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P0722 OBD-II Trouble Code: Output Speed Sensor No Signal

Check Engine Light

P0722 code definition

A P0722 code is stored when the PCM gets an incorrect or irrational input signal from the transmission’s output speed sensor. With an incorrect, intermittent, or inaccurate signal, the transmission has no accurate information about speed, and it cannot create an appropriate shifting strategy.

What the P0722 code means

Basically, when the PCM cannot detect a consistent or expected speed signal from the transmission’s output speed sensor, it will be unable to correctly predict how and/or when to shift up or down appropriately. When this happens and the P0722 code is saved, the Check Engine light will turn on, and there may be other symptoms, as well, including harsh shifting.

What causes the P0722 code?

There are a few common issues that can cause a P0722 code to be stored, including:

  • A faulty or damaged transmission output speed sensor
  • A faulty temperature sensor for the engine coolant
  • A faulty or damaged shift solenoid
  • Contaminated transmission fluid
  • A problem with the valve body
  • A problem with the wiring or connector for the output speed sensor

What are the symptoms of the P0722 code?

In addition to illuminating the Check Engine light, a P0722 code can also come with a number of other symptoms. These include:

  • Improper shifting
  • A drop in fuel efficiency
  • Stalling at idle
  • Engine misfiring
  • Stalling while driving at speed

In some rare instances, there will be no additional symptoms to the Check Engine light turning on. However, if the problem is left long enough, even these cases will generally develop problems with vehicle performance.

How does a mechanic diagnose the P0722 code?

To diagnose the problem, a mechanic will first use an OBD-II scanner to identify the stored P0722 code and any other codes that may be related to it. Before addressing the P0722 code, they’ll first address any other codes and then retest the system to see if the P0722 code is stored again.

After that, the mechanic will visually inspect the output speed sensor, its wiring, and its connectors to ensure that it doesn't have an open or shorted circuit. They will then inspect and test the shift solenoid and the valve body to diagnose the cause of the problem before replacing or attempting to repair any one component in the system.

Common mistakes when diagnosing the P0722 code

When the P0722 code is set, the symptoms can look much like an internal transmission issue, a misfiring engine, a malfunctioning driveline, a problem with the fuel delivery system, and other issues. That’s why it’s important to check the code before attempting to diagnose the problem.

How serious is the P0722 code?

While a P0722 code can occasionally have no symptoms other than an illuminated Check Engine light, in most cases the symptoms can make driving difficult or nearly impossible. Stalling at idle or at speed can be incredibly dangerous, so don’t wait to get this issue taken care of.

What repairs can fix the P0722 code?

The proper repair will depend on the problem causing the P0722 to be set. Some of the most common repairs that can fix these problems include:

  • Repairing or replacing a damaged or faulty transmission output speed sensor.
  • Repairing or replacing a damaged or faulty engine coolant temperature sensor.
  • Repairing or replacing a damaged or faulty shift solenoid.
  • Flushing the system and changing the transmission fluid.
  • Replacing a bad valve body.
  • Replacing damaged or corroded wiring or connectors for the output speed sensor’s circuit.

Additional comments for consideration regarding the P0722 code

A P0722 code could have a simple solution, but if it’s left untreated, it can cause major problems for the vehicle’s transmission and the driver’s safety. Plus, if the Check Engine light is illuminated when you take your car to get the emissions tested, it will not pass. This can cause problems for legally registering your car in your state.

Need help with a P0722 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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