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P1700 Transmission Indeterminate Failure (Failed to Neutral)

The OBD2 code P1700 indicates a transmission indeterminate failure, specifically related to the transmission being unable to determine its neutral position

Definition

The OBD2 code P1700 indicates a transmission indeterminate failure, specifically related to the transmission being unable to determine its neutral position

Common causes

  • Faulty transmission control module (TCM)
  • Malfunctioning vehicle speed sensor (VSS)
  • Wiring issues or damaged connectors
  • Low transmission fluid levels
  • Contaminated or degraded transmission fluid
  • Faulty transmission solenoids
  • Internal transmission failure
  • Incorrectly adjusted or malfunctioning throttle position sensor (TPS)
  • Issues with the engine control module (ECM)
  • Faulty neutral safety switch

Common misdiagnoses

  • Faulty Transmission Control Module (TCM)
  • Transmission Fluid Issues
  • Faulty Speed Sensors
  • Wiring or Connector Problems
  • Faulty Transmission Solenoids
  • Engine Control Module (ECM) Issues
  • Mechanical Transmission Problems
  • Incorrectly Installed or Faulty Torque Converter
  • Battery or Charging System Issues
  • Faulty Gear Selector or Shift Linkage

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. Sometimes, multiple codes can provide more context about the issue

  2. 2. Inspect Transmission Fluid

  3. 3. Check the transmission fluid level and condition. Low or dirty fluid can cause transmission issues

  4. 4. If the fluid is dark, burnt, or has a burnt smell, it may need to be changed

  5. 5. Examine Wiring and Connectors

  6. 6. Inspect the wiring harness and connectors related to the transmission control module (TCM) for any signs of damage, corrosion, or loose connections

  7. 7. Pay special attention to the wiring that connects to the transmission itself

  8. 8. Check the Transmission Control Module (TCM)

  9. 9. Ensure that the TCM is functioning properly. If there are issues with the TCM, it may need to be reprogrammed or replaced

  10. 10. Look for any signs of water intrusion or physical damage

  11. 11. Inspect the Transmission Range Sensor (TRS)

  12. 12. The TRS (also known as the neutral safety switch) can cause issues if it is malfunctioning. Test the sensor to ensure it is providing the correct signals to the TCM

  13. 13. Test the Shift Solenoids

  14. 14. The shift solenoids control the flow of transmission fluid and can cause shifting issues if they are faulty. Test the solenoids for proper operation

  15. 15. Check for Mechanical Issues

  16. 16. Inspect the transmission for any mechanical problems, such as worn clutches or bands, which could lead to slipping or failure to engage properly

  17. 17. Perform a Visual Inspection

  18. 18. Look for any obvious signs of leaks, damage, or wear in the transmission and surrounding components

  19. 19. Reset the Codes

  20. 20. After performing any repairs or adjustments, clear the codes and take the vehicle for a test drive to see if the P1700 code returns

  21. 21. Consult Technical Service Bulletins (TSBs)

  22. 22. Check for any TSBs related to the specific make and model of the vehicle, as there may be known issues or recalls that could be relevant. 1

  23. 23. Seek Professional Help

  24. 24. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or transmission specialist for further diagnosis and repair. By following these troubleshooting steps, you can systematically identify and address the underlying issues causing the P1700 code