Electric Drive Motor R&R

This procedure covers the removal and replacement of the electric drive motor on a 2024 Rivian EDV 500 with dual motor AWD configuration, including disconnection of high-voltage components, drivetrain separation, and motor removal.

Warnings

Tools required

Parts

• Electric drive motor assembly × 1 — Use OEM specification - specify front or rear
• Motor mounting bolts × 1 — Use OEM specification
• Drive unit coolant hoses × 1 — Use OEM specification if damaged
• High-voltage connector seals × 2 — Use OEM specification
• Motor-to-differential coupler bolts × 1 — Use OEM specification - replace as set
• Ground strap × 1 — Use OEM specification if corroded

Fluids

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

Preparation

1. Verify the vehicle is on a level surface and apply parking brake
2. Place wheel chocks at all four wheels
3. Connect Rivian diagnostic software and document any existing fault codes
4. Use diagnostic software to place vehicle in High-Voltage Service Mode
5. Disconnect 12V auxiliary battery negative terminal and wait 5 minutes
6. Remove rear cargo area floor panels to access high-voltage service disconnect
7. Remove high-voltage service disconnect plug and install lockout/tagout device
8. Wait minimum 5 minutes for high-voltage capacitors to discharge
9. Verify zero voltage at high-voltage busbars using calibrated HV meter
10. Raise vehicle on lift to comfortable working height
11. Remove wheel corresponding to motor being replaced (front or rear)
12. Remove underbody splash shields and protective panels for access to motor compartment
13. Position coolant and transmission fluid drain pans under vehicle

Procedure

1. 1

   Drain coolant from drive unit cooling system
   Locate the drive unit coolant drain valve on the motor cooling circuit. Open the drain valve and allow all coolant to drain into collection pan. On the EDV 500, each motor has its own cooling circuit loop. Expect approximately 5 quarts to drain from each motor circuit.
2. 2

   Drain transmission fluid from drive unit
   Remove the transmission fluid drain plug from the bottom of the drive unit housing. Allow all fluid to drain completely (approximately 10 quarts total for the complete drive unit). Inspect drained fluid for metal particles or contamination that might indicate additional damage.
3. 3

   Disconnect high-voltage cables from motor inverter
   Wearing high-voltage safety gloves, carefully remove the protective cover from the motor inverter assembly. Photograph or mark the orientation of all high-voltage connectors. Remove the locking collar from each HV connector by rotating counterclockwise. Carefully pull each connector straight out from the inverter. The orange cables carry DC voltage from the battery to the inverter. Cap or isolate all disconnected HV terminals.
4. 4

   Disconnect coolant hoses from motor assembly
   Using hose clamp pliers, remove the spring clamps from both the inlet and outlet coolant hoses on the motor assembly. Twist and pull the hoses to remove them from the motor ports. Additional coolant will drain at this point. Inspect hose condition and replace if cracked or deteriorated.
5. 5

   Disconnect motor position sensors and harness connectors
   Locate and disconnect all low-voltage harness connectors from the motor assembly including resolver/encoder connectors, temperature sensors, and any ground straps. Press the connector release tabs and pull straight out. Label each connector with tape to ensure correct reconnection.
6. 6

   Support drive unit with transmission jack
   Position a transmission jack or motor support stand under the center of the drive motor assembly. Raise the jack until it just contacts the motor housing and provides support. Secure the motor to the jack using safety straps or chains to prevent it from shifting during removal.
7. 7

   Remove motor-to-subframe mounting bolts
   Locate the motor mounting bolts that secure the drive motor assembly to the vehicle subframe. There are typically 4-6 mounting points depending on front or rear position. Using a breaker bar and appropriate socket, remove all mounting bolts. Support the weight of the motor with the transmission jack as you remove the final bolts. Keep all mounting hardware organized for reinstallation.
8. 8

   Separate motor from differential and half-shaft assembly
   The motor output shaft connects to the differential input through a splined coupler. Remove the coupler retaining bolts that secure the motor output to the differential. Carefully pry or pull the motor assembly away from the differential housing, ensuring the splines fully disengage. The motor inverter assembly typically remains attached to the motor during removal.
9. 9

   Remove motor assembly from vehicle
   With the motor fully disconnected, carefully lower the transmission jack while guiding the motor assembly out of the vehicle. Navigate around any obstructions such as suspension components or chassis bracing. Once clear of the vehicle, transport the motor to a clean workbench. Cover the motor to prevent contamination.
10. 10

    Inspect motor mounting points and sealing surfaces
    With the motor removed, thoroughly inspect all mounting points on the subframe for cracks, damage, or elongated bolt holes. Check the differential input shaft seals for leakage or damage. Clean all mounting surfaces and mating faces with a wire brush and solvent. Inspect the motor output shaft splines on the removed motor for wear or damage.
11. 11

    Prepare new motor assembly for installation
    Unpack the replacement motor and verify part number matches vehicle specification (front or rear application). If the inverter was removed from the old motor, transfer it to the new motor if required. Ensure all mounting surfaces are clean. Apply a thin coat of anti-seize compound to mounting bolt threads. Verify new high-voltage connector seals are installed in all HV connectors.
12. 12

    Install new motor assembly
    Position the new motor on the transmission jack and raise it into the vehicle. Carefully align the motor output shaft splines with the differential input. Guide the motor into position, ensuring all mounting bosses align with subframe mounting points. Engage the splines fully and install the motor-to-differential coupler bolts finger-tight first to ensure proper alignment.
13. 13

    Install motor mounting bolts
    Install all motor-to-subframe mounting bolts and tighten in a star pattern to ensure even loading. Since specific torque values are not provided in the database, follow torque specifications from Rivian service manual exactly. Verify motor sits flush against all mounting points with no gaps.
14. 14

    Reconnect all sensors, harnesses, and coolant lines
    Reconnect all low-voltage harness connectors to the motor assembly, matching your labels from disassembly. Install ground straps and verify secure connections. Reconnect coolant inlet and outlet hoses, installing new spring clamps in proper position. Ensure hoses are fully seated on the ports before securing clamps.
15. 15

    Reconnect high-voltage cables to inverter
    Wearing high-voltage safety gloves, carefully reconnect each high-voltage cable to the motor inverter in the exact configuration documented during removal. Push each connector straight in until it seats fully, then rotate the locking collar clockwise until it clicks into locked position. Verify each connection is secure and properly locked. Reinstall the inverter protective cover.

Reassembly

1. Install transmission fluid fill plug and refill drive unit with 10 quarts of EV Transmission Fluid through the fill port
2. Close coolant drain valve and refill motor cooling circuit with 10 quarts of EV Battery/Motor Coolant
3. Bleed air from cooling system according to Rivian procedure using diagnostic software
4. Reinstall all underbody shields and protective panels removed for access
5. Reinstall wheel and torque lug nuts to specification
6. Lower vehicle to ground
7. Reconnect 12V auxiliary battery negative terminal
8. Remove lockout/tagout device and reinstall high-voltage service disconnect plug
9. Reinstall cargo area floor panels

Verification

• Connect Rivian diagnostic software and exit High-Voltage Service Mode
• Perform motor commissioning procedure using diagnostic software to pair new motor with vehicle systems
• Check for fault codes and verify motor is communicating properly with vehicle control unit
• Verify coolant level is correct and system is properly bled with no air pockets
• Check transmission fluid level with vehicle level and at operating temperature
• Inspect all high-voltage connections for proper seating and locking
• Check for any coolant or transmission fluid leaks around motor assembly
• Perform a short test drive at low speed to verify motor operation, listening for unusual noises
• Return to shop and recheck all fluid levels after test drive
• Perform full-power acceleration test in safe area to verify motor delivers full torque
• Use diagnostic software to verify motor temperature sensors are reading correctly and cooling system is functioning
• Clear any stored fault codes and verify no new codes are present
• Document motor serial number and installation date in vehicle service records

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