The P0718 trouble code indicates an intermittent issue with the Input or Turbine Speed Sensor A Circuit. This sensor measures the rotational speed of the input or turbine shaft inside the transmission and sends this data to the engine control module (ECM) or transmission control module (TCM). An intermittent fault means that the sensor circuit is experiencing sporadic disruptions, causing unreliable data transmission.
P0718 Input/Turbine Speed Sensor A Circuit Intermittent
Code symptoms P0718.
1. Check Engine Light (CEL) illuminated on the dashboard.
2. Erratic shifting behavior, including delayed or harsh shifts.
3. Transmission slipping or overheating.
4. Inaccurate speedometer readings or speedometer failure.
5. Vehicle may go into “limp mode,” restricting speed and gear selection.
6. Loss of fuel efficiency.
7. Transmission may stay in one gear or fail to shift at all.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0718.
1. Loose or corroded electrical connectors in the sensor circuit.
2. Damaged or frayed wiring harness leading to the sensor.
3. Poor electrical connections or intermittent short circuits in the sensor circuit.
4. Faulty input or turbine speed sensor.
5. Vibration or movement causing intermittent disruptions in the sensor circuit.
Code Solutions P0718.
1. Inspect the wiring harness and connectors in the input or turbine speed sensor circuit for any signs of damage, looseness, or corrosion. Repair or replace damaged components and ensure tight connections.
2. Test the input or turbine speed sensor for proper operation using a multimeter or scan tool. Replace the sensor if it is found to be faulty.
3. Monitor the sensor circuit while the vehicle is running to identify any intermittent issues. Wiggle test the wiring harness and connectors to replicate the problem.
4. If other potential causes have been ruled out, consider securing the wiring harness to prevent excessive movement or vibration. This can help minimize intermittent disruptions in the sensor circuit.
5. Clear the trouble codes from the ECM or TCM memory and perform a test drive to see if the issue recurs. If the CEL illuminates again with the same code, further diagnosis may be necessary.
6. If you’re not comfortable performing the diagnostics and repairs yourself, it’s best to seek assistance from a qualified mechanic or dealership. They may need to perform more advanced diagnostics using specialized tools.