🔧 Tucson - Transmission Fluid Drain and Fill

This job replaces part of the automatic transmission fluid in your Tucson. The transmission has no dipstick, so the fluid level must be checked from the level plug while the fluid is at the correct temperature.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a level surface only; the fluid level will be wrong if the Tucson is tilted.
• ⚠️ Transmission fluid gets hot and can burn skin. Wear gloves and safety glasses.
• ⚠️ Support the Tucson with jack stands. Never work under a vehicle held only by a jack.
• ⚠️ Use only Hyundai/Kia SP-IV compatible automatic transmission fluid. The wrong fluid can cause shifting problems.
• ⚠️ Battery disconnect is not required for this repair.
• ⚠️ This is a drain-and-fill service, not a flush. A flush machine is not recommended for a first-time DIY service.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Safety glasses
• Nitrile gloves
• 10mm socket
• 17mm socket
• 24mm socket
• 3/8-inch ratchet
• 1/2-inch ratchet
• Torque wrench (10-80 Nm range)
• Drain pan (8-quart minimum)
• Fluid transfer pump (specialty)
• Long transmission funnel
• OBD2 scan tool with transmission temperature data (specialty)
• Infrared thermometer (optional)
• Shop towels

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Automatic transmission fluid, Hyundai/Kia SP-IV compatible - Qty: 5 quarts
• Transmission drain plug crush washer - Qty: 1
• Transmission level check plug washer - Qty: 1
• Transmission fill plug washer - Qty: 1

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📋 Before You Begin

• Park your Tucson on level ground and set the parking brake.
• Place wheel chocks behind the rear wheels.
• A scan tool is needed because this transmission is filled by temperature, not by a dipstick.
• Transmission fluid temperature means the internal fluid temperature reported by the transmission control module through the OBD2 port.
• Target level-check temperature is approximately 50-60°C (122-140°F).
• Measure the amount of old fluid drained. This helps you add the correct starting amount.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise and Secure the Tucson

• Use the floor jack to raise the front of the Tucson at the proper front lift point.
• Place jack stands under the proper support points.
• If you raise the rear too, keep the Tucson level front-to-back and side-to-side.
• Use wheel chocks before getting underneath.
• Level vehicle equals accurate fluid level.

Step 2: Remove the Lower Engine Cover

• Use a 10mm socket and 3/8-inch ratchet to remove the lower splash shield fasteners.
• Set the shield and fasteners aside in order so they go back in the same places.

Step 3: Locate the Transmission Plugs

• Use a shop towel to clean around the transmission drain plug, level check plug, and fill plug.
• The drain plug is at the bottom of the transmission case.
• The level check plug is on the side of the transmission case and controls final fluid height.
• The fill plug is higher on the transmission and may be reached from above or through the engine bay area.
• Clean plugs prevent dirt entering transmission.

Step 4: Remove the Fill Plug First

• Use the correct socket, commonly a 24mm socket, with a 1/2-inch ratchet to loosen the fill plug.
• Remove the fill plug only after confirming it loosens.
• This prevents draining the transmission and then discovering you cannot refill it.

Step 5: Drain the Old Fluid

• Place the 8-quart drain pan under the transmission drain plug.
• Use a 24mm socket or the correct-size socket for the plug installed on your Tucson to remove the drain plug.
• Let the fluid drain until it slows to a drip.
• Measure the drained fluid amount using the container markings or a clean measuring jug.
• Install a new transmission drain plug crush washer.
• Use the torque wrench to tighten the drain plug to Torque to 35-45 Nm (26-33 ft-lbs).

Step 6: Add New Transmission Fluid

• Use a long transmission funnel or fluid transfer pump to add new SP-IV compatible fluid through the fill opening.
• Add the same amount you drained, then add about 0.25 quart extra to prepare for the level check.
• Install the fill plug loosely by hand for now.
• Start threads by hand first.

Step 7: Warm the Fluid and Cycle the Gears

• Connect the OBD2 scan tool to the diagnostic port under the driver side dash.
• Start the engine and keep your foot firmly on the brake pedal.
• Move the shifter slowly through P-R-N-D, pausing 3 seconds in each position.
• Return the shifter to P and leave the engine idling.
• Watch the transmission fluid temperature on the OBD2 scan tool.

Step 8: Check the Fluid Level at Temperature

• When the scan tool shows approximately 50-60°C (122-140°F), keep the engine idling.
• Place the drain pan under the level check plug.
• Use a 17mm socket or the correct-size socket for the level plug installed on your Tucson to remove the level check plug.
• If fluid runs out in a thin steady stream and then slows to a drip, the level is correct.
• If no fluid comes out, use the fluid transfer pump to add SP-IV fluid through the fill opening until fluid begins to run out of the level hole.
• If a heavy stream pours out, wait until it reduces to a thin stream or drip.

Step 9: Reinstall the Level Check Plug

• Install a new transmission level check plug washer.
• Use the torque wrench and correct socket to tighten the level check plug to Torque to 35-45 Nm (26-33 ft-lbs).
• Wipe the area clean with shop towels.

Step 10: Reinstall the Fill Plug

• Install a new transmission fill plug washer.
• Use the torque wrench and 24mm socket to tighten the fill plug to Torque to 35-45 Nm (26-33 ft-lbs).
• Wipe away spilled fluid with shop towels.

Step 11: Reinstall the Lower Engine Cover

• Position the lower splash shield by hand.
• Use the 10mm socket and 3/8-inch ratchet to reinstall the fasteners snugly.
• Do not overtighten small splash shield bolts.

Step 12: Lower the Tucson

• Use the floor jack to raise the Tucson slightly off the jack stands.
• Remove the jack stands.
• Lower the Tucson slowly to the ground.

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✅ After Repair

• Start the engine and check underneath for leaks while the Tucson is idling.
• Take a gentle 10-15 minute test drive and confirm smooth shifts.
• Recheck for leaks after the test drive.
• Dispose of used transmission fluid at a proper recycling center or auto parts store that accepts used fluid.
• If shifting feels harsh, delayed, or slipping occurs, stop driving and recheck the fluid level at the correct temperature.

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💰 DIY vs Shop Cost

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

DIY Cost: $45-$100 (parts only)

You Save: $135-$250 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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🎯 Ready to get started?

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