🔧 Highlander - Transmission Fluid Replacement

Your Highlander Hybrid uses Toyota hybrid transaxle fluid, not a traditional automatic transmission service. This job drains and refills the hybrid transaxle with the correct Toyota fluid, then verifies the level through the fill plug.

Difficulty Level: Intermediate | Estimated Time: 1-2 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a level surface. Fluid level is checked by the fill hole, so the vehicle must sit level.
• ⚠️ Do not open or touch orange high-voltage cables. Orange cables are part of the hybrid high-voltage system.
• ⚠️ Wear safety glasses and gloves. Transmission fluid can irritate skin and eyes.
• ⚠️ Support your Highlander with jack stands before going underneath. Never rely on a jack alone.
• ⚠️ Always remove the fill plug before the drain plug. This prevents draining the fluid and then discovering the fill plug is stuck.
• ⚠️ Use only Toyota ATF WS or equivalent fluid meeting Toyota WS specification.
• ⚠️ Battery disconnect is not required for this drain-and-fill service if you do not disturb hybrid electrical components.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 24mm socket
• 10mm hex bit socket
• 3/8-inch ratchet
• 1/2-inch ratchet
• 3/8-inch extension set
• Torque wrench rated 20-80 Nm
• Fluid transfer pump (specialty)
• Drain pan rated 8-quart minimum
• Floor jack rated 3-ton minimum
• Jack stands rated 3-ton minimum
• Wheel chocks
• Plastic trim clip remover
• Shop towels
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Toyota ATF WS transmission fluid - Qty: 4 quarts
• Transmission fill plug gasket - Qty: 1
• Transmission drain plug gasket - Qty: 1
• Underbody shield clips - Qty: 1 set

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📋 Before You Begin

• 🅿️ Park your Highlander on a flat, level surface.
• 🧱 Place wheel chocks behind the rear wheels.
• 🚗 Raise the front of your Highlander with a floor jack rated 3-ton minimum.
• 🛑 Support it securely with jack stands rated 3-ton minimum.
• 📏 Keep the vehicle level. If you raise the front, raise the rear to match using safe lift points and jack stands.
• 🧤 Put on safety glasses and nitrile gloves.
• 🌡️ This service is best done with the transaxle warm, not hot. Warm fluid drains better, but hot fluid can burn you.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the Lower Underbody Shield

• Use a 10mm socket to remove the lower shield bolts.
• Use a plastic trim clip remover to remove any plastic clips.
• Set the shield and fasteners aside in order.
• Take a photo first.

Step 2: Locate the Fill and Drain Plugs

• Look at the hybrid transaxle case on the driver-side/front area underneath your Highlander.
• The fill plug is higher on the transaxle case.
• The drain plug is lower on the transaxle case.
• Clean around both plugs with shop towels so dirt does not enter the transaxle.

Step 3: Remove the Fill Plug First

• Use a 24mm socket and 1/2-inch ratchet to loosen the fill plug.
• Remove the fill plug and old gasket by hand.
• If the fill plug does not loosen, stop. Do not drain the fluid until the fill plug can be removed.
• Fill plug first, always.

Step 4: Drain the Old Fluid

• Place a drain pan rated 8-quart minimum under the drain plug.
• Use a 10mm hex bit socket and 3/8-inch ratchet to remove the drain plug.
• Let the fluid drain until it slows to a drip.
• Inspect the old fluid for metal flakes or a burnt smell.
• A light gray paste on the magnetic drain plug is normal wear material.

Step 5: Reinstall the Drain Plug

• Clean the drain plug with shop towels.
• Install a new transmission drain plug gasket on the drain plug.
• Thread the drain plug in by hand first to avoid cross-threading.
• Use a 10mm hex bit socket and torque wrench rated 20-80 Nm.
• Torque to 39 Nm (29 ft-lbs).

Step 6: Refill the Transaxle

• Insert the hose from a fluid transfer pump (specialty) into the fill hole.
• Pump Toyota ATF WS transmission fluid into the transaxle.
• Stop when fluid begins to trickle steadily out of the fill hole.
• The approximate refill amount is about 3.7 quarts, but the correct level is when fluid just runs out of the fill hole with the vehicle level.
• Level vehicle equals correct level.

Step 7: Install the Fill Plug

• Install a new transmission fill plug gasket on the fill plug.
• Thread the fill plug in by hand first.
• Use a 24mm socket and torque wrench rated 20-80 Nm.
• Torque to 39 Nm (29 ft-lbs).

Step 8: Clean and Reinstall the Underbody Shield

• Wipe spilled fluid from the transaxle case using shop towels.
• Reinstall the lower shield by hand-positioning it first.
• Use a plastic trim clip remover to reinstall reusable clips, or install new clips if damaged.
• Use a 10mm socket to reinstall shield bolts.
• Torque to 7 Nm (62 in-lbs) for typical small underbody shield bolts.

Step 9: Lower the Vehicle

• Use a floor jack rated 3-ton minimum to lift your Highlander slightly off the jack stands.
• Remove the jack stands rated 3-ton minimum.
• Lower the vehicle slowly and safely.
• Remove the wheel chocks.

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✅ After Repair

• ✅ Start your Highlander and place it in READY mode.
• 🚗 With your foot on the brake, shift slowly through Park, Reverse, Neutral, and Drive, then return to Park.
• 🔍 Check underneath for leaks at the fill and drain plugs.
• 🚘 Take a short 5-10 minute test drive.
• 🔍 Recheck for leaks after the test drive.
• ♻️ Recycle the old transmission fluid at an auto parts store or recycling center.

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💰 DIY vs Shop Cost

Shop Cost: $180-$350 (parts + labor)

DIY Cost: $45-$90 (parts only)

You Save: $135-$260 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1-1.5 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.