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P0715: Input/Turbine Speed Sensor Circuit Malfunction

What this check-engine code means in plain English, what usually causes it, and what a fix typically costs.

Severity: Monitor — not an emergency, but don't ignore it

What P0715 means

The transmission input speed sensor (also called turbine speed sensor) monitors how fast the input shaft is spinning. When the powertrain control module detects no signal or an erratic signal from this sensor, it sets code P0715 and illuminates the check engine light. This sensor is critical for proper transmission shift timing and torque converter lockup.

What causes P0715?

Likely
Faulty input speed sensorThe sensor itself has failed internally due to heat, vibration, or age and no longer produces a valid signal.
Likely
Damaged wiring or connectorWires to the sensor are broken, corroded, shorted, or the connector has become loose or contaminated with transmission fluid.
Possible
Low transmission fluidInsufficient fluid level can cause erratic sensor readings or prevent the sensor from functioning properly.
Less common
PCM or transmission control module faultThe computer that monitors the sensor has failed or has corrupted software, though this is rare.

Is P0715 safe to drive?

Drive it?
Usually yes, short distances
Watch for
Harsh or erratic shifting, transmission slipping, or going into limp mode
DIY-friendly?
Checking fluid level is easy; sensor replacement requires some mechanical skill and access underneath the vehicle.

You can typically drive short distances, but the transmission may shift poorly, stay in a single gear (limp mode), or experience delayed engagement. Prolonged driving with this code can cause additional transmission wear or leave you stranded if the transmission enters failsafe mode.

P0715 repair cost

~$150 – $400+

Industry-average estimates. Cost depends on sensor location (some require transmission pan removal), labor rates, and whether wiring repair is needed instead of just sensor replacement.

Which one is it for your car?

Plug a cheap OBD2 adapter into your car and CarSense reads your codes and tells you the likely cause and a real cost for your exact vehicle — free to scan, no proprietary dongle.

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