2026-04-06

Gearbox Fluid - Front Drive Unit (Drain and Fill) (Remove and Replace)

Correction code 39300102 FRT 0.48 NOTE: Unless otherwise explicitly stated in the procedure, the correction code and FRT listed above reflect all of the work required to perform this procedure, including the linked procedures. Do not stack correction codes unless explicitly told to do so. NOTE: See Flat Rate Times to learn more about FRTs and how they are created. NOTE: See Personal Protection to make sure you are wearing proper PPE when performing the procedure below. NOTE: See Ergonomic Precautions for safe and healthy working practices.

  • 2026-04-06: Updated entire procedure to latest time study.
  • 2025-01-14: Noted that additional diagnosis may be necessary if over 300 mL of fluid was added.
  • 2025-01-06: Added note to record the amount of fluid added.
  • 2024-12-23: Added note that Cybertruck drive unit gearbox fluid drain procedures are under development.
Warning IconA warning icon, calling your attention to a possibly risky situation
Warning
This procedure is a DRAFT. Although it has been validated, Warnings and Cautions might be missing. Follow safety requirements and use extreme caution when working on or near High Voltage systems and components.

Drain

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Note
Cybertruck drive unit gearbox fluid drain procedures are under development. If low drive unit gearbox fluid is suspected, perform the "Refill" section below to top off the fluid.

Refill

  1. Raise and support the vehicle. See Raise Vehicle - 2 Post Lift.
  2. Open the LH front door and lower the LH front window.
  3. Remove the front aeroshield. See Aeroshield - Front (Remove and Install).
  4. Position a fluid catcher under the Front Drive Unit (FDU).
  5. Remove the oil fill plug from the FDU.
    15 Nm (11.1 lbs-ft)
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 8 mm Allen
    Informational PurposesAn informational icon, calling your attention
    Note
    Verify the O-ring is not damaged. Replace the O-ring as needed.
  6. Remove oil drain plug from FDU and allow the fluid to fully drain.
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 8 mm Allen
  7. Inspect plug O-rings and replace if necessary.
  8. Remotely connect Toolbox 3 to the vehicle.
    1. Click the connection status icon at top right corner.
    2. Click Connect Remotely.
    3. Enter the VIN into the Product ID drop down box, and then select the VIN from the list.
    4. Make sure the correct VIN is populated, and then click Connect.
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    Note
    Once status icon turns green and all check marks are green, click the status icon to close the connection menu.
  9. Navigate to the Actions tab, and then run PROC_DIX_X_OIL-PUMP-DRAIN-CONTROLvia Toolbox:(link).
    Informational PurposesAn informational icon, calling your attention
    Note
    Select RDU. Run action and allow oil to drain.
  10. Install the oil drain plug onto the FDU.
    15 Nm (11.1 lbs-ft)
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 8 mm Allen
  11. Release the clips (x2) that attach the RH acoustic cover to the lower portion of the acoustic cover.
  12. Release the clips (x2) that attach the RH acoustic cover to the FDU, and then remove the cover from the vehicle.
    Informational PurposesAn informational icon, calling your attention
    Note
    Route the cover between the subframe and halfshaft.
  13. Set up the fill kit with KAF1.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    Only use KAF1 fluid. Do not interchange or mix oil types.
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    Note
    Fill the oil container generously to prevent underfill and additional air being injected.
  14. Position the oil pump hose into the fill hole.
  15. Gradually pump fluid into the FDU until fluid spills from the fill port, and then note the amount of fluid added.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    If over 500 mL of gearbox fluid was added to the drive unit, additional diagnosis may be needed.
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    Note
    Note in the Service Visit the amount of fluid added to the drive unit.
  16. Remove the oil pump hose from the FDU fill hole.
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    Note
    Turn off the valve, and then remove the hose from the fill hole.
  17. Spray the area with brake cleaner and wipe any residual fluid.
  18. Position the RH acoustic cover onto the FDU, and then fasten the clips (x2) that attach the cover to the drive unit.
    Informational PurposesAn informational icon, calling your attention
    Note
    Route the cover between subframe and axle.
  19. Fasten the clips (x2) that attach the RH side acoustic cover to the lower portion of the acoustic cover.
  20. Install the oil fill plug onto the FDU.
    15 Nm (11.1 lbs-ft)
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 8 mm Allen
    Informational PurposesAn informational icon, calling your attention
    Note
    Verify the O-ring is not damaged. Replace the O-ring as needed.
  21. Remove the fluid catcher from underneath the vehicle.
  22. Install the front aeroshield. See Aeroshield - Front (Remove and Install).
  23. Remove the vehicle from the lift. See Raise Vehicle - 2 Post Lift.
  24. Connect a laptop with Toolbox to the vehicle. See Toolbox 3 (Connect and Disconnect).
  25. Click the Actions tab, and then search for "Oil Pressure".
  26. Run TEST-SELF_DIF_X_OIL-PUMP-PRESSUREvia Toolbox:(link).
  27. Disconnect Toolbox and remove the laptop from the vehicle. See Toolbox 3 (Connect and Disconnect).
  28. Raise the LH front window and close the LH front door.