Electric Drive Motor R&R

This procedure covers the removal and replacement of an electric drive motor on the 2023 Rivian EDV 500 dual motor AWD system, including disconnection of high voltage systems, coolant system service, and motor mounting components.

Warnings

Tools required

Parts

• Electric drive motor assembly × 1 — Use OEM specification
• Motor mounting bolts/hardware kit × 1 — Use OEM specification
• High voltage connector seals × 2 — Use OEM specification
• Coolant line O-rings × 4 — Use OEM specification
• Motor output shaft seal × 1 — Use OEM specification

Fluids

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

Preparation

1. Ensure vehicle is parked on level surface with parking brake engaged and wheel chocks in place
2. Verify 12V battery is fully charged for diagnostic tool operation
3. Connect Rivian diagnostic scan tool and document any existing fault codes
4. Allow motor and coolant system to cool to ambient temperature (minimum 2 hours after operation)
5. Gather all high voltage safety equipment including insulated gloves, safety glasses, and lockout/tagout devices
6. Review vehicle-specific service information for the specific motor being replaced (front or rear)
7. Prepare clean workspace for motor removal with adequate lighting

Procedure

1. 1

   Disable High Voltage System
   Using Rivian diagnostic tool, initiate high voltage system shutdown procedure. Disconnect 12V auxiliary battery negative terminal. Wait 15 minutes for capacitor discharge. Verify zero voltage at high voltage distribution module using high voltage multimeter. Install lockout/tagout device on high voltage service disconnect.
2. 2

   Raise and Support Vehicle
   Raise vehicle on lift to comfortable working height. Remove wheel and tire assembly on the side of motor being replaced. Remove underbody panels and skid plates to access motor and drivetrain components. Secure all removed fasteners in organized containers.
3. 3

   Drain Coolant System
   Place drain pan beneath motor coolant lines. Using coolant drain tool, open drain valve on motor cooling circuit. Drain coolant completely from motor cooling system. Disconnect coolant supply and return lines from motor housing. Cap open coolant lines immediately to prevent contamination. Remove and inspect coolant line O-rings for damage.
4. 4

   Disconnect High Voltage Cables
   Wearing high voltage insulated gloves, remove protective cover from motor inverter connection. Remove high voltage cable retention bolts. Carefully disconnect three-phase power cables from motor terminals. Inspect high voltage connector seals and replace if any damage is visible. Secure cables away from work area with non-conductive ties.
5. 5

   Disconnect Motor Sensors and Wiring
   Disconnect motor resolver/encoder connector from motor housing. Disconnect motor temperature sensor connector. Disconnect any ground straps attached to motor housing. Label all connectors for proper reassembly orientation. Secure wiring harnesses away from motor removal path.
6. 6

   Drain Transmission Fluid
   Place drain pan beneath motor/gearbox assembly. Remove transmission fluid drain plug and allow fluid to drain completely. Inspect drain plug and washer; replace if damaged. Note fluid condition and check for metal particles indicating internal damage.
7. 7

   Disconnect Driveshaft or Axle Half-Shaft
   Mark orientation of driveshaft/half-shaft to motor output flange for proper alignment during reassembly. Remove mounting bolts securing driveshaft or half-shaft to motor output flange. Support driveshaft/axle and secure away from motor using mechanics wire or suspension strap. Do not allow driveshaft to hang unsupported.
8. 8

   Support Motor Assembly
   Position transmission jack or motor support fixture beneath motor assembly. Adjust jack to contact motor housing securely. Apply slight upward pressure to relieve weight from motor mounts. Ensure motor is stable and properly balanced on support fixture before proceeding.
9. 9

   Remove Motor Mounting Bolts
   Remove all motor mounting bolts securing motor to subframe or motor cradle. There are typically 4-6 mounting points depending on motor position. Keep track of bolt locations as lengths may vary. Check for any bracket or brace attachments that must be removed. Verify all mounting hardware is removed before attempting to lower motor.
10. 10

    Remove Motor Assembly
    Carefully lower motor assembly using transmission jack while guiding output shaft clear of surrounding components. Watch for any wiring or coolant lines that may still be connected. Once clear of mounting points, carefully roll motor assembly away from vehicle. Place motor on clean work surface or motor stand. Cover exposed output shaft and openings to prevent contamination.
11. 11

    Inspect and Prepare New Motor
    Inspect new motor assembly for any shipping damage or missing components. Verify motor part number matches vehicle specification for front or rear position. Check that all mounting bosses and threaded inserts are clean and undamaged. Install new output shaft seal if not pre-installed. Apply thin coat of appropriate lubricant to output shaft splines.
12. 12

    Install New Motor Assembly
    Position new motor on transmission jack and raise to approximate installation height. Carefully guide motor into position, aligning output shaft with driveline components and ensuring proper clearance around all mounting points. Align motor mounting holes with subframe/cradle mounting points. Do not force motor into position; verify alignment before proceeding.
13. 13

    Install Motor Mounting Hardware
    Install all motor mounting bolts and hand-tighten in star pattern to ensure even seating. Since torque specifications are not available in database, follow manufacturer service procedure for proper tightening sequence and values. Verify motor is properly seated against all mounting surfaces before final tightening. Remove transmission jack once motor is secured.
14. 14

    Reconnect Driveshaft and Wiring
    Reconnect driveshaft or half-shaft to motor output flange, aligning marks made during disassembly. Install and tighten mounting bolts per manufacturer specifications. Reconnect motor resolver/encoder connector. Reconnect motor temperature sensor connector. Reattach all ground straps to motor housing. Verify all connectors are fully seated and locked.
15. 15

    Reconnect High Voltage and Coolant
    Install new O-rings on coolant line connections. Reconnect coolant supply and return lines to motor housing and secure with clamps. Wearing high voltage gloves, reconnect three-phase power cables to motor terminals with new high voltage connector seals. Torque high voltage connections per manufacturer specification. Install protective cover over inverter connection. Fill motor cooling circuit with specified EV Battery/Motor Coolant to proper level.
16. 16

    Refill Transmission Fluid and Reassemble
    Refill motor/gearbox assembly with 10 quarts of EV Transmission Fluid through fill port. Verify fluid level is correct per service procedure. Install drain plug with new washer. Reinstall underbody panels and skid plates. Install wheel and tire assembly and torque lug nuts to specification. Lower vehicle to ground.

Reassembly

1. Reconnect 12V auxiliary battery negative terminal
2. Remove high voltage lockout/tagout device
3. Using Rivian diagnostic tool, initialize new motor and perform motor learning procedure
4. Clear all fault codes and verify no new codes are present
5. Perform high voltage system integrity test using diagnostic tool
6. Pressure test coolant system to verify no leaks at motor connections
7. Verify proper transmission fluid level with vehicle at operating temperature
8. Test all motor sensors reading properly in diagnostic tool

Verification

• Start vehicle and verify no warning lights or fault codes related to drive motor system
• Perform test drive in safe area, verifying smooth motor operation with no unusual noises or vibrations
• Test acceleration and regenerative braking function on replaced motor
• Verify motor temperature rises normally during operation and coolant is circulating
• Recheck all high voltage connections and coolant connections for leaks after test drive
• Verify motor output shaft connections have no play or looseness
• Use diagnostic tool to verify motor resolver/encoder signals are within specification
• Document motor serial number and installation date in vehicle service records
• Recheck transmission fluid level after test drive and top off if necessary

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