2026-05-11
Header - DC Input - Busbar - Ancillary (Standard) (Remove and Replace)
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
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
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.
- 2026-05-08: Released new procedure.
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Raise and support vehicle
NoteIf vehicle has air suspension set to Jack Mode", Align lift adapter pins with lift point holes on body, Ensure vehicle is not charging, Remove charging cable if it's plugged in
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Open powered front trunk
NoteVia exterior switch or UI
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Open tailgate
NotePress button to release, Use manual release as necessary
- Remove the tonneau slats. See Slat System - Tonneau (Remove and Install).
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Power off vehicle from center display
NoteVerify EPBs are engaged, Select charge port icon to ensure drive state is disengaged then power down vehicle via Controls > Safety > Power Off
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Remove rear underhood apron
Note9x clips
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Disconnect first responder loop and MV battery connector
Note2x connectors, Release locking tab then disconnect FRL connector, Slide eCPA to left then lift lever to release MV battery connector, Early production trucks may have black FRL connector, Release eCPA by pushing down to unlock and slide red locking tab, Wait 2 minutes for electrical circuits to discharge before disconnecting modules
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Verify operation of multimeter
NoteSet multimeter to DC voltage, Confirm multimeter is properly measuring voltage by testing MV battery, Touch lightly and do not damage terminals
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Raise vehicle fully and lower lift onto locks
NoteSet 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
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Remove mid-aero shield
Note6x clips, 3x bolts, 15mm, 42 Nm, 5x bolts, 13mm, 28 Nm, 2x bolts, 10mm, 6 Nm(*15mm & 10mm bolts not shown in catalog, feedback sent)
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Remove all items from pockets and ensure not wearing metal items
NoteThis includes phones, badges, metal belt buckles airpods and headphones
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Inspect HV insulating gloves
NoteCheck gloves for damage prior to use, Refer to service document TN-15-92-003, for information on inspecting HV gloves.
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Put on HV insulating gloves and leather over gloves
NoteUse HV cut resistant insulated gloves or HV insulating gloves and leather over gloves, HV Insulating gloves must be worn any time a Hioki Tester or Hi-Pot Tester is used, Refer to service document TN-15-92-003 R5 for PPE requirements depending on vehicle configuration
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Verify no HV - Install amp clamp to RDU HV harness
NoteVerify meter is zeroed out before performing measurement, Measure single cable. Verify ammeter is installed in correct direction. If current > 0.5A do not proceed with disconnecting HV connector. In this case, start vehicle electrical isolation again to make sure that all was properly shut down. Escalate for assistance as requiredIf current < 0.5A, Ok to disconnect and check voltage at HV plug on the battery side.Release locking tab and rotate the release lever up to disengage the connector, Release harness clip, Do not force the release lever up, Ensure the alignment tabs on the RDU header are not damagedMake sure to wear PPE (HV gloves, safety glasses) when working on high voltage component, Measure B+ to Ground, B- to Ground, B+ to B-, If voltage is greater than 10V, Pack contactors are not open or welded, Stop work and reach out to Service Engineering
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Secure RDU header connector to ancillary
Note1x connector, Verify lever is in the upright and open position, Carefully seat connector and allow lever to engage, Fully secure lever and verify red tab is locked, Do not damage any pins
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Remove pyro fuse access cover
Note4x bolts, E-Torx 5 lobe, 10 Nm
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Remove primary pyro fuse
Note2x bolts, 13mm, 5 Nm + 60 Degrees, Support pyro fuse while removing bolts
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Remove secondary pyro fuse
Note2x bolts, 13mm, 5 Nm + 60 Degrees, Support pyro fuse while removing bolts
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Install pyro fuse access cover
Note4x bolts, E-Torx 5 lobe, 10 Nm, Ensure seal is fully seated and undamaged, If HV pack is being shipped then pyro fuses must be removed
- Remove leather over gloves and HV insulating gloves
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Lower vehicle until tires are touching the ground
NoteRaise lift off locks, then hold lock release lever to keep locks free while vehicle is lowered
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Remove fastener covers from bed floor assembly
Note14x covers
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Remove bed floor assembly
Note12x short bolts, 15mm, 56 Nm, 2x long bolts, 15mm, 46Nm, Lift front edge with trim tool then remove panel, Recommend assistance
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Disconnect ancillary bay MV connector
Note1x 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
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Put on HV insulating gloves and leather over gloves
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Remove bolt securing busbar HV connector lid
Note1x bolt, EP10, 9 Nm
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Remove bolts securing HV connector to DC FC header
Note2x bolts, 10mm, 9 Nm
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Release HV connector from DC FC header
Note1x connector, Use inflatable airbag if needed to suspend busbar assembly above ancillary assembly
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Support HV Busbar assembly
Note1X 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
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Remove fast charger header doubler
Note2x bolts, E10 5 Lobe Torx, 10 Nm
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Remove mid voltage header bolts
Note2x bolts, EP10, 6 Nm
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Release fasteners securing ancillary bay cover to HV battery
Note22x 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
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Remove ancillary bay cover
NoteInstall vacuum cup to ancillary bay cover surface, Lift and maneuver cover around busbar and tonneau cage to remove
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Remove DC header
Note1x connector, 1x tree clip, connector is hidden under the seal, lift up the seal to see, Slide header off DC bus links, Inspect seal, Replace header if damaged
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Install DC header
Note1x connector, 1x tree clip, Slide header on to DC bus links, connector is hidden under the seal, Inspect seal, Replace header if damaged
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Install ancillary cover
NoteUse suction cup and maneuver around busbar and tonneau cage
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Secure ancillary cover fasteners to HV battery
Note22x 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
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Install mid voltage header bolts
Note2x bolts, EP10, 6 Nm
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Install fast charger header doubler
Note2x bolts, E10 5 Lobe Torx, 10Nm
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Clean HV connector contact surface of residual Penetrox
NoteAllow 1 minute dry time after removing Penetrox, New busbar comes with Penetrox applied to HV connector
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Clean busbar HV connector contact surface of residual Penetrox
NoteAllow 1 minute dry time after removing Penetrox, It is necessary to clean HV connector during re-use of busbar
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Apply Penetrox onto HV connector joints
NoteApply 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
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Position busbar connector and lower onto HV header
NoteRelease bungee cord
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Install bolts securing charge port busbar kit to HV Header
Note2x bolts, 10mm, 9 Nm
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Perform Hioki resistance test at each HV joint from HV busbar lead to bolt head
Note2x 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
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Install bolt securing busbar HV connector lid
Note1x bolt, EP10, 9 Nm
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Connect ancillary bay MV connector
Note1x connector, double locking, Rotate lever into 2nd lock, Perform a pull test to ensure connector engaged correctly
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Raise vehicle fully and lower lift onto locks
NoteSet 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
-
Remove pyro fuse access cover
Note4x bolts, E-Torx 5 lobe, 10 Nm
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Clean pyro fuse mating surfaces
NoteUsing an insulated tool wipe all four busbar mating surfaces within pyro fuse bay, Wipe top and bottom mating surfaces of each pyro fuse, Ensure no debris is present on any mating surface, Process shown with device cluster removed for clarity and safety, HV gloves and associated PPE must be worn at all times when cleaning mating surfaces, Allow 1 minute for IPA to dry
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Install secondary pyro fuse
Note2x bolts, 13mm, 5 Nm + 60 degrees, Support pyro fuse while installing bolts, Bolts may be reused
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Install primary pyro fuse
Note2x bolts, 13mm, 5 Nm + 60 degrees, Support pyro fuse while installing bolts, Bolts may be reused
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Perform Hioki resistance test at each HV joint from HV busbar lead to pyro fuse busbar
Note4x 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
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Install pyro fuse access cover
Note4x bolts, E-Torx 5 lobe, 10 Nm, Ensure seal is fully seated and undamaged, If HV pack is being shipped then pyro fuses must be removed
- Remove leather over gloves and HV insulating gloves
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Install rear skid plate
Note6x clips, 3x bolts, 15mm, 42 Nm, 5x bolts, 13mm, 28 Nm, 2x bolts, 10mm, 6 Nm, Apply Loctite 222 to mid aero shield bolts and install fasteners
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Lower vehicle fully
NoteRaise lift off locks, then hold lock release lever to keep locks free while vehicle is lowered
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Connect first responder loop and MV battery connector
Note2x connectors, Connect FRL connector then secure locking tab, Position lever to secure MV battery connector then slide eCPA to right, Early production trucks may have black FRL connector, If power cycling vehicle then ensure at least 60 seconds has passed since powering down
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Install rear underhood apron
Note9x clips, Adjust windshield seal as required
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Close powered front trunk
NoteVia frunk switch or UI
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Install bed floor assembly
Note12x short bolts, 15mm, 56 Nm, 2x long bolts, 15mm, 46Nm, Recommend assistance
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Install fastener covers onto bed floor assembly
Note14x covers
- Install the tonneau slats. See Slat System - Tonneau (Remove and Install).
- Close tailgate
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Remove vehicle from lift
NoteLower rack arms fully and remove them from under vehicle, Remove air suspension from "Jack Mode"