1996 dodge ram 1500....p0505

P0505 is a code for your IAC (idle air control valve) located right below the TPS (throttle positioning sensor). Beware it is not necessarily the sensor. If you use a test light on the connection coming to it while the vehicle is running and rev the motor each terminal (probably four) should flash. In this case it is most likely your sensor. If not it is in the wiring or your pcm.