P0722 No output speed sensor signal

OBD-II Trouble Code - P0722 - Data Sheet

No output speed sensor signal

What does trouble code P0722 mean?

This is a generic transmission diagnostic trouble code (DTC) applicable to OBD-II vehicles. This may include, but is not limited to, vehicles from VW, BMW, Mercedes, Chevrolet, GMC, Allison, Duramax, Dodge, Ram, Ford, Honda, Hyundai, Audi, etc. While general, exact repair steps may vary depending on from the year. , make, model and equipment of the power unit.

The P0722 OBD-II DTC is associated with the Transmission Output Speed ​​Sensor.

When the powertrain control module (PCM) detects a malfunction in the output speed sensor circuit, many codes can be set, depending on the specific vehicle and the specific automatic transmission.

Some of the most common code responses related to transmission output speed sensor problems are codes P0720, P0721, P0722, and P0723 based on a specific fault that alerts the PCM to set the code and activate the check engine light.

The Transmission Output Speed ​​Sensor provides a signal to the PCM that indicates the rotational speed of the transmission output shaft. The PCM uses this reading to control the shift solenoids. Solenoids channel fluid between the different hydraulic circuits and change the transmission ratio at the right time. The output speed sensor may also monitor the speedometer, depending on the vehicle and transmission configuration. The automatic transmission is controlled by belts and clutches that shift gears by applying fluid pressure to the right place at the right time. This process begins with the transmission output speed sensor.

P0722 is set by the PCM when it does not see a signal from the output speed sensor.

What is the severity of this DTC?

The severity of this code usually starts at moderate, but can quickly progress to a more serious level if not corrected in a timely manner.

Transmission speed sensor photo:

What are some symptoms of code P0722?

In addition to turning on the Check Engine light, a P0722 code may also be accompanied by a number of other symptoms. These include:

• Incorrect switching
• Drop in fuel efficiency
• Stalls at idle speed
• Engine misfiring
• Silences when driving at speed
• Check Engine light is on
• Gearbox does not shift
• The gearbox shifts approximately
• Possible misfire-like symptoms
• The PCM puts the engine in braking mode
• Speedometer shows incorrect or erratic readings

In some rare cases, the Check Engine light comes on without any additional symptoms. However, if the problem persists long enough, even in these cases, there are usually problems with the car's operation.

How does a mechanic diagnose a P0722 code?

To diagnose the problem, the mechanic first uses an OBD-II scanner to identify the stored code P0722 and any other codes that may be associated with it. Before addressing the P0722 code, they will first resolve any other codes and then retest the system to see if the P0722 code is stored again.

The mechanic will then visually inspect the output speed sensor, its wiring and connectors to ensure there is no open or short circuit. They will then inspect and test the shift solenoid valve and valve body to diagnose the cause of the problem before replacing or attempting to repair any component of the system.

What are some of the common causes for the code?

Reasons for this P0722 transfer code may include:

• Defective output speed sensor
• Dirty or contaminated liquid
• Dirty or clogged transmission filter
• Defective coolant temperature sensor
• Defective transmission valve body
• Limited hydraulic passages
• Defective shift solenoid
• Corroded or damaged connector
• Faulty or damaged wiring
• Defective PCM
• Faulty or damaged transmission output speed sensor
• Faulty engine coolant temperature sensor
• Faulty or damaged shift solenoid
• Contaminated transmission fluid
• Problem with hydraulic block
• Output speed sensor wiring or connector problem

What are some steps to troubleshoot the P0722?

Before beginning the troubleshooting process for any problem, you should review the vehicle-specific Technical Service Bulletins (TSB) by year, model and transmission. In some situations, this can save you a lot of time in the long run by pointing you in the right direction.

The first step is to make sure the fluid level is correct and check the condition of the fluid for contamination. You should also check the vehicle's records to check when the filter and fluid were last changed, if possible. This is followed by a thorough visual inspection to check the associated wiring for obvious defects such as scratches, abrasions, exposed wires, or burn marks. Check connectors and connections for security, corrosion and contact damage. This should include all wiring and connectors for the output speed sensor, transmission solenoids, transmission pump and PCM. Depending on the configuration, the transmission link must be tested for safety and freedom of movement.

Advanced steps

The additional steps become very vehicle specific and require appropriate advanced equipment to be performed correctly. These procedures require a digital multimeter and vehicle-specific technical reference documents. You must follow the specific troubleshooting instructions and sequence of actions for your vehicle. Voltage requirements can be highly dependent on the specific vehicle model and powertrain configuration.

Continuity checks

Continuity checks are always performed with power removed from the circuit to avoid short circuiting the circuit and creating additional damage. Unless otherwise specified in the datasheet, normal wiring and connection readings should be 0 ohms of resistance. Resistance or no continuity indicates faulty wiring that is open or shorted and requires repair or replacement.

Normal repair

• Replacing fluid and filter
• Replacing a defective output speed sensor
• Repair or replace a faulty gear shift solenoid
• Repair or replace a faulty transmission valve body
• Flushing the transmission to clean the aisles
• Cleaning connectors from corrosion
• Repair or replacement of wiring
• Flashing or replacing PCM

Common P0722 Diagnostic Mistakes

• Engine misfire problem
• Internal transmission problem
• Transmission problem

Hopefully the information in this article has helped point you in the right direction for resolving your transmission output speed sensor DTC problem. This article is for informational purposes only and specific technical data and service bulletins for your vehicle should always take priority.

How serious is the P0722 code?

While a P0722 code may sometimes have no symptoms other than a lit Check Engine light, in most cases, the symptoms can make driving difficult or nearly impossible. Stopping at idle or at high speed can be incredibly dangerous, so don't wait for this problem to be fixed.

What repairs can fix code P0722?

The correct repair will depend on the problem that caused the P0722 to set. Some of the more common repairs that can resolve these issues include:

• Repair or replace a damaged or defective transmission output speed sensor.
• Repair or replace a damaged or defective engine coolant temperature sensor.
• Repair or replace a damaged or defective shift solenoid.
• Flushing the system and replacing the transmission fluid.
• Replacing a defective hydraulic unit.
• Replace damaged or corroded output speed sensor circuit wiring or connectors.

Additional comments to consider regarding code P0722

Code P0722 may have a simple solution, but if left untreated, it can cause serious issues with the vehicle's transmission and driver safety. Also, if the Check Engine light comes on when you take your vehicle for an emissions check, it will not pass. This can cause problems with your vehicle's legal registration in your state.

How to Diagnose and Fix P0722 Engine Code - OBD II Trouble Code Explain

Need more help with the P0722 code?

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NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.