🔧 Transmission Fluid - Drain and Fill

This procedure replaces the Toyota hybrid transaxle fluid on your Prius V. It is a drain-and-fill service, not a flush, and the fluid level is set through the fill/check port. This is a good maintenance item to help keep the hybrid transaxle running smoothly.

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

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⚠️ Safety & Precautions

• Work on a level surface and set the parking brake.
• Hybrid system precautions apply: keep the vehicle OFF and do not press the brake pedal or power button while underneath.
• Let the transaxle cool before draining. Hot fluid can burn you.
• Use jack stands. Never rely on a floor jack alone.
• Do not overfill. The fluid level is set by overflow at the correct temperature.
• No battery disconnect is normally required for this service.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 12mm socket
• 14mm hex socket or Allen socket
• Torque wrench
• Drain pan
• Fluid pump or hand pump
• Floor jack (rated 3-ton minimum)
• Jack stands
• Wheel chocks
• Shop towels
• Gloves
• Safety glasses
• Trim clip removal tool

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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 drain plug gasket - Qty: 1
• Transmission fill plug gasket - Qty: 1

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📋 Before You Begin

• Park on level ground and engage the parking brake.
• Let the vehicle sit long enough for the transaxle to cool.
• Raise and support the front of the vehicle securely with jack stands.
• Loosen the fill plug first.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the lower cover

• Use the 10mm socket and 12mm socket to remove the engine under cover fasteners and lower splash shield.
• Set the hardware aside in order so it goes back in the same spots.

Step 2: Loosen the fill plug

• Use the 14mm hex socket to loosen the transmission fill plug first.
• If the fill plug will not loosen, do not drain the fluid yet.
• Torque to 49 Nm (36 ft-lbs) on reinstall.

Step 3: Drain the old fluid

• Place the drain pan under the transaxle.
• Use the 14mm hex socket to remove the drain plug.
• Let the fluid drain completely.
• Replace the drain plug gasket with a new one.
• Torque to 49 Nm (36 ft-lbs) on reinstall.

Step 4: Reinstall the drain plug

• Install the drain plug by hand first to avoid cross-threading.
• Use the torque wrench and 14mm hex socket to tighten it to spec.

Step 5: Fill with new ATF WS fluid

• Use the fluid pump to pump Toyota ATF WS into the fill hole.
• Keep filling until fluid starts to run back out of the fill opening.
• Install a new fill plug gasket.
• Torque to 49 Nm (36 ft-lbs) on reinstall.

Step 6: Set the final level

• Start the vehicle only if needed to circulate fluid, then return it to OFF.
• For the Prius V transaxle, the final level is correct when fluid is at the bottom edge of the fill port and just begins to dribble out.
• If you opened the system at the wrong angle, lower the vehicle and recheck on level ground.

Step 7: Reinstall the under cover

• Use the 10mm socket and 12mm socket to reinstall the splash shield and under cover.
• Make sure all clips and bolts are fully seated.

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✅ After Repair

• Start the vehicle and check for leaks at both plugs.
• Take a short road test and listen for unusual noises.
• Recheck for seepage after the test drive.
• Dispose of old fluid properly at a recycling center.

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💰 DIY vs Shop Cost

Shop Cost: $180-$320 (parts + labor)

DIY Cost: $45-$80 (parts only)

You Save: $135-$240 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1-2 hours.

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🎯 Ready to get started?

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