Input/Turbine Speed Sensor Circuit No Signal
What does this mean?
Code P0717 indicates a problem with the transmission input/turbine speed sensor.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Audi Q8 models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
Common Causes
Faulty input/turbine speed sensor
Low, dirty, or burnt transmission fluid
Damaged, chafed, or broken wiring harness
Symptoms to Watch For
- Check Engine Light is illuminated
- Transmission slipping between gears
- Hard or harsh gear shifting
- Transmission stuck in one gear
How to Diagnose
Common Solutions
**Replace the Input/Turbine Speed Sensor:** This is the most frequent solution if the sensor itself is found to be faulty (e.g., open circuit, incorrect resistance, or no signal output during live data monitoring). Ensure the replacement sensor is an OEM equivalent or a high-quality aftermarket part.
**Repair or Replace Damaged Wiring/Connector:** If the wiring harness leading to the sensor or the sensor connector itself is found to be corroded, chafed, or broken, the damaged section must be professionally repaired or the entire sub-harness replaced. Use proper soldering techniques and heat-shrink tubing for durable, weather-resistant repairs.
**Clean Corroded Electrical Connections:** If corrosion is identified at the sensor connector or the TCM/PCM connector, carefully clean the affected pins using a specialized electrical contact cleaner and a small brush. After cleaning, apply a thin layer of dielectric grease to the connections to prevent future corrosion and ensure optimal electrical conductivity.