DTC P0721 Output Speed Sensor Circuit Range/Performance: DTC Detecting Condition

WARNING: This page is about a different car, the 2007 Kia Optima, 2007 Kia Magentis, 2006 Kia Optima, and 2006 Kia Magentis. However, it is still accessible from the selected car via links, so may be relevant.

DTC CHART

Item	Detecting Condition	Possible cause
DTC Strategy	Speed rationality check	Signal circuit is open or short Sensor power circuit is open Sensor ground circuit is open Faulty OUTPUT SPEED SENSOR Faulty TCM (PCM)
Enable Conditions	Vehicle speed is over 50Km/h (31 Mile/h) in D,3,2, L (A/T range switch) and SP (SPORTS MODE)
Threshold value	If the output from the output speed sensor is continuously 50% lower or higrer than the value calculated by vehicle speed sensor
Diagnostic Time	More than 1sec
Fail Safe	Locked into 3rd or 2nd gear Apply an electric current to Solenoid valve Manual shifting is possible (2nd --> 3rd, 3rd --> 2nd)