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P0715 Input/Turbine Speed Sensor A Circuit Malfunction

The OBD2 code P0715 indicates a malfunction in the input or turbine speed sensor A circuit, which measures the rotational speed of the transmission's input shaft

Definition

The OBD2 code P0715 indicates a malfunction in the input or turbine speed sensor A circuit, which measures the rotational speed of the transmission's input shaft

Common causes

  • Faulty input/turbine speed sensor
  • Damaged wiring or connectors
  • Poor electrical connections
  • Transmission fluid issues (low level or contamination)
  • Faulty transmission control module (TCM)
  • Malfunctioning transmission
  • Corroded terminals or connectors

Common misdiagnoses

  • Faulty transmission control module (TCM)
  • Incorrectly diagnosed transmission failure
  • Faulty vehicle speed sensor (VSS)
  • Wiring issues or shorts in the harness
  • Faulty engine control module (ECM)
  • Misdiagnosed torque converter issues
  • Incorrectly diagnosed fluid level or quality issues
  • Faulty or dirty transmission fluid temperature sensor

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues affecting the transmission

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the Input/Turbine Speed Sensor. Look for

  3. 3. Damaged, frayed, or corroded wires

  4. 4. Loose or disconnected connectors

  5. 5. Signs of moisture or dirt in the connectors

  6. 6. Test the Input/Turbine Speed Sensor

    Use a multimeter to test the resistance of the sensor. Compare the readings to the specifications in the vehicle's service manual

  7. 7. If the sensor is faulty, replace it

  8. 8. Check the Sensor's Signal

    With the vehicle running, use a scan tool to monitor the Input/Turbine Speed Sensor's data. Ensure that the sensor is providing a valid signal to the ECM

  9. 9. If the signal is erratic or absent, further investigation into the wiring or the ECM may be necessary

  10. 10. Inspect the Transmission Fluid

    Check the transmission fluid level and condition. Low or dirty fluid can affect sensor performance and transmission operation

  11. 11. If the fluid is low, top it off and check for leaks. If it’s dirty, consider a transmission fluid change

  12. 12. Check for Mechanical Issues

    Inspect the transmission for any mechanical issues that could affect the Input/Turbine Speed Sensor's operation, such as a failing torque converter or internal transmission problems

  13. 13. Test the ECM

    If all other components are functioning correctly, the issue may lie with the ECM itself. Testing or reprogramming the ECM may be necessary, but this should be a last resort after all other possibilities have been ruled out

  14. 14. Clear Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  15. 15. Consult a Professional

    If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or technician who has experience with transmission issues and OBD-II diagnostics. By following these steps, you can systematically diagnose and address the cause of the P0715 code