P0715 Code - Transmission Input/Turbine Speed Sensor Circuit Malfunction

What does P0715 Mean?

OBD-II Code P0715 is defined as a Input/Turbine Speed Sensor Circuit Malfunction

The purpose of the automatic transmission is to match the engine's optimum power and torque characteristics to the driver's desired rate of acceleration and speed by auto-selecting different gear ratios or 'speeds' to power the wheels.

Code P0715 is triggered when the transmission's Input Speed Sensor isn't providing a reliable or rational signal. This is a critical problem because with out this signal, the Transmission Contorl Module or TCM can't properly shift the vehicle from gear to gear as the vehicle needs to change speed and rates of acceleration.

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What are the common causes of P0715 ?

A P0715 usually has one main cause and other secondary issues that are less common. These include:

• Faulty transmission speed sensor
• Faulty or damaged speed sensor wiring
• Faulty speed sensor electrical connection
• Faulty shift solenoids
• Damaged transmission valve body
• Dirty or low transmission fluid

How do you troubleshoot P0715 ?

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.

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