Input/Turbine Speed Sensor Circuit No Signal

The input speed sensor on Nissan CVTs (JF011E/RE0F10A) loses signal due to metal debris on the sensor tip or wiring harness damage from heat. Remove the sensor from the bell housing, clean debris from the magnetic tip, and inspect the connector for corroded pins. If cleaning doesn't fix it, replace the sensor (Nissan). Also check CVT fluid level -- low fluid causes erratic sensor readings. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.

No-signal condition on GM typically means the input speed sensor (ISS) has an open circuit. Located on the left side of the transmission, accessible from under the vehicle. Check the 2-pin connector for pushed-back pins first -- a common issue on trucks that do a lot of towing. Replace with an OE-quality AC Delco unit if the connector is good but no signal is present. Clear codes and road test through all gears. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.

The 545RFE input speed sensor sits on the driver side of the transmission case near the bell housing. Signal loss is usually caused by a cracked sensor body or damaged wiring where the harness runs near the exhaust. Inspect for melted insulation first. Replace with an OE-quality Mopar unit. After replacement, perform a quick-learn procedure with a scan tool to reset adaptive shift pressures. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.

Honda automatics use a mainshaft speed sensor (countershaft speed sensor) for input speed. No-signal faults are often caused by internal transmission wiring harness deterioration -- the connector inside the case develops cracks. If the external sensor tests good (resistance 400-600 ohms), the internal harness likely needs replacement. This requires dropping the valve body. Check Honda has a service bulletin covering this for applicable models. Your dealer can confirm whether an open service bulletin or warranty extension applies to your VIN.