P0717Input/Turbine Shaft Speed Sensor A Circuit No Signal
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The input or turbine shaft speed sensor – a Hall sensor with square-wave output or an inductive sensor with sine output – reports the speed behind the torque converter. With output and engine speed it gives the actual gear ratio, converter slip and shift timing. P0717 means there is practically no input speed signal although the vehicle is driving under power. GM's 2025 modules flag under 200 rpm for more than 4 s with torque applied, the 6T70 under 50 rpm for 5 s, the Allison 1000 under 61 rpm with output above 500 rpm; Ford under 200 rpm for 5–30 s; all after one trip. GM calls it 'circuit low voltage', but means missing frequency. On GM's 10-speed both input and output sensors share a supply – P0717 together with P0722 points to that supply rather than two sensors.
- What you may notice
- Check engine and/or transmission warning lamp
- Limp mode with fixed gear, harsh shifts
- Torque converter clutch does not apply
- Input speed shows 0 or implausible in the scan tool
- Likely causes
- LikelySpeed sensor faulty (Hall IC or coil open or shorted)
- LikelyConnector or harness corroded, chafed or loose pins (with internal sensors also the pass-through connector)
- PossibleMetal debris on the sensor magnet or damaged reluctor wheel
- RareTransmission module or its sensor supply faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.