OBD-II Code P0717 — What It Means & How to Fix It

What Does This Error Mean?

P0717 means the input/turbine speed sensor signal is absent when the transmission control module expects to see one. The input speed sensor measures how fast the turbine shaft inside the torque converter is spinning. This tells the TCM the speed of the engine's power entering the transmission. When the signal disappears, the TCM cannot control shifting properly. You may experience harsh shifts, no upshifts, or the transmission going into limp mode.

Affected Models

All vehicles 1996+ with automatic transmission
Common in Ford vehicles
Common in GM cars and trucks
Common in Chrysler and Dodge vehicles
Common in Toyota Camry and 4Runner

Common Causes

Faulty input/turbine speed sensor that has failed or its tone ring is damaged
Damaged or corroded wiring to the speed sensor
Metal shavings or debris on the sensor tip causing interference
Corroded sensor connector inside or outside the transmission
Internal transmission damage causing erratic turbine shaft movement

How to Fix It

Connect a scan tool and check for a live input speed sensor reading. With the engine running and transmission in gear, the input speed should show a value proportional to engine RPM. A reading of zero confirms no signal.

Compare input speed to engine RPM. In a locked torque converter, they should be very close. If input speed reads zero while the car is moving, the sensor has failed.
Locate the input speed sensor on the transmission — usually on the side or top of the transmission case near the bell housing. Check its connector for corrosion or damage.

On some transmissions, the sensor is inside the unit and cannot be serviced externally.
Check the wiring from the sensor back to the TCM (transmission control module). Look for chafed wires, loose connectors, or heat damage near exhaust components.

Transmission wiring runs near hot exhaust and can degrade over time.
Remove the sensor and inspect the tip for metal debris. Metal shavings from normal transmission wear can coat the sensor and block its signal. Clean the tip and reinstall to see if the signal returns.

If you find large metal chunks on the sensor, the transmission may have internal damage and should be inspected by a transmission specialist.
Replace the sensor if cleaning does not resolve the issue. Clear the code and test drive to verify smooth shifting and that the transmission exits limp mode.

After clearing the code, the TCM may take a full drive cycle to re-establish normal adaptive shift control.

When to Call a Professional

Input speed sensor replacement is a moderate DIY job. Sensors typically cost $20 to $80 for the part. The sensor may be accessible without transmission removal on many vehicles. Labor at a shop is $100 to $200 depending on access. If the tone ring is damaged, transmission internal repair may be needed — costs vary widely.

Frequently Asked Questions

What is limp mode and will P0717 cause it?

Limp mode (or failsafe mode) is when the transmission locks into one gear — usually second or third — and stays there. The transmission does this to protect itself when the TCM loses critical sensor data. P0717 frequently triggers limp mode because the TCM cannot control shifting without input speed data.

Can I drive in limp mode?

You can drive short distances at reduced speed. Avoid highways if possible — the transmission will not shift out of its locked gear. Drive directly to a shop for diagnosis.

Is the input speed sensor the same as the output speed sensor?

No, they are different sensors. The input speed sensor measures the speed of the shaft entering the transmission (from the engine). The output speed sensor measures the shaft leaving the transmission (going to the wheels). Both are used by the TCM to calculate gear ratio and control shifting.