Fault code P0722 – a step-by-step guide to diagnosing and fixing it

Error code P0722 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system uses DTC P0722 to detect a problem with the transmission's output speed sensor, which is not sending a signal to the control unit. This error code affects the automatic transmission and its electronic components. The code may have slightly different names for different manufacturers, but always refers to the missing transmission output speed sensor input.

What causes can this error code have?

• Defective transmission output speed sensor
• Damaged or interrupted sensor cable
• Loose or corroded plug connections on the sensor
• Defective transmission control unit (TCM)
• Mechanical damage to the sensor wheel or sprocket
• Dirt or metal chips on the sensor
• Faulty ground connection of the sensor
• Short circuit in the sensor wiring

What symptoms occur in parallel with error code P0722?

• Shifting problems: The automatic transmission shifts irregularly or gets stuck in a gear. Jerky drive: Noticeable jolts when accelerating or while driving. Emergency running program: The transmission switches to safety mode and limits the available gears. Speedometer failure: The speedometer may not work correctly or not at all. Increased fuel consumption: Fuel consumption increases significantly due to inefficient gear changes. ABS problems: Anti-lock braking system and stability control may be affected.

How can the problem with error code P0722 be rectified?

• The repair requires a systematic diagnosis of the transmission electronics and the sensor system.
• Replace and calibrate the output speed sensor completely, including checking the correct mounting position and the air gap to the sensor wheel
• Measure the entire sensor cabling from the sensor to the control unit, repair or replace damaged cables, clean all plug connections and treat with contact spray
• Diagnose transmission control unit (TCM) and replace if defective, then carry out basic setting and adjustment of transmission parameters
• Change the transmission oil and replace the filter, as metal shavings or dirt can impair the sensor
• Check the sensor wheel or gear rim at the gearbox output for damage and replace if necessary, carry out mechanical adjustment
• Carry out a complete electrical diagnosis with a professional OBD scanner, delete fault memory and test drive to check function