Hybrid Electric Assist Drive Motor Assembly for 2023-2026 Toyota - Rear

A quick look at your own vehicle makes sure the right engine shows up:

• Confirm your vehicle is equipped with the E-Four (AWD) system.
• Confirm your vehicle's VIN 5th digit: 'A' or 'B' for 2025 Camry; 'C' or 'D' for 2023-2025 Corolla; 'B' for 2023-2025 Corolla Cross; 'D' for 2023-2025 Prius.
• Physically inspect your rear electric motor housing and match the OEM part number to G105028040 or G105028041.
• Verify the Fluid Spec on the fill plug or owner's manual specifies e-Transaxle Fluid TE.

What the install really takes — plan and budget with confidence:

Special tools this job needs:

• Class 0 rated insulated gloves (rated for 1,000V AC / 1,500V DC) with leather outer protectors
• CAT III / CAT IV Digital Multimeter
• Toyota Techstream Diagnostic Scan Tool (or equivalent professional-grade bi-directional scanner)
• HV Service Plug Puller
• Fluid Pump
• Torque Wrench

Budget for these consumables at install:

• Toyota Genuine e-Transaxle Fluid TE (P/N 08886-81986 or 08886-02605) - approx 1.2 liters
• New Drain and Fill Plug Gaskets/Washers (Toyota OEM crush washers)
• New Axle Shaft Seals
• High-Voltage Connector O-Rings / Seals

What your vehicle’s computers will need after the swap:

What’s involved: Resolver Calibration / Angle Sensor Calibration

The rear electric motor contains a resolver (rotary sensor) that tells the hybrid vehicle's inverter the exact position and speed of the motor's rotor. When replacing the rear motor assembly, you must perform a Resolver Calibration using a Toyota Techstream scan tool (or equivalent professional diagnostic tool) so the inverter can properly synchronize with the new motor. Sources differ on whether this is strictly required for a complete assembly swap, but it is highly recommended to ensure proper operation and clear high-voltage system codes.

Pro tips for a smooth first start-up — hand them to whoever does the install:

• HIGH-VOLTAGE DANGER: You must pull the high-voltage service plug and wait at least 10 minutes for the high-voltage capacitors to discharge. Use a CAT III/IV multimeter to verify zero voltage at the rear motor terminal block before disconnecting the orange high-voltage cables.
• The 'e-Transaxle Fluid TE' Viscosity Trap: Do not assume this unit uses standard Toyota ATF WS. Toyota transitioned to the thinner 'TE' fluid for 5th-generation hybrid systems. Putting the wrong fluid in will destroy the internal bearings and gears.
• Resolver Connector Fragility: The low-voltage resolver connector on the motor housing is made of plastic and is highly fragile. Be extremely careful when unplugging or plugging it in.
• Slow-Fill Requirement: When filling the eAxle with fluid, you must add it slowly to prevent false indications of being full.
• Do Not Roll the Vehicle: Once the high-voltage system is disabled, the vehicle should not be rolled on its wheels, as this can cause the electric motors to generate voltage.

Easy to get right once you know them:

• Ordering for the Wrong Drivetrain (FWD vs. AWD): You cannot install this rear electric motor in a Front-Wheel Drive (FWD) hybrid vehicle.
• Using the Wrong Fluid (ATF WS vs. TE): Filling the 2023+ hybrid transaxles with older Toyota ATF WS fluid leads to rapid transmission/motor failure.
• Neglecting the Resolver Calibration: Assuming this is a simple 'plug-and-play' mechanical swap without performing the necessary scan tool calibrations.
• Damaging the High-Voltage Cable Connector: Forcing the high-voltage orange cable connector onto the motor terminal block can bend the internal pins.
• Contaminating the HV Connection: Allowing dirt, dust, or moisture to get into the high-voltage electrical connection during installation.

Not issues with the units on this page — the manufacturer documented these for every engine of this family, wherever you buy one. Handy for your installer: