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Most speed sensors are three-wire sensors that monitor transmission input speed. Input and turbine sensors are similar, and some vehicles rely on readings from multiple sensors. The most common OBD-II scanner error code P0715 problem involves the sensor designated ‘A’ by the vehicle manufacturer.

Refer to the service manual for your vehicle make, model and engine type to locate input/turbine speed sensor A. In addition to an OBD-II diagnostic scanner, a digital volt/ohmmeter can be helpful for testing resistance and continuity. Learn more about error code P0715 and how to fix a faulty or malfunctioning input/turbine speed sensor A circuit.

What Does the Code P0715 Mean?

OBD-II codes combine letters and numbers to identify which system in a vehicle is not functioning in accordance with programmed specifications. Generic powertrain codes start with the letter ‘P’ to indicate that a component in this system, which includes the engine, transmission, drive shafts, differentials and final drive and also impacts the exhaust system is not operating properly.

The numbers in trouble codes are helpful for narrowing down the cause of a problem to a particular part or component. In this case, the numbers 0715 point toward the input/turbine speed sensor circuit designated ‘A.’ If you are working on a car or truck that has more than one input or turbine speed sensor, refer to the manufacturer’s manual to identify which sensor is designated ‘A’ and start by inspecting and testing this component. It may be necessary to replace faulty speed sensors, related components or damaged wiring to clear this code.

What Can Cause an OBD-II Scanner Error Code P0715 Problem?

The input/turbine speed sensor relies on the completion of an electromagnetic circuit as an input shaft or reluctor wheel on the transmission main passes and causes interruptions. This pattern is transmitted to the PCM which converts the data into waveforms that are read as transmission input or turbine speed. The system compares this reading with engine RPMs, engine load percentage and vehicle speed to calculate the right input speed RPM. If the actual speed and calculated speed are not the same, trouble code P0715 is set. Related speed sensor trouble codes include P0500, P0501 and P0503.

How Do I Fix Trouble Code P0715?

An input/turbine speed sensor is usually found behind the torque converter at the transmission input shaft. Start by inspecting the condition of the sensor as well as the wiring, connections and surrounding parts. If you see signs of corrosion or metal debris, this buildup could be preventing an electromagnetic circuit from completing. To remove a sensor for cleaning, further inspection and testing, it may be necessary to remove a bolt or stud or extract a sensor that is threaded directly into the transmission case. If this is the case, be aware that transmission fluid may leak from the location.

Visually inspect the part and remove any metal debris from magnetic contacts. If you have access to a digital volt/ohmmeter, you can also test the input/turbine speed sensor to determine whether the part complies with specifications set by the manufacturer. It is also a good idea to disconnect and test controllers. Shorted or open wiring may be the cause of a P0715 code. It may be possible to fix defective circuits, otherwise installing a replacement input/turbine speed sensor should clear this code.

Clearing this code may require the replacement of an input or output speed sensor or related components such as connectors, a reluctor ring, shaft or wiring. A faulty transmission torque converter could be another potential source of this trouble code and related codes, as could problems involving the PCM itself.

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