P0725 Code: Engine Speed Input Circuit


These days, almost all cars have an on-board diagnosis system that helps to diagnose different error code in our automobile. It is known to everyone that diagnosis of error code and repair is not an easy task. Fortunately, the car’s booklet and the defined steps make that process easier. If your vehicle is diagnosed with error code P0725, it is a sign that there are some faults in your vehicle’s sensor. This error can be generated when there is some mechanical or electrical problem in the vehicle.

Error code P0725 definition

The error code P0725 can be defined as Engine Speed Input Circuit that signifies that there are some faults in the engine speed input sensor signal of the vehicle.

What does the error code P0725 mean?

This error code generates when OBD-II notices some faults with the sensors of your vehicle. The primary function of the engine speed input circuit is to send signals about the relative speed of the engine to the powertrain control module. The PCM then determines the proper shift strategy, which is then sent to the transmission case.


When the PCM is unable to recognize an accurate signal from the input speed sensor for a specific time frame, then the Error Code P0725 is triggered, and the Check Engine light is illuminated.
Inappropriate engine speed input signal can be the result of different issues such as excessive voltages, voltage lacking and PCM may enter into the limp-in mode.

Possible cause of the error code P0725

There are many possible causes of the error code P0725, some of them are:

  • Faults in engine speed input sensor or transmission output speed sensor
  • Faults or worn out engine speed sensor reluctor ring
  • Corroded magnetic tip of the sensor in question
  • The problem in Open or shorted wiring or connectors in the engine speed input circuit
  • The problem in Mechanical transmission that results in transmission or clutch slippage
  • Faults in the crankshaft of the engine
  • Possibly data network issues

Possible symptoms of the error code P0725

You may notice the following symptoms when your vehicle is diagnosed with this error code:

  • Erratic or inoperative tachometer
  • Erratic Shifting of the Automatic transmissions (limp-in mode)
  • Check engine light illuminates
  • Faults id Odometer/ speedometer
  • Harsh Transmission slippage
  • MIL lights on for 10 seconds.

When this error code is detected?

The P0725 error code is detected when there are faults in sensors and because of that TCM fails to receive engine speed input signals from ECM.

The severity of the Error code P0725

This error code can cause faults in transmission and sensors. This can be dangerous and can affect the safety of the vehicle. So you should not ignore this error code and should visit a mechanic.

How to diagnose the error code P0725?

If your vehicle is diagnosed with this error code (P0725), you need to visit a professional immediately. They will scan your vehicle using the OBD-II scanner tool and look for freeze frame data. They will search for any other trouble code that leads to this problem.


Then they will reset the trouble code, restart the vehicle, and take a short drive to check if the code returns. If they do not detect the code, the code is generated mistakenly.
In case, code return after being reset, the mechanic will then go through the wires, connectors, transmission fluids, open circuits, and many other issues. When some issues are found and resolved, they will reset again the code to check whether it returns.

How to fix the P0725 error code?

Depending on the diagnosis of the vehicles, these repairs can fix the error code:

  • Repair the faults of the input speed sensor or output speed sensor
  • Repair the faults wires or connectors
  • Repair the faults of the transmission fluid
  • Repair faults of the PCM (rare)

The effect of error code differs from vehicle to vehicle. These repair methods do not suit for all vehicles, so it is advisable to visit the professional as quickly as possible.

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