The speed sensor is on the outside of the transmission on the drivers side on the extension housing. The thing is if the ECM isn't receiving any speed signal then the vehicle will NOT work so most likely that their is just some water on the wire or the sensor itself is faulty.My check engine light just came on, so I went to Auto Zone and had it checked. Turns out it's an output speed sensor (OSS) Circuit Performance.
Engine running vehicle in drive and the ECM did not detect and OSS signal.
1. Failed output speed sensor
2. Open or short circuit condition
3. Corroded or moisture in connector.
So where is this speed sensor? I'm going to replace it. If that's the case.