P0715: Input/Turbine Speed Sensor A Circuit Malfunction
Severity: high
What it means: P0715 means the transmission computer has a problem with the signal from the input (turbine) speed sensor, which reports how fast the transmission's input shaft is turning. Without it, the computer can't shift correctly and may go into limp mode.
Safe to drive? Drive gently and get it checked soon. Shifting may be harsh, and the transmission may go into limp mode.
Common symptoms
- Check engine or wrench light
- Harsh shifts or no upshift
- Limp mode, speedometer problems on some cars
Likely causes, ranked
- Failed input speed sensorDIY or shop
- Damaged wiring or corroded connectorDIY or shop
- Internal transmission problemShop
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Vehicle-specific notes
- 2005–2007 Ford Five Hundred: On PY Online, a 2006 Five Hundred that lost power at cruising speed showed P0701, P0715 and U0001 together. Read the full answer · Source
DIY or shop?
DIY for checking connectors and wiring if the sensor is reachable. Some sensors are inside the transmission and need a shop.
Before you replace parts
- Read all stored codes and freeze-frame data, not just this one.
- Check your VIN for recalls, service bulletins and extended coverage.
- Inspect wiring and connectors for the related sensor or part before buying parts.
- Clear the code only after a repair, then confirm it stays off.
Safety / mechanic note
Verify with a mechanic. A sudden loss of power in traffic is dangerous. A code points to a circuit or system, not always a specific part.
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