P0722 - OUTPUT SHAFT SPEED (OSS) SENSOR - NO SIGNAL

DTC code P0722 OBDII is set when the PCM (Powertrain Control Module) does not detect any signal from the Output Shaft Speed Sensor (OSS). Usually, this sensor consists of a slip ring whose teeth interrupt a magnetic field, thus, it creates a series of pulses which are interpreted by the PCM as rotational speed. It should be noted that the data sent by the OSS sensor is also used to calculate transmission shift strategies.

When the system is operating properly, the PCM expects to see a constant increase in transmission rotation speed as the vehicle accelerates. This information is compared with input from other sensors and when a predetermined shift point is reached, the Powertrain Control Module (PCM) instructs the Transmission Control Module (TCM) to initiate an appropriate shift.

If the PCM does not receive a signal from the OSS sensor, i.e. it has no information required for transmission control, the diagnostic code P0722 OBD2 is set.

• Warning light on.
• Erratic gear changes.
• The transmission may not change at all.
• Increased fuel consumption.

Fault code P0722 OBD2 is set because of the following reasons:

• Electrical connections may be poor due to badly damaged OSS sensor cables or connectors.
• The output shaft speed may be defective.

The steps to solve the DTC code P0722 OBD II are:

• Locate the OSS sensor and verify that all cables and respective connectors. If you find that any of these components are defective, you should make the appropriate repairs or, if necessary, replace the component.
• Check the reference voltage, which should be equal to or close to 5 volts. If no voltage reference is present, make sure there is continuity of the cable. Change the cable if necessary.
• Check the signal circuit resistance between the connector and the PCM Compare with the manufacturer's specifications and if they are not within those parameters, you should change the Output Shaft Speed Sensor (OSS).
• Remove the sensor from the transmission and then check it for damage, replace it if necessary.