DTC P0721-27: Output Shaft Speed Sensor Circuit Range/Performance - Signal rate of change above threshold: Action

NOTE: This DTC may be set by an antilock braking system fault allowing the brakes to lock during braking

Using the manufacturer approved diagnostic system, check the anti-lock brake system control module for related DTCs and refer to the relevant DTC index. Using the manufacturer approved diagnostic system, clear the DTCs and retest. If the fault persists, install a new transmission control module