WOMS
P code powertrain High severity

P0920 Gear Shift Forward Actuator Circuit / Open [forward motion odd gears 1 3 5]

The OBD2 code P0920 indicates a malfunction in the gear shift forward actuator circuit, specifically related to the forward motion of odd gears (1, 3, 5).

Definition

The OBD2 code P0920 indicates a malfunction in the gear shift forward actuator circuit, specifically related to the forward motion of odd gears (1, 3, 5). This typically means there is an open circuit or a fault in the actuator responsible for shifting these gears

Common causes

  • Faulty gear shift actuator
  • Open or shorted wiring in the actuator circuit
  • Poor electrical connections or corroded connectors
  • Malfunctioning transmission control module (TCM)
  • Low transmission fluid levels
  • Faulty transmission range sensor
  • Mechanical issues within the transmission
  • Software issues or glitches in the TCM

Common misdiagnoses

  • Transmission Control Module (TCM) failure
  • Faulty wiring or connectors
  • Defective gear shift actuator
  • Low transmission fluid level
  • Transmission solenoid issues
  • Incorrectly calibrated transmission
  • Faulty neutral safety switch
  • Malfunctioning vehicle speed sensor
  • Engine control module (ECM) issues
  • Mechanical transmission problems

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 about the issue

  2. 2. Inspect Wiring and Connectors

  3. 3. Visually inspect the wiring and connectors associated with the gear shift actuator. Look for signs of damage, corrosion, or loose connections

  4. 4. Pay special attention to the wiring harness for any fraying or breaks

  5. 5. Test the Actuator

  6. 6. If accessible, test the gear shift forward actuator for proper operation. This may involve checking the resistance or voltage at the actuator connector

  7. 7. Consult the vehicle's service manual for specific testing procedures and specifications

  8. 8. Check the Transmission Fluid

  9. 9. Ensure that the transmission fluid is at the correct level and in good condition. Low or dirty fluid can affect shifting performance

  10. 10. If the fluid is dirty, consider performing a transmission fluid change

  11. 11. Inspect the Transmission Control Module (TCM)

  12. 12. Check for any issues with the TCM, which controls the transmission's shifting. This may involve checking for software updates or reprogramming if necessary

  13. 13. Look for Mechanical Issues

  14. 14. Inspect the transmission for any mechanical issues that could affect shifting, such as worn components or internal damage

  15. 15. If the vehicle has been experiencing slipping or harsh shifting, this could indicate a more serious problem

  16. 16. Perform a Visual Inspection of the Gear Shift Mechanism

  17. 17. Check the gear shift linkage and mechanism for any binding or misalignment that could prevent proper shifting

  18. 18. Clear Codes and Test Drive

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

  20. 20. Consult a Professional

  21. 21. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or transmission specialist for further diagnosis. Always refer to the specific service manual for your vehicle for detailed procedures and specifications, as they can vary by make and model