the exact location and provide diagrams.
* Wheel Speed Sensors (WSS): These are located within the wheel hubs, one at each wheel. Accessing these requires removing the wheels.
To find the exact location:
1. Consult a repair manual: This is the best resource. A Haynes or Chilton manual for your specific year and model will show diagrams and step-by-step instructions. You can also find online versions, though be cautious about their accuracy.
2. Use a wiring diagram: If you have a wiring diagram for your Caravan, trace the speed sensor circuits to locate the connector.
3. Search online forums: Dodge Caravan forums (like on sites like DodgeForum.com) may have threads discussing speed sensor location and replacement, possibly with pictures.
Caution: Working under a vehicle can be dangerous. Always use jack stands, never rely on a jack alone, and take appropriate safety precautions. If you are not comfortable working on your vehicle, take it to a qualified mechanic.