DTC P0121: ACCEL POS SENSOR VOLTS DO NOT AGREE W/IDLE VALID SIGNAL Monitor & Set Conditions Accelerator Pedal Position Sensor (APPS) voltage is monitored with the throttle at less than 15 percent of full throttle for about one second or when the vehicle speed is greater than 10 MPH for about one second. DTC may be stored if the idle valid signal indicates an idle condition while APPS signal voltage does not indicate an idle condition or if the idle valid signal does not indic