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P code powertrain High severity

P0705 Transmission Range Sensor A Circuit malfunction (PRNDL Input)

The OBD2 code P0705 indicates a malfunction in the transmission range sensor (also known as the PRNDL switch), which monitors the position of the gear selector and communicates this information to the engine control...

Definition

The OBD2 code P0705 indicates a malfunction in the transmission range sensor (also known as the PRNDL switch), which monitors the position of the gear selector and communicates this information to the engine control module

Common causes

  • Faulty transmission range sensor (TRS)
  • Poor electrical connections or wiring issues
  • Corroded or damaged connectors
  • Malfunctioning transmission control module (TCM)
  • Low transmission fluid levels
  • Faulty neutral safety switch
  • Internal transmission problems
  • Software issues in the vehicle's computer system

Common misdiagnoses

  • Faulty Transmission Control Module (TCM)
  • Malfunctioning Transmission
  • Defective Neutral Safety Switch
  • Wiring Issues or Short Circuits
  • Faulty Engine Control Module (ECM)
  • Incorrectly Installed or Damaged Transmission Range Sensor
  • Issues with the Gear Selector Mechanism
  • Low Transmission Fluid Levels or Contamination
  • Faulty Brake Light Switch
  • Problems with the Vehicle Speed Sensor (VSS)

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 (also known as the neutral safety switch) and visually inspect it for any signs of damage, corrosion, or loose connections

  3. 3. Ensure that the sensor is properly mounted and aligned

  4. 4. Check Wiring and Connectors

    Inspect the wiring harness and connectors leading to the transmission range sensor for any signs of wear, fraying, or damage

  5. 5. Ensure that all connectors are securely attached and free of corrosion

  6. 6. Test the Transmission Range Sensor

    Use a multimeter to test the resistance and voltage output of the transmission range sensor according to the manufacturer's specifications

  7. 7. Check for continuity in the wiring to ensure there are no breaks or shorts

  8. 8. Inspect the Gear Selector Mechanism

    Ensure that the gear selector lever is properly aligned and functioning. Sometimes, the linkage can become misaligned or damaged, leading to incorrect readings

  9. 9. Check for Fluid Leaks

    Inspect the transmission for any fluid leaks that could affect the operation of the transmission range sensor or the transmission itself

  10. 10. Clear the Codes and Test Drive

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

  11. 11. Consult the Service Manual

    Refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the transmission range sensor and its circuit

  12. 12. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with transmission systems and can perform more advanced diagnostics. By following these troubleshooting steps, you can identify and potentially resolve the issue related to the P0705 code