Transmission · Powertrain · generic (SAE-defined)
P0717: Input/Turbine Speed Sensor "A" Circuit No Signal
P0717 means the transmission computer is receiving no signal at all from the input or turbine speed sensor while the engine is running and the transmission is in gear.
Standard title per SAE J2012 / ISO 15031-6 · Updated 2026-11-07 · By CarWhere Research
How P0717 sets
When the engine is running and the transmission is in a drive gear, the input shaft should be turning, so the transmission control module (TCM) expects a pulsing signal from the input speed sensor. If no pulses arrive for a set period under those conditions, the TCM sets P0717. Enabling conditions are manufacturer-specific.
Common causes of P0717
Roughly most likely first; the actual cause depends on the vehicle and needs testing to confirm.
- Failed input or turbine speed sensor
- Open circuit or unplugged connector
- Wiring shorted to ground
- Excessive sensor air gap or loose mounting
- Damaged or missing reluctor teeth
- TCM fault
P0717 symptoms
- Check engine light on
- Transmission stuck in a single gear
- Very harsh engagements or shifts
- No torque converter lockup
- Speedometer or tachometer issues on some vehicles
How P0717 is diagnosed
- Record freeze frame and confirm input speed reads zero in live data while driving
- Inspect the sensor connector and harness for disconnection or damage
- Check sensor resistance or supply and ground, depending on sensor type
- Check the signal circuit for opens and shorts back to the TCM
- Remove and inspect the sensor for damage, debris and correct seating
- Inspect the reluctor if the sensor and wiring test good
Typical fixes for P0717
- Replace the input speed sensor
- Reconnect or repair wiring and connectors
- Correct sensor mounting or air gap
- Repair internal reluctor damage
- Replace the TCM if testing confirms it
Replace parts only after testing confirms the cause — a code names the circuit or condition that failed a check, not necessarily the faulty part. We don’t publish per-repair prices; for what households actually spend on upkeep, see car repair costs.
Related codes & warning lights
P0717 FAQ
What does code P0717 mean?
P0717 means the transmission computer is receiving no signal at all from the input or turbine speed sensor while the engine is running and the transmission is in gear. The standard definition is "Input/Turbine Speed Sensor "A" Circuit No Signal."
Can I drive with a P0717 code?
Only far enough to get it repaired. Many transmissions enter limp mode or shift harshly without this signal, and driving that way for long can cause further wear.
Will a new sensor always fix P0717?
Not always. An open wire, unplugged connector or damaged reluctor produces the same no-signal condition, so testing the circuit first avoids replacing a good sensor.
Why is my transmission stuck in one gear?
Without input speed, the computer cannot confirm shifts, so it often defaults to a fixed gear to protect the transmission until the fault is repaired.
Keep researching
More transmission codes
Sources
- SAE J2012 — Diagnostic Trouble Code Definitions (standard code titles)
- ISO 15031-6 — Road vehicles: communication between vehicle and external equipment for emissions-related diagnostics, Part 6: Diagnostic trouble code definitions
- U.S. EPA — Vehicle Emissions Inspection and Maintenance (I/M) programs
- U.S. EPA, 40 CFR 86.1806-17 — Federal onboard diagnostics requirements for light-duty vehicles
General information written by CarWhere Research, not a diagnosis of your vehicle. Manufacturers can add their own sub-definitions and test conditions; confirm with the factory service information for your year, make and model. Before paying for a repair, check NHTSA for open recalls and your warranty booklet: federal law requires an emissions warranty on major emission-control parts such as the catalytic converter and engine computer.