P0717 code: Input/Turbine Speed Sensor Circuit No Signal
P0717 means input/Turbine Speed Sensor Circuit No Signal. The code says where to look, not what failed — the fix depends on which cause your car actually has.
What P0717 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.
P0717 symptoms
- 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 P0717
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 →
How to fix P0717
Moderate — doable at home with common tools and patience
- Rule out low fluid before limping it anywhere
A dead input signal usually forces limp mode, and driving in one gear on low fluid compounds the damage. Check the level using the correct procedure for your unit before moving the car further. If the fluid is loaded with debris, note it — a part breaking up inside can also chew the toothed drum the sensor reads, which changes the whole repair.
- Look for an unplugged or damaged connector
Total signal loss after recent work usually means a connector left off, a harness pulled tight, or a terminal pushed out of its cavity. Locate the input sensor — often on the side or top of the case, sometimes under a heat shield — and check that the plug is latched, the terminals grip, and the wires aren't broken where they leave the sensor body.
- Test the sensor at its connector
On a two-wire magnetic sensor, an open reading across the pins means a broken coil and condemns the part. On a three-wire Hall-type sensor, check for the module's reference voltage — commonly 5 volts or battery voltage depending on design — and a good ground at the harness side before blaming the sensor.
- Ohm the wires back to the module
If the sensor tests good, disconnect the module and check each signal wire end to end for continuity, then check between the two wires and from each one to ground. A break hidden inside the insulation near a clip, or two wires shorted together, kills the signal just as surely as a dead sensor does.
- Replace the sensor and confirm input speed tracks the engine
With a new sensor fitted, idle in Park and check that input speed roughly matches engine speed, then drive and watch it change through the shifts. If a known-good sensor and wiring still produce nothing, the reluctor or input drum may be damaged, and that needs the transmission opened. Clear adaptive values afterwards where the manual calls for it.
DIY or shop? Unlike an intermittent signal, a dead one is usually easy to track down: the connector, the sensor's own resistance or reference, and the wire run to the module can all be checked with a basic meter. Swapping an external input sensor is often one bolt. Where the sensor sits inside the case or behind the valve body, the job becomes a pan-and-valve-body removal that most owners should leave to a transmission shop, and the same goes for a damaged tone wheel.
Tools for the DIY steps: Scan tool with transmission speed data · Digital multimeter · Back-probe pins · Wiring diagram · Socket set and extensions
Not sure which step applies to your car? Get the likely cause for your exact vehicle before buying anything for P0717.
Start a case with P0717 and your car. Redline weighs these causes against what your car shows, and names the check that would settle it before you buy parts.
Can I drive with P0717?
Redline can’t determine from a symptom or code alone whether your car is safe to drive.
P0717: common questions
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. Get it inspected promptly, and have it towed if it's stuck in one gear or struggling to accelerate — the fix is often same-day if the sensor is external.
Related trouble codes
Don’t have a scanner yet? A ~$25 Bluetooth adapter reads codes like P0717 from your phone. See our guide to the best OBD2 Bluetooth adapters. Run a repair shop? See Redline for shops.
Generic OBD-II reference. Manufacturer-specific behavior varies. Confirm with a scan tool and, for safety-related codes, a professional inspection. Cost ranges are reference ranges, not quotes.
Seeing P0717 on your car?
Every problem becomes a Case. Tell Redline what the car is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.