P0718Input/Turbine Shaft Speed Sensor A Circuit Intermittent
- 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. P0718 means the signal is present but jumps or drops out briefly. Ford's petrol modules from 2012 to 2023 count 200 turbine speed spikes above 400 rpm with at most 1.5 s between them in a forward gear. GM's Honda-built five-speed of 2006 flags jumps of more than 3 mph per 10 ms three times in 500 ms, after two trips; GM's own transmissions file such jumps under P0716 instead. Loose contacts and electrical interference are the usual causes; shifts become erratic and limp mode may follow at times.
- What you may notice
- Occasional harsh or unexpected shifts
- Warning lamp
- Converter clutch applies and releases unevenly
- Limp mode at times
- Likely causes
- LikelyLoose contact, corroded connector or chafing
- PossibleElectrical interference (shielding, ground, added consumers)
- PossibleMetal debris on the sensor or loose mounting
- PossibleSensor faulty internally (temperature-dependent)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €80 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.