This procedure covers the removal and installation of the front or rear subframe assembly on the 2025 Rivian EDV 500, including disconnection of suspension, drivetrain, and electrical components.

Warnings

Tools required

Parts

• Subframe mounting bolts × 1 — Use OEM specification
• Subframe alignment pins (if damaged) × 1 — Use OEM specification
• Control arm fasteners (if reused bolts show wear) × 1 — Use OEM specification
• Differential mounting hardware × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect 12V battery negative terminal and wait minimum 5 minutes for system capacitor discharge
3. Raise vehicle on lift to comfortable working height ensuring all four wheels are off the ground
4. Remove all four wheels and set aside safely
5. Document or photograph routing of any electrical connectors and brake lines for reassembly reference
6. Spray all subframe mounting bolts and control arm fasteners with penetrating oil if corrosion is present
7. Place drain pans under differential and motor assemblies in case of residual fluid leakage

Procedure

1. 1

   Disconnect steering components
   Remove the steering rack-to-subframe mounting bolts. Support the steering rack with mechanics wire or a separate support to prevent stress on steering column. Do not allow rack to hang by hydraulic lines or electrical connections. Mark the position of any adjustable components for reassembly alignment.
2. 2

   Disconnect brake lines and ABS sensors
   Disconnect brake caliper mounting if attached to subframe-mounted knuckles. Remove any brake line brackets attached to the subframe. Disconnect wheel speed sensor connectors and unclip wiring from subframe routing channels. Cap or plug any open brake line fittings to prevent contamination.
3. 3

   Remove control arms and suspension links
   Disconnect lower control arms, tension links, and stabilizer bar end links from their subframe mounting points. Use a ball joint separator if necessary for any ball joint connections. Support the suspension knuckle assemblies to prevent damage to CV axles or brake components. Keep all fasteners organized by location for proper reassembly.
4. 4

   Disconnect drive unit electrical connections
   Locate and disconnect all electrical connectors from the electric motor drive unit mounted to the subframe. This includes motor phase connectors, resolver/encoder connectors, and coolant temperature sensors. Use proper high-voltage disconnect procedures if accessing HV connections (consult manufacturer service manual). Secure connectors away from work area.
5. 5

   Disconnect drivetrain half shafts
   Remove the half shaft retaining bolts at the differential or motor output flanges. Mark the relationship between half shaft and flange for reinstallation in the same orientation. Support half shafts with mechanics wire to prevent over-extension of CV joints. Do not allow half shafts to hang freely.
6. 6

   Disconnect coolant lines from motor
   Place drain pans under motor coolant connections. Disconnect coolant supply and return lines from the electric motor cooling jacket. Expect residual EV Battery/Motor Coolant to drain (minimal amount). Cap or plug all open coolant fittings immediately to prevent contamination and spillage.
7. 7

   Support subframe with transmission jack
   Position a transmission jack or specialized subframe support fixture under the center of the subframe. Adjust height so the fixture makes firm contact with subframe but does not yet bear full load. Ensure support is stable and positioned at subframe load-bearing points, not on control arm mounts or differential housing.
8. 8

   Remove subframe mounting bolts
   Locate all subframe-to-chassis mounting bolts (typically 4-6 main mounting points). Using a calibrated breaker bar or impact wrench, remove mounting bolts in a cross-pattern sequence starting from rear and working forward. Have an assistant monitor subframe stability as bolts are removed. Note any shims or alignment spacers present at mounting points and retain for reinstallation.
9. 9

   Lower subframe assembly
   Slowly and carefully lower the transmission jack, guiding the subframe away from the vehicle body. Watch for any remaining connections, wiring, or hoses that may still be attached. Lower subframe completely and roll away from under vehicle. Inspect subframe mounting points on chassis for damage, corrosion, or worn bushings.
10. 10

    Inspect and prepare for installation
    Inspect removed subframe for cracks, worn bushings, and damaged mounting points. Clean all mounting surfaces on both subframe and vehicle chassis using a wire brush. Remove any corrosion or old thread-locking compound from bolt holes. Apply anti-seize compound to bolt threads unless manufacturer specifies dry torque. Install new bushings or hardware as needed.

Reassembly

1. Position new or serviced subframe on transmission jack and align with chassis mounting points using alignment pins
2. Install subframe mounting bolts hand-tight first, ensuring proper thread engagement and shim/spacer placement
3. Torque subframe mounting bolts to manufacturer specification in a cross-pattern sequence (consult Rivian service manual for exact values as not provided in database)
4. Reconnect half shafts to differential/motor output flanges in original orientation, torque fasteners per specification
5. Reconnect coolant lines to motor cooling jacket, ensure proper seating and clamp tightness
6. Reconnect all electrical connectors to drive unit, ensuring positive locking engagement and proper sealing
7. Reinstall control arms, suspension links, and stabilizer bar connections to subframe mounting points, torque to specification
8. Reinstall steering rack to subframe mounting location, verify alignment marks match original position
9. Reconnect brake line brackets and wheel speed sensor wiring to subframe routing channels
10. Reinstall wheels and torque lug nuts to specification
11. Lower vehicle to ground
12. Reconnect 12V battery negative terminal
13. Check all fluid levels including EV transmission fluid, coolant, and brake fluid, top off as necessary

Verification

• Start vehicle and verify no warning lights related to drivetrain, ABS, or steering systems
• Perform a visual inspection underneath vehicle for any fluid leaks from coolant connections or differential seals
• Test drive vehicle at low speed in a safe area, verify normal steering operation and absence of unusual noises
• Check for proper operation of ABS and traction control systems during test drive
• Perform wheel alignment using computerized alignment equipment to ensure suspension geometry is within specification
• Use scan tool to check for any stored fault codes related to drive unit, steering, or suspension sensors
• Verify proper torque on all subframe mounting bolts and control arm fasteners after initial test drive (re-check torque after 50 miles if possible)

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