🔧 Tucson - Transmission Fluid Change

This job drains and refills the automatic transmission fluid in your Tucson. The transmission uses a level-check plug instead of a dipstick, so the final fluid level must be checked with the transmission warmed to 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 check is not accurate if the Tucson is tilted.
• ⚠️ Automatic transmission fluid gets hot enough to burn skin; wear gloves and eye protection.
• ⚠️ Support the Tucson with jack stands if lifting it. Never rely on a floor jack alone.
• ⚠️ Keep the engine running during the final level check, but keep hands, tools, and clothing away from fans, belts, and exhaust parts.
• ⚠️ Use only Hyundai/Kia SP-IV specification automatic transmission fluid. Do not mix universal fluid unless it specifically meets SP-IV.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 17mm socket
• 24mm socket
• 3/8-inch ratchet
• 3/8-inch extension
• Torque wrench 10-80 Nm
• Fluid transfer pump
• OBD-II scan tool with transmission temperature data
• Drain pan 8-quart minimum
• Measuring container 6-quart minimum
• Funnel with long flexible neck
• Trim clip removal tool
• Floor jack rated 3-ton minimum
• Jack stands rated 3-ton minimum
• Nitrile gloves
• Safety glasses
• Shop towels

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Automatic transmission fluid SP-IV - Qty: 5 quarts
• Transmission drain plug crush washer - Qty: 1
• Transmission level check plug washer - Qty: 1
• Transmission fill plug washer - Qty: 1
• Underbody splash shield clips - Qty: As needed

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📋 Before You Begin

• 🅿️ Park the Tucson on a flat, level surface and set the parking brake.
• 🌡️ Start with the transmission warm, not hot. A short 5-10 minute drive helps the fluid drain better.
• 📏 Measure the old fluid after draining it. This gives you a safe starting point for refill amount.
• 🔍 A scan tool is needed because “ATF temperature” means the transmission fluid temperature shown in live data.
• 🧰 A fluid transfer pump is a hand pump used to push new fluid into the transmission fill port.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise and Secure the Tucson

• Use the floor jack rated 3-ton minimum to lift the front of the Tucson at the proper front lift point.
• Place jack stands rated 3-ton minimum under the approved support points.
• Make sure the Tucson is sitting level front-to-rear and side-to-side before checking fluid later.
• Level vehicle equals correct fluid level.

Step 2: Remove the Lower Splash Shield

• Put on safety glasses and nitrile gloves.
• Use a 10mm socket to remove the splash shield bolts.
• Use a trim clip removal tool to remove any plastic clips.
• Set the splash shield aside where it will not get stepped on.

Step 3: Locate the Transmission Plugs

• Use a shop towel to wipe dirt away from the drain, fill, and level check plug areas.
• The drain plug is at the bottom of the transmission case.
• The level check plug is on the side/lower area of the transmission case and is used to set the final fluid height.
• The fill plug is higher on the transmission case and may be easier to access from above or through the side depending on tool angle.

Step 4: Confirm the Fill Plug Opens First

• Use the correct socket, commonly a 24mm socket, to carefully loosen the fill plug before draining fluid.
• If the fill plug does not loosen, stop. Do not drain the transmission until you know you can refill it.
• Remove the fill plug washer and plan to replace it during reassembly.

Step 5: Drain the Old Transmission Fluid

• Place the drain pan 8-quart minimum under the transmission drain plug.
• Use a 17mm socket to remove the drain plug slowly.
• Let the fluid drain until it slows to a drip.
• Use a measuring container 6-quart minimum to measure how much fluid came out.
• Expect roughly 4-5 quarts on a drain-and-fill.

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 so it does not cross-thread.
• Use a torque wrench 10-80 Nm and 17mm socket to tighten the drain plug.
• Torque to 34-44 Nm (25-32 ft-lbs).

Step 7: Add New Transmission Fluid

• Use a fluid transfer pump or funnel with long flexible neck to add Hyundai/Kia SP-IV fluid through the fill opening.
• Add the same amount you measured from the old fluid, then add about 0.25 quart extra to prepare for the level check.
• Install the fill plug loosely for now using the 24mm socket.
• Do not final-tighten the fill plug yet.

Step 8: Warm the Transmission Fluid

• Connect the OBD-II scan tool with transmission temperature data to the diagnostic port under the dashboard.
• Start the engine and keep the Tucson in Park.
• With your foot on the brake, slowly move the shifter through P-R-N-D and back to Park, pausing 3 seconds in each position.
• Watch the ATF temperature on the scan tool.
• The target level-check range is 50-60°C (122-140°F).

Step 9: Check and Set the Fluid Level

• Keep the engine running and the Tucson level.
• Place the drain pan 8-quart minimum under the level check plug.
• Use the correct socket, commonly a 24mm socket, to remove the level check plug.
• If fluid comes out in a thin stream, let it drain until it becomes a slow drip.
• If no fluid comes out, use the fluid transfer pump to add SP-IV fluid through the fill port until fluid starts coming out of the level check hole.
• When the fluid is a slow drip at 50-60°C (122-140°F), the level is correct.

Step 10: Reinstall the Level Check Plug

• Install a new transmission level check plug washer.
• Use the torque wrench 10-80 Nm and the correct socket to tighten the level check plug.
• Torque to 34-44 Nm (25-32 ft-lbs).

Step 11: Final-Tighten the Fill Plug

• Shut the engine off after the level check plug is installed.
• Install a new transmission fill plug washer.
• Use the torque wrench 10-80 Nm and 24mm socket to tighten the fill plug.
• Torque to 34-44 Nm (25-32 ft-lbs).

Step 12: Reinstall the Splash Shield

• Use a shop towel to clean any spilled fluid from the transmission case.
• Raise the splash shield back into place.
• Use the trim clip removal tool to reinstall reusable clips or install new underbody splash shield clips if any broke.
• Use a 10mm socket to reinstall the splash shield bolts snugly.

Step 13: Lower the Tucson

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

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✅ After Repair

• ✅ Test drive the Tucson for 10-15 minutes and check that shifts are smooth.
• ✅ Park on a clean surface and check underneath for leaks at the drain, fill, and level check plugs.
• ✅ Recheck for drips after the next drive.
• ✅ Dispose of used transmission fluid at a recycling center or auto parts store that accepts waste oil.
• ✅ If shifting feels harsh, delayed, or the fluid was very dark/burnt, a second drain-and-fill after a few hundred miles may help refresh more fluid.

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💰 DIY vs Shop Cost

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

DIY Cost: $55-$110 (parts only)

You Save: $125-$210 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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