2026-05-13

Ancillary Cover (Standard) (Remove and Install)

Correction code NEW 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.

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.
Warning IconA warning icon, calling your attention to a possibly risky situation
Warning
Cybertruck electronics are powered by a 48V "mid voltage" or "MV" architecture that is designed to improve efficiency. Servicing MV components requires extra knowledge and care in order to avoid personal and/or vehicular harm. Read and understand MV precautions in Electrical Precautions and make sure any required MV-related training courses have been completed, as applicable.
  • 2026-04-27: Released new procedure.
  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. Place the vehicle into Service Mode. See Service Mode.
  4. Unlock the vehicle Gateway. See Gateway (Unlock).
  5. Remove the tonneau slats. See Slat System - Tonneau (Remove and Install).
  6. Remove the bed floor assembly. See Bed Floor Assembly (Long Range) (Remove and Install).
  7. Remove the NVH barrier. See Tonneau NVH Barrier Assembly (Remove and Install).
  8. Disconnect MV power. See Mid-Voltage Power (Disconnect and Connect).
  9. Perform vehicle HV disablement procedure. See Vehicle HV Disablement Procedure (Test/Adjust).
  10. Remove pyro fuse access cover
    Informational PurposesAn informational icon, calling your attention
    Note
    4x bolts, E-Torx 5 lobe, 10 Nm
  11. Remove primary pyro fuse
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, 13mm, 5 Nm + 60 Degrees, Support pyro fuse while removing bolts
  12. Remove secondary pyro fuse
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, 13mm, 5 Nm + 60 Degrees, Support pyro fuse while removing bolts
  13. Lower vehicle until tires are touching the ground
    Informational PurposesAn informational icon, calling your attention
    Note
    Raise lift off locks, then hold lock release lever to keep locks free while vehicle is lowered
  14. Disconnect ancillary bay MV connector
    Informational PurposesAn informational icon, calling your attention
    Note
    1x connector, Double locking, Release tab then pivot lever, Release second tab to disengage connector, Wait 1 second between locking tab release to discharge and prevent arcing
  15. Remove bolt securing busbar HV connector lid
    Informational PurposesAn informational icon, calling your attention
    Note
    1x bolt, EP10, 9 Nm
  16. Remove bolts securing HV connector to DC FC header
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, 10mm, 9 Nm
  17. Release HV connector from DC FC header
    Informational PurposesAn informational icon, calling your attention
    Note
    1x connector, Use inflatable airbag if needed to suspend busbar assembly above ancillary assembly
  18. Support HV Busbar assembly
    Informational PurposesAn informational icon, calling your attention
    Note
    1X Bungee, Suspend assembly to maintain clearance, wrap bungee around busbar assembly to achieve required cord length, Connect bungee to tie down hook on bed side
  19. Remove fast charger header doubler
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, E10 5 Lobe Torx, 10 Nm
  20. Remove mid voltage header bolts
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, EP10, 6 Nm
  21. Release fasteners securing ancillary bay cover to HV battery
    Informational PurposesAn informational icon, calling your attention
    Note
    22x bolts, E10 5-Lobe, 6 Nm, Use E10 5-Lobe socket without magnet, The fasteners are captive and will stay attached to the penthouse cover, Follow fastening order
  22. Remove ancillary bay cover
    Informational PurposesAn informational icon, calling your attention
    Note
    Install vacuum cup to ancillary bay cover surface, Lift and maneuver cover around busbar and tonneau cage to remove
  23. Install ancillary cover
    Informational PurposesAn informational icon, calling your attention
    Note
    Use suction cup and maneuver around busbar and tonneau cage
  24. Secure ancillary cover fasteners to HV battery
    Informational PurposesAn informational icon, calling your attention
    Note
    22x bolts, E10 5-Lobe, 6 Nm, Use E10 5-Lobe socket without magnet, The fasteners are captive and will stay attached to the penthouse cover, Follow fastening order
  25. Install mid voltage header bolts
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, EP10, 6 Nm
  26. Install fast charger header doubler
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, E10 5 Lobe Torx, 10Nm
  27. Clean HV connector contact surface of residual Penetrox
    Informational PurposesAn informational icon, calling your attention
    Note
    Allow 1 minute dry time after removing Penetrox, New busbar comes with Penetrox applied to HV connector
  28. Clean busbar HV connector contact surface of residual Penetrox
    Informational PurposesAn informational icon, calling your attention
    Note
    Allow 1 minute dry time after removing Penetrox, It is necessary to clean HV connector during re-use of busbar
  29. Apply Penetrox onto HV connector joints
    Informational PurposesAn informational icon, calling your attention
    Note
    Apply 2 drops of Penetrox A-13 about 5mm in diameter to either side of the hole on both leads, Spread evenly to verify the contact surface is fully covered
  30. Position busbar connector and lower onto HV header
    Informational PurposesAn informational icon, calling your attention
    Note
    Release bungee cord
  31. Install bolts securing charge port busbar kit to HV Header
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, 10mm, 9 Nm
  32. Perform Hioki resistance test at each HV joint from HV busbar lead to bolt head
    Informational PurposesAn informational icon, calling your attention
    Note
    2x HV joints, When using Hioki tester, verify the meter has been properly adjusted and set prior to usageThe acceptable resistance is between 0.050 mΩ (50 μΩ) and 0.195 mΩ (195 μΩ).If the resistance is greater than 0.195 mΩ (195 μΩ), stop work and escalate the Toolbox session.If the resistance is lower than 0.050 mΩ (50 μΩ), reposition the probes and measure again.If the resistance is repeatedly between 0.00 mΩ and 0.050 mΩ (50 μΩ), hioki test passed, proceed to next step
  33. Install bolt securing busbar HV connector lid
    Informational PurposesAn informational icon, calling your attention
    Note
    1x bolt, EP10, 9 Nm
  34. Remove leather over gloves and HV insulating gloves
  35. Connect ancillary bay MV connector
    Informational PurposesAn informational icon, calling your attention
    Note
    1x connector, double locking, Rotate lever into 2nd lock, Perform a pull test to ensure connector engaged correctly
  36. Raise vehicle fully and lower lift onto locks
    Informational PurposesAn informational icon, calling your attention
    Note
    Set vehicle to comfortable working height, Ensure an audible click of locks on both sides is heard before lowering, Vehicle may tilt to the side if both locks are not engaged
  37. Install secondary pyro fuse
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, 13mm, 5 Nm + 60 degrees, Support pyro fuse while installing bolts, Bolts may be reused
  38. Install primary pyro fuse
    Informational PurposesAn informational icon, calling your attention
    Note
    2x bolts, 13mm, 5 Nm + 60 degrees, Support pyro fuse while installing bolts, Bolts may be reused
  39. Perform Hioki resistance test at each HV joint from HV busbar lead to pyro fuse busbar
    Informational PurposesAn informational icon, calling your attention
    Note
    4x HV joints, When using Hioki tester, verify the meter has been properly adjusted and set prior to usageThe acceptable resistance is between 0.050 mΩ (50 μΩ) and 0.195 mΩ (195 μΩ).If the resistance is greater than 0.195 mΩ (195 μΩ), stop work and escalate the Toolbox session.If the resistance is lower than 0.050 mΩ (50 μΩ), reposition the probes and measure again.If the resistance is repeatedly between 0.00 mΩ and 0.050 mΩ (50 μΩ), hioki test passed, proceed to next step
  40. Install pyro fuse access cover with airlines attached
    Informational PurposesAn informational icon, calling your attention
    Note
    4x bolts, E-Torx 5 lobe, 10 Nm, Ensure seal is fully seated and undamaged, Secure 2 airline mounting clips to HV Battery, If HV pack is being shipped then pyro fuses must be removed
  41. Remove leather over gloves and HV insulating gloves
  42. Install the rear skid plate. See Skid Plate - Rear (Remove and Install).
  43. Lower vehicle until tires are touching the ground
    Informational PurposesAn informational icon, calling your attention
    Note
    Raise lift off locks, then hold lock release lever to keep locks free while vehicle is lowered
  44. Reconnect MV power. See Mid-Voltage Power (Disconnect and Connect).
  45. Install the rear underhood apron. See Underhood Apron - Rear (Remove and Install).
  46. Install the NVH barrier. See Tonneau NVH Barrier Assembly (Remove and Install).
  47. Install the bed floor assembly. See Bed Floor Assembly (Long Range) (Remove and Install).
  48. Install the tonneau slats. See Slat System - Tonneau (Remove and Install).
  49. Remove the vehicle from the lift. See Raise Vehicle - 2 Post Lift.
  50. Exit Service Mode. See Service Mode.
  51. Raise the LH front window and close the LH front door.