P0715: Input/Turbine Speed Sensor "A" Circuit
The transmission input speed sensor signal is faulty.
High risk
Shifting may be harsh or the gearbox may go into limp mode.
Short answer · Can I keep driving with P0715?
With care. The gearbox may shift harshly or stay in one gear. Have it checked soon.
What does P0715 mean?
Code P0715 means the input (turbine) speed sensor signal is missing or implausible. The transmission needs it to control shifts.
Without the input speed signal, the transmission control unit cannot detect slip or time shifts. Many transmissions then select a fixed gear.
What the car does when the code is set
The check engine or transmission warning comes on. Shifts may be harsh or late, the transmission may hold one gear, and the speedometer may show wrong values on some cars.
How the system works
An automatic transmission uses speed sensors to compare the turbine (input) speed with the output speed. From the ratio, the transmission control unit knows which gear is engaged, whether a clutch is slipping and how to time shifts smoothly. The input speed sensor reads a toothed wheel on the input shaft or a clutch drum. If its signal disappears or does not fit the engine and output speeds, the control unit stores a code and often switches to a fixed gear.
Common symptoms
Possible causes
Listed without ranking. The cause on your car depends on make, engine and mileage — see the maker notes below.
- Faulty input speed sensorThe sensor fails or its signal is weak.
- Wiring or connector faultOften at the transmission connector.
- Metal debrisDebris on a magnetic sensor.
- Transmission control unit faultLess common.
How it is diagnosed
- Read live dataCompare input speed with engine speed in a fixed gear.
- Check wiring and connectorsLook for fluid in the connector and damaged wiring.
- Measure the sensorCheck resistance or signal as in the service data.
- Check the fluidDebris in the fluid points to internal wear.
Questions about P0715
Is P0715 a sign of transmission failure?
Not necessarily. Most often the sensor, its wiring or connector is at fault. Internal damage is less likely unless other codes or symptoms appear.
Can the speedometer be affected?
On some cars the speed sensors also feed the speedometer or cruise control, so they may stop working.
Is the sensor inside the transmission?
It depends on the design. Some are reached from outside, others are inside and need the oil pan or valve body removed.
Can low fluid cause sensor codes?
Sometimes. Low fluid can make the gearbox behave abnormally. Check the fluid as part of the diagnosis.
Can I drive in limp mode?
Only short distances. Limp mode usually keeps one gear for safety.