WOMS
P code powertrain High severity

P1733 3-4 Shift Malfunction

The OBD2 code P1733 indicates a malfunction in the 3-4 shift of the transmission, typically related to issues with the shift solenoid, transmission fluid pressure, or internal transmission components

Definition

The OBD2 code P1733 indicates a malfunction in the 3-4 shift of the transmission, typically related to issues with the shift solenoid, transmission fluid pressure, or internal transmission components

Common causes

  • Faulty transmission control module (TCM)
  • Malfunctioning shift solenoid
  • Worn or damaged transmission components
  • Low transmission fluid level or poor fluid condition
  • Electrical issues (wiring or connectors)
  • Faulty vehicle speed sensor (VSS)
  • Incorrectly adjusted or damaged throttle position sensor (TPS)
  • Software issues in the TCM

Common misdiagnoses

  • Transmission fluid issues (low or dirty fluid)
  • Faulty transmission control module (TCM)
  • Wiring or connector problems
  • Faulty speed sensors
  • Internal transmission damage
  • Incorrectly adjusted throttle position sensor (TPS)
  • Engine performance issues (e.g., misfires)
  • Vacuum leaks affecting transmission operation

Troubleshooting steps

  1. 1. Check Transmission Fluid Level and Condition

  2. 2. Ensure that the transmission fluid is at the correct level. Low fluid can cause shifting issues

  3. 3. Inspect the fluid for contamination, burning smell, or dark color. If the fluid is dirty or burnt, consider a transmission fluid change

  4. 4. Inspect for Leaks

  5. 5. Look for any signs of transmission fluid leaks around the transmission pan, seals, and hoses. Leaks can lead to low fluid levels and shifting problems

  6. 6. Scan for Additional Codes

  7. 7. Use an OBD-II scanner to check for any other related trouble codes. Multiple codes can provide more context for the issue

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

  9. 9. Inspect the TCM for any signs of damage or corrosion. Ensure that the connections are secure and free of dirt or moisture

  10. 10. Inspect Wiring and Connectors

  11. 11. Examine the wiring and connectors related to the transmission for any signs of damage, fraying, or corrosion. Repair or replace as necessary

  12. 12. Test the Shift Solenoids

  13. 13. The shift solenoids control the flow of transmission fluid and are critical for proper shifting. Test the solenoids for proper operation and replace any that are faulty

  14. 14. Check for Mechanical Issues

  15. 15. Inspect the transmission for any mechanical issues, such as worn clutches, bands, or other internal components. A transmission rebuild or replacement may be necessary if significant wear is found

  16. 16. Perform a Transmission Fluid Flush

  17. 17. If the fluid is contaminated, consider performing a transmission fluid flush to remove debris and contaminants

  18. 18. Check for Software Updates

  19. 19. Some vehicles may require software updates for the TCM. Check with the manufacturer or a dealership to see if any updates are available

  20. 20. Test Drive the Vehicle

  21. 21. After performing the above checks and repairs, take the vehicle for a test drive to see if the issue persists. Monitor the shifting behavior closely. 1

  22. 22. Consult a Professional

  23. 23. If the problem continues after performing these steps, it may be best to consult a professional mechanic or transmission specialist for further diagnosis and repair. Always remember to follow safety precautions when working on a vehicle, and if you're unsure about any step, it's best to seek professional assistance