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

NOTE: This DTC may be induced by an antilock braking system fault that allows the brakes to lock during braking.

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