DTC P0721-00: Output Shaft Speed Sensor/Sensor Output Range Malfunction (TCM) (Us): Outline

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0721:00 (TCM, ET6A-EL, ET6AX-EL, US) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Output shaft speed sensor/sensor output range malfunction
Detection condition	Under the following condition, the output shaft speed is 13, 560 rpm or more in forward or 2, 000 rpm or more in reverse for a continuous 1 s: Battery voltage is 8 V or more.
Fail-safe	Inhibits learning control. Inhibits manual mode. Inhibits neutral idle control. Inhibits AAS.
Possible cause	Output shaft speed sensor malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable