Error Code P0721: What It Means & What To Do?

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Error code P0721 can be described as Output Speed Sensor Range/Performance. This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another.

This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

The P0721 error code indicates that the transmission control module is not converting incoming pulse signals properly. This fault code would be triggered up when the PCM/ECM would determine that there are some defects in the OSS sensor. But it might still be able to function by substituting values from other sensors to determine torque converter operation, shift timing, as well as the pressure of the EPC.

What causes this problem with the Output Speed Sensor Range/Performance?

• Connector might be corroded or damaged
• Inaccurate wiring
• Inoperative coolant temperature sensor
• Transmission valve body might not be functioning properly
• There can be restricted hydraulic passages
• Damaged output speed sensor
• Distorted PCM
• The fluid might be contaminated
• Issue of clogged transmission filter
• Flaws in the shift solenoid

1. Turbocharger - A faulty Turbocharger can be troublesome. You can always rely on us as we have best auto parts for our customers.
2. Powertrain Control Module - If everything is alright with Turbocharger, then there is surely some defect in Powertrain Control Module. Get it replaced before the situation gets worse.
3. Automatic Transmission Sensor - P0721 code can display due to some issues in the Automatic Transmission Sensor. So, it is very important to replace the Automatic Transmission Sensor with us at equitable prices.
4. EGR Valve Gasket - Do you remember when was the last time you got your car EGR Valve Gasket checked up? A dirty EGR Valve Gasket can cause a lot of issues like displaying P0721 code.
5. Engine Control Module - Poor Engine Control Module can cause a lot of difficulties, so why not get it replaced at time?
6. Engine Wiring Connectors - Are there some faults in your Engine Wiring Connectors? Don’t waste time and get them replaced or else P0721 code can turn up.
7. Oil Pressure Sender - OBD Code P0721 can appear because of faulty Oil Pressure Sender.

There could be countless symptoms which that would accompany with this fault code. Willing to know some common symptoms of OBD Trouble Code P0721? Your wish is our demand. Have a look at them below:

Common Symptoms

• Speedometer reading might not be proper
• Some problems related to shifting
• Appearance of the service engine soon warning light

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• If there are some faults in the output speed sensor, then it should be replaced
• Carefully replace the input speed sensor
• Make sure to replace the defective wires as well as connectors
• Carefully drain and then refill the transmission fluid
• The malfunctioning powertrain control module should be replaced properly
• Replace or repair the faulty turbocharger
• You can always restore the defective coolant temperature sensor

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0721 code to be stored:

• A number of mechanics will start by removing the OSS to see if it’s the root of the problem.
• If any of its teeth are missing or have become worn, they’ll need to be replaced, but the code will most likely disappear after the OSS is repaired and reinstalled.
• The resistance put forth by the OSS should also be tested properly.
• Carefully inspect the wiring harness for any indication of defective or loose connections.
• Dirty terminals would be enough to cause the code as well. In vehicles with TFT (transmission fluid temperature) sensors in-line with the OSS sensors, the former should also be checked for resistance.

Common Mistakes When Diagnosing The P0721 Code

• Some faults in the transmission control module
• Issues related to the wiring
• Failure in the output shaft speed sensor
• Powertrain control module might be defective