The P0722 code means the transmission control module is not receiving a signal from the output shaft speed sensor. This sensor provides data about the rotational speed of the output shaft, which is used to determine shift timing. When the signal is missing, the system may shift improperly or enter limp mode.
The sensor itself can fail internally, providing no signal to the module.
Wiring between the sensor and the transmission control module may be broken, frayed, or corroded.
A poor connection at the sensor plug can interrupt the signal.
A rare internal fault in the module could prevent it from processing the sensor signal.
No, the PCM is seldom the cause; the sensor, its wiring, or connector are far more likely to be responsible.
A poor ground can affect sensor signals, but it is usually identified during wiring or connector inspection.
Sensor prices vary by vehicle, but they are generally inexpensive compared to a module replacement.
Usually not; clearing the code and performing a drive cycle will allow the system to relearn normal operation.