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P code powertrain High severity

P0708 Transmission Range Sensor A Circuit High Input

The OBD2 code P0708 indicates that the transmission range sensor A circuit is sending a high voltage signal, which may suggest a malfunction in the sensor or its wiring, affecting the transmission's ability to determine...

Definition

The OBD2 code P0708 indicates that the transmission range sensor A circuit is sending a high voltage signal, which may suggest a malfunction in the sensor or its wiring, affecting the transmission's ability to determine the correct gear position

Common causes

  • Faulty transmission range sensor
  • Wiring issues (shorts or open circuits)
  • Poor electrical connections
  • Faulty engine control module (ECM)
  • Corroded connectors
  • Low transmission fluid levels
  • Malfunctioning transmission control module (TCM)

Common misdiagnoses

  • Faulty Transmission Control Module (TCM)
  • Malfunctioning Transmission
  • Defective Engine Control Module (ECM)
  • Wiring issues or shorts in the harness
  • Bad connectors or terminals
  • Incorrectly installed or faulty range sensor
  • Low transmission fluid levels
  • Faulty neutral safety switch

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 present

  2. 2. Inspect the Transmission Range Sensor

    Locate the transmission range sensor and visually inspect it for any signs of damage, corrosion, or loose connections

  3. 3. Ensure that the sensor is properly mounted and that the wiring harness is securely connected

  4. 4. Test the Wiring and Connectors

    Check the wiring harness for any frayed wires, shorts, or open circuits

  5. 5. Use a multimeter to test the voltage and ground at the sensor connector. Compare the readings to the specifications in the vehicle’s service manual

  6. 6. Check the Sensor Functionality

    If possible, test the transmission range sensor using a multimeter or scan tool to ensure it is functioning correctly. You may need to refer to the vehicle’s service manual for specific testing procedures and expected values

  7. 7. Inspect the Transmission Fluid Level and Condition

    Low or dirty transmission fluid can affect the operation of the transmission range sensor. Check the fluid level and condition, and change it if necessary

  8. 8. Check for Mechanical Issues

    Inspect the transmission for any mechanical issues that could affect the operation of the range sensor, such as linkage problems or internal transmission faults

  9. 9. Clear the Codes and Test Drive

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

  10. 10. Replace the Transmission Range Sensor

    If all other components check out and the code persists, consider replacing the transmission range sensor, as it may be faulty

  11. 11. Consult a Professional

    If you are unable to diagnose or resolve the issue, it may be best to consult a professional mechanic or technician who has experience with transmission systems.Additional Notes: - Always refer to the specific service manual for your vehicle for detailed procedures and specifications. - Safety precautions should be taken when working on vehicles, including disconnecting the battery when working on electrical components. By following these steps, you should be able to identify and resolve the issue related to the P0708 code