OBD codes / P0717
P0717
SeriousInput/Turbine Speed Sensor Circuit No Signal
Expect limp mode with P0717 — the car will move, but stuck in one gear with harsh engagement and screaming RPM at highway speed. That's fine for a gentle trip to the shop, not for commuting or towing. The transmission is protecting itself; let it.
What this code means
P0717 means the computer sees no signal at all from the input (turbine) speed sensor — the shaft is obviously turning, but the sensor circuit reports nothing. Compare that to P0716, where the signal exists but is erratic: a completely dead signal points to a failed sensor, a broken wire, a disconnected connector, or (less often) a damaged tone ring the sensor reads from. The input speed signal is one half of the ratio calculation the transmission depends on, so losing it usually triggers a firm response: limp mode, locked into a single gear, with harsh engagement. Some vehicles also lose torque-converter lockup and show odd tachometer-versus-speed behavior. The upside of a hard failure is that it's easier to diagnose than an intermittent one.
Symptoms you might notice
- Transmission locked in one gear (limp mode)
- Harsh engagement and high RPM at road speed
- No torque-converter lockup
- Check-engine light, often immediately on startup or first shift
What it costs to fix
Typical range: $60–$450 · about ~0.3–1.5 hrs of labor
| If the cause is… | Part | Labor |
|---|---|---|
| Input/turbine speed sensor | $30–$150 | ~0.3–1 hrs |
| Wiring / connector repair | $10–$120 | ~0.5–1.5 hrs |
If the sensor is externally mounted, this is a quick, inexpensive repair. Internal sensors add pan-off labor, and the rare tone-ring failure is a much bigger internal job — but sensor and wiring faults account for the large majority of P0717s.
The price swings on which cause it turns out to be — so confirm the cause before paying. Diagnose P0717 for my exact vehicle →
Frequently asked
Why is my car stuck in one gear?
Without an input speed signal the computer can't verify shifts are completing safely, so it locks the transmission into a single fail-safe gear. It feels alarming, but it's deliberate protection — and it typically resolves as soon as the sensor circuit is repaired.
Is P0717 expensive to fix?
Usually not. The sensor itself is a cheap part, and on many transmissions it's externally mounted and quick to replace. The bill only grows if the sensor is internal (pan-off labor) or, rarely, if the tone ring the sensor reads is damaged.
Should I check the fluid for P0717?
Always — it's free and takes two minutes. Severely degraded fluid can coat a magnetic sensor in metal debris, and low fluid causes its own shifting chaos. If the fluid is dark, burnt-smelling, or glittery, that's important diagnostic information regardless of the sensor.
Can I drive to work with P0717?
Not recommended. Limp mode at highway speed means very high RPM, poor acceleration, and extra heat. Drive gently to a shop and get it diagnosed — the fix is often same-day if the sensor is external.
Seeing P0717 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0717 for my vehicleRelated trouble codes
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Generic OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.