Electric Drive Motor R&R

This procedure covers the removal and replacement of an electric drive motor on a 2025 Rivian EDV 500 with dual motor AWD configuration, including disconnection of high-voltage systems, coolant lines, and drivetrain components.

Warnings

Tools required

Parts

• Drive motor assembly (front or rear as applicable) × 1 — Use OEM specification
• Motor mounting hardware kit × 1 — Use OEM specification
• High-voltage connector seals × 2 — Use OEM specification
• Coolant hose O-rings × 4 — Use OEM specification
• Motor coolant temperature sensor × 1 — Use OEM specification
• Drive axle seals (if applicable) × 2 — Use OEM specification

Fluids

• EV Battery/Motor Coolant — 10 qt
• EV Transmission Fluid — 10 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Chock rear wheels if replacing front motor, or front wheels if replacing rear motor
3. Disconnect 12V battery negative terminal and wait 2 minutes for system shutdown
4. Access high-voltage service disconnect under rear cargo area and remove HV safety plug
5. Install lockout/tagout device on HV disconnect point
6. Wait minimum 15 minutes for high-voltage capacitor discharge
7. Raise vehicle on lift to comfortable working height
8. Remove appropriate wheels (front or rear depending on motor location)
9. Remove underbody aerodynamic panels and motor splash shields
10. Place coolant drain pan under motor assembly
11. Connect diagnostic tool and document any stored fault codes

Procedure

1. 1

   Verify high-voltage system de-energization
   Using a high-voltage rated multimeter, verify zero voltage across the HV bus bars at the motor inverter. Check voltage between positive and negative terminals, positive to chassis ground, and negative to chassis ground. All readings must be below 5V DC. Document voltage readings. Do not proceed if any voltage is detected above safe levels.
2. 2

   Drain motor cooling system
   Locate coolant drain valve on motor housing lower section. Attach drain hose to valve and route to drain pan. Open drain valve and allow motor coolant circuit to fully drain. Note coolant condition and quantity removed for comparison during refill. Close drain valve when flow stops.
3. 3

   Disconnect high-voltage power cables
   While wearing high-voltage insulated gloves, remove protective covers from HV connector on motor inverter. Label each phase cable (U, V, W) with position markers. Remove locking collar from HV connector assembly. Carefully disconnect each phase cable from inverter terminals. Secure cables away from work area. Inspect connector pins and seals for damage or corrosion.
4. 4

   Disconnect motor cooling lines
   Identify inlet and outlet coolant lines on motor housing. Use appropriate disconnect tool or wrench to release quick-connect fittings. Remove coolant hoses from motor housing. Cap or plug open ports to prevent contamination. Inspect hoses and O-rings for wear or damage.
5. 5

   Disconnect motor sensors and communication cables
   Locate motor temperature sensor, resolver or encoder connector, and CAN bus communication connector on motor housing. Release connector locks and carefully disconnect all sensor harnesses. Label each connector for correct reinstallation. Secure harnesses away from motor removal path.
6. 6

   Remove CV axle connections
   Remove CV axle retaining hardware at motor output shafts. For dual output motors, both left and right axles must be disconnected. Use appropriate tools to release axle splines from motor output shaft. Support axle shafts and secure to suspension or frame to prevent damage. Do not allow axles to hang unsupported.
7. 7

   Support motor assembly
   Position transmission jack or equivalent motor support fixture under center of motor assembly. Adjust support to contact motor housing securely without applying lifting pressure. Ensure support is stable and will prevent motor from tilting during removal. Use safety straps or chains to secure motor to jack.
8. 8

   Remove motor mounting bolts
   Identify all motor-to-subframe or motor-to-cradle mounting bolts. Typical configuration includes 4-6 primary mounting points. Support motor weight with jack before removing bolts. Remove mounting bolts in cross-pattern to maintain even support. Keep track of bolt locations as lengths may vary by position. Note any ground straps or brackets attached to mounting points.
9. 9

   Lower and remove motor assembly
   Verify all connections and mounting points are disconnected. Carefully lower transmission jack while guiding motor assembly clear of subframe and surrounding components. Watch for any remaining interference with hoses, cables, or suspension components. Once clear of mounting area, lower motor to ground level. Transfer motor to suitable work surface or stand.
10. 10

    Inspect mounting points and interfaces
    Examine motor mounting surfaces on subframe for damage, cracks, or excessive wear. Check mounting bolt threads for damage or corrosion. Inspect motor output shaft seals and splines for wear. Clean mounting surfaces with appropriate solvent. Verify new or replacement motor matches removed unit specifications.
11. 11

    Install replacement motor assembly
    Position replacement motor on transmission jack with proper orientation verified. Raise motor into mounting position, aligning with subframe mounting points. Guide motor carefully to avoid contact with surrounding components. Align mounting holes without forcing motor position. Support motor weight with jack throughout installation process.
12. 12

    Install motor mounting bolts
    Install all motor mounting bolts hand-tight in cross-pattern sequence. Verify correct bolt length at each position and reinstall any ground straps or brackets. Once all bolts are started, torque mounting bolts to manufacturer specification in cross-pattern sequence. Note: Specific torque values not available in database - consult Rivian service information for exact specifications.
13. 13

    Reconnect CV axles
    Install CV axle shafts into motor output shaft splines. Ensure axles are fully seated with proper spline engagement. Install axle retaining hardware and torque to specification. Verify both axles (if dual output motor) are properly secured and have appropriate free play without excessive looseness.
14. 14

    Reconnect motor sensors and communication cables
    Reconnect motor temperature sensor, resolver/encoder connector, and CAN bus communication connectors according to labels applied during removal. Ensure connectors are fully seated and locking mechanisms are engaged. Verify proper routing of harnesses away from heat sources and moving components.
15. 15

    Reconnect motor cooling lines
    Install new O-rings on coolant line fittings lubricated with appropriate coolant. Connect coolant inlet and outlet hoses to motor housing. Ensure quick-connect fittings are fully engaged with audible click. Verify hose routing does not create kinks or stress points.
16. 16

    Reconnect high-voltage power cables
    While wearing high-voltage insulated gloves, install new connector seals on HV terminals. Reconnect each phase cable (U, V, W) to correct inverter terminal according to labels. Install locking collar on HV connector assembly. Torque HV connections per manufacturer specification if applicable. Install protective covers over HV connectors. Verify all connections are secure and properly sealed.
17. 17

    Refill motor cooling system
    Fill motor cooling circuit with new EV Battery/Motor Coolant through designated fill point. Use approximately 10 quarts or until coolant level reaches proper mark. Burp cooling system by running coolant pump (if vehicle supports service mode) or following manufacturer bleeding procedure. Top off coolant as needed. Check for leaks at all connection points.

Reassembly

1. Reinstall motor splash shields and underbody aerodynamic panels
2. Install wheels and torque lug nuts to specification
3. Lower vehicle to ground
4. Remove lockout/tagout device from HV disconnect
5. Reinstall HV safety plug in service disconnect location
6. Reconnect 12V battery negative terminal
7. Verify all tools and equipment are removed from vehicle

Verification

• Connect Rivian diagnostic tool and clear stored fault codes from motor replacement procedure
• Perform HV system integrity test using diagnostic tool to verify proper insulation resistance (typically >500 megohms)
• Enable high-voltage system and verify motor inverter status shows no faults
• With vehicle in service mode or on lift with wheels free, verify motor rotates smoothly in both directions without noise or vibration
• Perform motor encoder/resolver calibration procedure using diagnostic tool
• Test drive vehicle in safe area, verifying smooth acceleration, regenerative braking function, and absence of unusual noises or vibrations
• Re-inspect all HV connections, coolant connections, and mounting bolts for proper torque and security
• Check motor cooling system for leaks after test drive when system is at operating temperature
• Verify motor temperature sensor reading is within normal range on diagnostic tool
• Perform final fault code scan and verify no new codes are present
• Document motor serial number and update vehicle service records

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