Honda P0717 indicates a transmission input/turbine speed sensor "A" circuit no signal. This critical fault requires immediate attention to prevent transmission damage. Key symptoms include:
Primary Warning Signs
- Check Engine Light Activation: Persistent illumination with stored P0717 code.
- Harsh/Erratic Shifting: Abrupt gear changes, delayed engagement, or failure to shift.
- Torque Converter Clutch (TCC) Malfunction: Unlocked converter causing RPM surges at highway speeds.
- Limp Mode Activation: Transmission defaults to 2nd or 3rd gear with loss of overdrive.
- Speedometer Fluctuations: Needle drops to zero or behaves erratically while driving.
Verification Protocol
Confirm P0717 via OBD-II scanner:
- Check live data for zero RPM reading from input speed sensor during idle or driving
- Compare input and output shaft speed sensor readings - mismatched values confirm circuit failure
- Inspect sensor wiring for damage/corrosion near transmission housing
Critical: Continuing operation with P0717 may cause torque converter slippage and catastrophic transmission failure. Sensor replacement typically resolves the issue unless wiring damage extends to the transmission control module.
