🔧 Highlander - Automatic Transmission Fluid Change

This repair drains and refills the automatic transmission fluid on your Highlander. Fresh ATF helps protect the transmission clutches, valve body, and torque converter from wear caused by old or overheated fluid.

Difficulty Level: Intermediate | Estimated Time: 1.5-2.5 hours

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⚠️ Safety & Precautions

• ⚠️ Transmission fluid gets hot. Let the exhaust and transmission cool before working underneath.
• ⚠️ Support your Highlander with jack stands if lifting it. Never work under a vehicle held only by a jack.
• ⚠️ Keep the vehicle level during the final fluid level check. An uneven vehicle can cause an incorrect fill level.
• ⚠️ Use only Toyota WS automatic transmission fluid or an equivalent fluid specifically approved for Toyota WS.
• ⚠️ Do not flush the transmission with chemicals or high-pressure machines. A drain-and-fill is safer for this transmission.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Wheel chocks
• Floor jack rated 3-ton minimum
• Jack stands rated 3-ton minimum
• 10mm socket
• 14mm socket
• 24mm socket
• 3/8-inch ratchet
• 1/2-inch ratchet
• 3-inch extension
• Torque wrench rated 10-80 Nm
• Drain pan 8-quart minimum
• Fluid transfer pump (specialty)
• Scan tool with live data (specialty)
• Infrared thermometer (specialty)
• Measuring container marked in quarts
• Shop towels
• Funnel

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Toyota WS automatic transmission fluid - Qty: 4 quarts
• Transmission drain plug gasket - Qty: 1
• Transmission fill plug gasket - Qty: 1

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📋 Before You Begin

• Park your Highlander on level ground.
• Set the parking brake and place wheel chocks behind the rear wheels.
• This transmission uses a sealed-style level check. That means there is no dipstick; fluid level is checked at a specific temperature through an overflow/check tube.
• A scan tool with live data is the best way to read ATF temperature. Live data means the scan tool shows real-time sensor values.
• If you do not have a scan tool, use an infrared thermometer on the transmission pan as a backup, but it is less accurate than scan data.
• Measure the amount drained. Refill the same amount first, then perform the temperature-based level check.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Warm the transmission slightly

• Start the engine and let it idle for 2-3 minutes.
• Press the brake pedal and move the shifter slowly through P, R, N, D, then back to P.
• Turn the engine OFF.
• This helps the old fluid drain more completely without becoming dangerously hot.

Step 2: Raise and support the vehicle level

• Use the floor jack rated 3-ton minimum to lift the front of your Highlander at the front center jacking point.
• Place jack stands rated 3-ton minimum under the front support points.
• If needed, lift the rear with the floor jack rated 3-ton minimum and support it with jack stands rated 3-ton minimum.
• Confirm the vehicle sits level front-to-back and side-to-side.
• Keep the wheel chocks in place.

Step 3: Remove the lower splash shield

• Put on safety glasses and nitrile gloves.
• Use a 10mm socket, 3/8-inch ratchet, and 3-inch extension to remove the lower engine/transmission splash shield bolts.
• Set the splash shield and bolts aside in order.
• Take a photo before removing bolts.

Step 4: Locate the transmission fill plug first

• Find the transmission fill plug on the side of the transmission case.
• Use a 24mm socket and 1/2-inch ratchet to loosen the fill plug before draining fluid.
• Do not remove the drain plug until you know the fill plug can be opened.
• If the fill plug is stuck, stop and do not drain the transmission.

Step 5: Drain the old ATF

• Place the drain pan 8-quart minimum under the transmission drain plug.
• Use a 14mm socket and 3/8-inch ratchet to remove the transmission drain plug.
• Let the ATF drain until it slows to a drip.
• Pour the drained fluid into the measuring container marked in quarts.
• Record exactly how much came out.

Step 6: Reinstall the drain plug

• Install a new transmission drain plug gasket onto the drain plug.
• Thread the drain plug in by hand first to avoid cross-threading.
• Use the 14mm socket and torque wrench rated 10-80 Nm to tighten the drain plug. Torque to 49 Nm (36 ft-lbs).

Step 7: Refill the transmission

• Remove the fill plug fully using the 24mm socket and 1/2-inch ratchet.
• Use the fluid transfer pump (specialty) to pump in the same amount of Toyota WS automatic transmission fluid that drained out.
• Add about 0.25 quart extra to prepare for the overflow level check.
• Install the fill plug finger-tight for now.

Step 8: Bring ATF to checking temperature

• Connect the scan tool with live data (specialty) to the diagnostic port under the driver side dash.
• Select transmission data and watch ATF temperature.
• Start the engine and leave it idling.
• With your foot on the brake, move the shifter slowly through each gear position, pausing 3 seconds in each range, then return to Park.
• Keep the engine idling until ATF temperature is about 35-45°C (95-113°F).
• If using the infrared thermometer (specialty), aim it at the transmission pan near the drain plug as a backup reading.

Step 9: Set the final fluid level

• Keep the engine idling and the vehicle level.
• Place the drain pan 8-quart minimum under the transmission.
• Use the 14mm socket and 3/8-inch ratchet to remove the overflow/check plug if equipped separately, or follow the drain plug/overflow tube design carefully.
• At the correct ATF temperature, fluid should come out as a thin stream, then slow to a drip.
• If no fluid comes out, reinstall the plug, add 0.25 quart through the fill hole using the fluid transfer pump (specialty), and check again.
• When the flow becomes a light drip, the level is correct.

Step 10: Tighten the check and fill plugs

• Install a new transmission fill plug gasket on the fill plug.
• Use the 24mm socket and torque wrench rated 10-80 Nm to tighten the fill plug. Torque to 39 Nm (29 ft-lbs).
• Use the 14mm socket and torque wrench rated 10-80 Nm to tighten the check/drain plug if removed. Torque to 49 Nm (36 ft-lbs).
• Wipe the area clean with shop towels.

Step 11: Reinstall the lower splash shield

• Lift the splash shield into position by hand.
• Start all bolts by hand first.
• Use the 10mm socket, 3/8-inch ratchet, and 3-inch extension to tighten the splash shield bolts snugly.

Step 12: Lower the vehicle

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

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✅ After Repair

• ✅ Test drive your Highlander for 10-15 minutes.
• ✅ Confirm smooth shifts from Park to Reverse and Drive.
• ✅ Recheck underneath for leaks after the test drive.
• ✅ If shifting feels harsh or delayed, recheck the ATF level at the specified temperature.
• ✅ Dispose of used ATF properly at an oil recycling center or repair shop.

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💰 DIY vs Shop Cost

Shop Cost: $220-$380 (parts + labor)

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

You Save: $175-$290 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-1.5 hours.

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