2026-06-04

Rear Drive Unit - 3DU - High Current (Remove and Replace)

Correction code 4001020602 4.20 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.

  • 2026-06-04: Updated steps for LV maintainer connection.

Remove

  1. While performing the courtesy inspection, note any abnormal tire wear that could indicate the need for an alignment.
  2. Move the vehicle to a 2 post lift. See Raise Vehicle - 2-Post Lift.
  3. Enter Service Mode Plus. See Service Mode Plus.
  4. Select High Voltage > Procedures > Rear Drive Unit Replacement.
  5. Click Start Coolant Fill /Drain to run the routine.
  6. Click Release / Re-Engage Emergency Parking Brake, choose Both from the EPB Selection drop-down menu and choose Start from the Action Selection drop-down menu, and then click Run to perform the routine.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    Keep pressing the braking pedal during routine running, as the vehicle can slide freely.
    Informational PurposesAn informational icon, calling your attention
    Note
    You can choose one side as needed.
  7. Position subframe lifting tool and remove subframe and rear drive unit assembly away from vehicle. See Rear Subframe (Remove and Replace).

Install

  1. Position new RDU and crate underneath gantry.
  2. Release protective covers from new RDU and transfer them onto the old drive unit.
  3. Secure drive unit sling onto the new RDU.
  4. Raise the gantry hook to put tension on the sling.
  5. Remove the bolts securing the RDU to the RDU crate.
  6. Lift the new RDU out of the shipping crate.
  7. Lower sling to install drive unit into subframe.
  8. Carefully lower the rear drive unit into the rear subframe. As the rear drive unit is lowered, maneuver the half shafts into the drive unit for later installation.
  9. Install the subframe and rear drive unit assembly away to vehicle. See Rear Subframe (Remove and Replace).
  10. Reconnect the laptop with Toolbox to the vehicle. See Toolbox (Connect and Disconnect).
  11. Install a LV maintainer. See LV Maintainer (Connect and Disconnect) (Maintenance).
  12. On the touchscreen, tap the Service Mode "wrench" (at the bottom of the touchscreen UI), and then tap High Voltage > Procedures > Rear Drive Unit Replacement > Stop coolant Fill/Drain > Run, and allow the routine to complete.
  13. Tap Write Drive Type > Run, and allow the routine to complete.
  14. Tap CAN Redeploy > Run, and allow the routine to complete.
  15. Once the reinstallation is complete, check that the release notes appear on the touchscreen, indicating a successful reinstallation.
  16. Click Release / Re-Engage Emergency Parking Brake, choose Both from the EPB Selection drop-down menu and choose Stop from the Action Selection drop-down menu, and then click Run to perform the routine.
    Informational PurposesAn informational icon, calling your attention
    Note
    You can choose one side as needed.
  17. Tap Coolant Air Purge > Run, and allow the routine to complete.
  18. Tap Thermal system Test > Run, and allow the routine to complete.
  19. Disconnect the LV maintainer. See LV Maintainer (Connect and Disconnect) (Maintenance).
  20. Inspect the coolant level, top off as necessary, and then install the coolant bottle cap.
    Informational PurposesAn informational icon, calling your attention
    Note
    Ensure that the coolant level is at the "Max" line.
  21. Exit Service Mode. See Service Mode.
  22. Install the HEPA filter assembly See HEPA Filter Assembly (Remove and Replace).
  23. Install the rear underhood apron. See Underhood Apron - Rear (Remove and Replace).
  24. Close the hood.
  25. Move both front seats to original position.
  26. Raise all windows and close all doors.
  27. Remove the lift arms from below the vehicle.
  28. Refer to the Alignment Requirement tables to determine whether an EPAS alignment check (EC) or four wheel alignment check (AC) is necessary. If performed, add the alignment check/adjust as a separate activity. See Alignment Requirement - Suspension.