P1818 = Transmission fluid Pressure Valve Position Switch Indicates Drive without Drive Ratio.
Have you had any work done to the vehicle where the electrical connection to the transmission had been disconnected and the ignition key turned on? If so, this will cause the code you have.
Make sure that the electrical connection to the transmission is well connected.
To trace this code further you will have to have a technician connect a scan tool to your vehicle and trace the problem step-by-step.
Tuesday, August 5th, 2014 AT 6:52 PM