The P0500 engine code on the Dodge Neon indicates a problem with the vehicle speed sensor. The speed sensor governs shift points for the transmission, and if the vehicle has cruise control, tells the computer when to increase or decrease speed for the cruise control speed setting. If the speed sensor malfunctions, the transmission will not shift properly, and will affect fuel mileage and how the car runs.
Unplug the vehicle speed sensor, located on the transmission. Remove the retaining bolt, using the appropriate socket. Pull the speed sensor out of the transmission.
Insert the new sensor into the transmission, pushing it in as far as it will go. Tighten the retaining bolt firmly. Plug in the sensor.
Plug the code scanner into the data link port under the driver’s side dash. Turn the key to the “On” position. Press the “Erase” button the scanner to erase the code.
