DTC P0721-64: Output Shaft Speed Sensor Circuit Range/Performance - Signal plausibility failure: Action

NOTE: If this DTC is flagged, this may indicate that the vehicle has been fitted with an incorrect front and/or rear differential. Refer to the REAR DRIVE AXLE/DIFFERENTIAL -- LR4/L319 and FRONT DRIVE AXLE/DIFFERENTIAL service information before continuing with the diagnostic steps outlined below.

Using the manufacturer approved diagnostic system, clear the DTCs and road test the vehicle. If the fault persists, install a new transmission control module