🔧 Tucson - Automatic Transmission Fluid Drain and Fill

This procedure changes the automatic transmission fluid in your Tucson using the drain-and-fill method. Your Tucson’s 6-speed automatic transmission does not use a normal dipstick, so the final level is checked through a level/check plug at the correct fluid temperature.

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

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⚠️ Safety & Precautions

• ⚠️ Transmission fluid can be hot. Wear gloves and safety glasses.
• ⚠️ Keep your Tucson level while filling and checking fluid level.
• ⚠️ Always support the vehicle with jack stands. Never work under a vehicle held only by a jack.
• ⚠️ Do not drain the fluid until you confirm the fill plug can be loosened.
• ⚠️ Use only Hyundai-approved SP-IV automatic transmission fluid.
• ⚠️ A scan tool that reads transmission fluid temperature gives the most accurate fluid level check.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 17mm socket
• 24mm socket
• Ratchet wrench 3/8-inch drive
• Socket extension 6-inch 3/8-inch drive
• Torque wrench 3/8-inch drive foot-pound
• Fluid transfer pump 1-quart
• Drain pan 10-quart
• Measuring container 5-quart
• OBD2 scan tool with transmission fluid temperature data (specialty)
• Infrared thermometer (specialty)
• Floor jack rated 3-ton minimum
• Jack stands rated 3-ton minimum
• Wheel chocks
• Nitrile gloves
• Safety glasses
• Shop towels lint-free

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Automatic transmission fluid meeting Hyundai SP-IV specification - Qty: 4-5 quarts
• Transmission drain plug crush washer - Qty: 1
• Transmission fill plug gasket or O-ring - Qty: 1
• Transmission level check plug gasket or O-ring - Qty: 1

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📋 Before You Begin

• 🚗 Park your Tucson on a flat, level surface.
• 🧱 Place wheel chocks behind the rear wheels.
• 🅿️ Set the parking brake.
• 🌡️ Let the transmission cool if the vehicle was just driven.
• 📏 Measure the old fluid that comes out so you know roughly how much to add back.
• 🔍 Your Tucson has no regular transmission dipstick. Fluid level is set using the level/check plug.
• 🧰 A fluid transfer pump is a hand pump that moves new fluid from the bottle into the transmission.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise and Support Your Tucson

• Use a floor jack rated 3-ton minimum to lift the front of your Tucson.
• Place jack stands rated 3-ton minimum under the proper front support points.
• If needed, lift and support the rear with jack stands rated 3-ton minimum so the vehicle sits level.
• Gently shake the vehicle by hand to make sure it is stable.
• Level vehicle equals correct fluid level.

Step 2: Remove the Lower Splash Shield

• Put on safety glasses and nitrile gloves.
• Use a 10mm socket, socket extension 6-inch 3/8-inch drive, and ratchet wrench 3/8-inch drive to remove the lower splash shield bolts.
• Lower the splash shield and set it aside.

Step 3: Find the Transmission Plugs

• Use shop towels lint-free to clean around the transmission plugs.
• Locate the drain plug at the lower part of the transmission case.
• Locate the fill plug higher on the transmission case.
• Locate the level/check plug on the side of the transmission case.
• The level/check plug lets extra fluid drain out when the fluid level is correct.

Step 4: Loosen the Fill Plug First

• Use a 24mm socket, socket extension 6-inch 3/8-inch drive, and ratchet wrench 3/8-inch drive to loosen the fill plug.
• Do not remove the drain plug until the fill plug can be opened.
• If the fill plug is stuck, stop the job and reinstall anything removed.
• Never drain before confirming refill access.

Step 5: Drain the Old Fluid

• Place a drain pan 10-quart under the transmission drain plug.
• Use a 24mm socket and ratchet wrench 3/8-inch drive to remove the drain plug.
• Let the fluid drain until it slows to a drip.
• Pour the drained fluid into a measuring container 5-quart to measure the amount removed.
• Clean the drain plug with shop towels lint-free.

Step 6: Reinstall the Drain Plug

• Install a new transmission drain plug crush washer on the drain plug.
• Thread the drain plug in by hand first. This prevents cross-threading.
• Use a 24mm socket and torque wrench 3/8-inch drive foot-pound to tighten the drain plug to Torque to 35 Nm (26 ft-lbs).

Step 7: Add New Transmission Fluid

• Remove the fill plug fully using a 24mm socket and ratchet wrench 3/8-inch drive.
• Use a fluid transfer pump 1-quart to pump in the same amount of automatic transmission fluid meeting Hyundai SP-IV specification that came out.
• Add about 0.25 quart extra so the final level check can drain off the excess.
• Install the fill plug by hand only for now.

Step 8: Warm the Fluid for Level Check

• Connect an OBD2 scan tool with transmission fluid temperature data (specialty).
• Start the engine and keep your foot on the brake.
• Move the shifter slowly through P, R, N, D, then back to P.
• Pause about 3 seconds in each gear position.
• Let the engine idle until transmission fluid temperature is about 50-60°C (122-140°F).
• If you do not have a scan tool, use an infrared thermometer (specialty) on the transmission pan area as a less-accurate backup.
• Scan tool temperature is the best method.

Step 9: Set the Final Fluid Level

• Keep the engine idling and the shifter in Park.
• Place the drain pan 10-quart under the level/check plug.
• Use a 17mm socket and ratchet wrench 3/8-inch drive to remove the level/check plug.
• If fluid flows out steadily, wait until it becomes a light trickle.
• If no fluid comes out, reinstall the level/check plug loosely, turn the engine OFF, add 0.25-0.5 quart with the fluid transfer pump 1-quart, then repeat the check.
• The correct level is reached when fluid lightly trickles from the check port at the correct temperature.

Step 10: Tighten the Level/Check Plug

• Install a new transmission level check plug gasket or O-ring if your plug uses one.
• Thread the level/check plug in by hand.
• Use a 17mm socket and torque wrench 3/8-inch drive foot-pound to tighten it to Torque to 35 Nm (26 ft-lbs).

Step 11: Tighten the Fill Plug

• Turn the engine OFF.
• Install a new transmission fill plug gasket or O-ring if your fill plug uses one.
• Use a 24mm socket and torque wrench 3/8-inch drive foot-pound to tighten the fill plug to Torque to 35 Nm (26 ft-lbs).
• Wipe the transmission case clean with shop towels lint-free.

Step 12: Reinstall the Lower Splash Shield

• Lift the lower splash shield into position by hand.
• Start all bolts by hand first.
• Use a 10mm socket, socket extension 6-inch 3/8-inch drive, and ratchet wrench 3/8-inch drive to tighten the bolts snugly.

Step 13: Lower the Vehicle

• Use the floor jack rated 3-ton minimum to lift your Tucson slightly off the jack stands.
• Remove the jack stands rated 3-ton minimum.
• Lower your Tucson slowly to the ground using the floor jack rated 3-ton minimum.

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✅ After Repair

• ✅ Test drive your Tucson for 10-15 minutes with light throttle.
• ✅ Make sure shifts feel smooth and normal.
• ✅ Park on level ground and check underneath for leaks.
• ✅ If shifting feels harsh, delayed, or unusual, stop driving and recheck the fluid level at the correct temperature.
• ✅ Recycle the used transmission fluid at an approved fluid recycling location.

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💰 DIY vs Shop Cost

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

DIY Cost: $55-$120 (parts only)

You Save: $165-$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?

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