Input/Turbine Speed Sensor Circuit No Signal
What does P0717 mean?
The P0717 code means the vehicle's onboard diagnostic system has detected: Input/Turbine Speed Sensor Circuit No Signal. This is a critical severity code.
Common Symptoms
- Check Engine Light illuminated
- Transmission stuck in limp mode
- No speedometer reading
- Vehicle may not shift from first gear
Probable Causes (Ranked by Likelihood)
- Failed input speed sensor Very High
- Broken input speed sensor wiring High
- Damaged sensor reluctor ring Moderate
- TCM input circuit completely failed Low
Step-by-Step Diagnostic Procedure
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Check for input speed sensor signal on a scan tool -- a reading of 0 RPM with engine running in gear confirms no signal
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Inspect the input speed sensor connector for disconnection
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Measure sensor output with an oscilloscope or AC voltmeter while rotating the input shaft
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Check wiring continuity from sensor to TCM
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Remove the sensor and inspect the reluctor ring through the sensor hole for damage
Frequently Asked Questions
Can I drive with code P0717?
Do not drive. Input/Turbine Speed Sensor Circuit No Signal can cause unsafe or unpredictable transmission behavior.
What causes P0717?
The most common cause is a faulty sensor or wiring issue. Failed input speed sensor is the most likely cause.
Is P0717 expensive to fix?
Typical repair costs range from $100 - $400 (parts and labor). Sensor replacement is the most common fix.