🔧 Tucson - Automatic Transmission Fluid Drain & Fill

On your Tucson, the safest DIY transmission service is usually a drain-and-fill (not a full “power flush”). You’ll drain the old fluid from the pan, then refill with the correct Hyundai-spec ATF and set the level correctly to help shifting and transmission life.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a level surface and support the vehicle with jack stands before going underneath.
• ⚠️ Transmission fluid and exhaust parts can be hot; let the vehicle cool, then wear gloves and safety glasses.
• ⚠️ Keep the vehicle level when checking/finalizing fluid level; being tilted can cause under/overfill.
• ⚠️ Never crawl under a vehicle supported only by a jack.
• ⚠️ Battery disconnect is not required for this 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
• Trim clip remover
• Ratchet
• 10mm socket
• Torque wrench (10-100 Nm range)
• Drain pan (10-quart minimum)
• Fluid transfer pump (hand pump) (specialty)
• Long funnel
• OBD2 scan tool with ATF temperature data (specialty)
• Clean rags

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Automatic transmission fluid (Hyundai ATF SP-IV or Hyundai-approved equivalent) - Qty: 4-5 quarts
• Transmission drain plug washer (crush washer) - Qty: 1
• Brake cleaner - Qty: 1

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📋 Before You Begin

• Park on level ground, set the parking brake, and chock the rear wheels.
• Warm the transmission slightly with a 10-15 minute drive so the fluid drains well (not fully hot).
• Confirm you can refill before you drain: locate the fill point first (critical).
• A fluid transfer pump is a hand pump used to push new ATF into a higher fill hole.
• An OBD2 scan tool reads transmission fluid temperature so you don’t overfill/underfill.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Lift and level the Tucson

• Use wheel chocks behind the rear tires.
• Use a floor jack to lift the front, then support with jack stands.
• If needed to keep it level, lift the rear with the floor jack and add jack stands.
• Level vehicle = correct fluid level.

Step 2: Remove the underbody splash shield (if equipped)

• Use a trim clip remover for plastic clips.
• Use a ratchet with 10mm socket to remove splash shield bolts.
• Set hardware aside in a small tray.

Step 3: Identify the drain plug and the fill point

• Place your drain pan under the transmission.
• Find the transmission drain plug at the bottom of the transmission case.
• Locate the fill point (one of these is used on this Tucson):

• Fill plug on the transmission case (side) that requires a fluid transfer pump, or
• Fill through the engine-bay dipstick/fill tube using a long funnel (some vehicles have a capped tube).

Step 4: Drain the old transmission fluid

• Use a ratchet to loosen and remove the drain plug (keep pressure on it until the last thread).
• Let it drain until it becomes a slow drip (typically 10-20 minutes).
• Clean the drain plug with clean rags and spray area lightly with brake cleaner.
• Install a new drain plug washer (crush washer).

Step 5: Reinstall and torque the drain plug

• Thread the drain plug in by hand first to avoid cross-threading.
• Use a torque wrench (10-100 Nm range) to tighten the drain plug: Torque to 39-49 Nm (29-36 ft-lbs).
• If it doesn’t thread smoothly, stop and realign.

Step 6: Measure what came out

• Use the markings on your drain pan (or pour into a marked container) and note how many quarts drained.
• This is your starting refill amount (usually about 3.5-4.5 quarts on a drain-and-fill).

Step 7: Refill with the correct ATF

• If using a case fill plug: use a fluid transfer pump (hand pump) (specialty) to pump in Hyundai ATF SP-IV.
• If using a dipstick/fill tube: use a long funnel to pour in Hyundai ATF SP-IV.
• Start by adding the same amount you drained, then stop.

Step 8: Circulate fluid and set the level

• Start the engine and keep your foot on the brake.
• Slowly move the shifter through each gear (P-R-N-D and manual modes if equipped), pausing 2-3 seconds in each, then return to Park.
• Connect the OBD2 scan tool with ATF temperature data (specialty) and monitor ATF temperature.
• When ATF is in the normal check range (commonly around 50-60°C / 122-140°F), verify level using your vehicle’s fill method:

• If your Tucson has a dipstick: check it with the engine idling in Park and top off in small amounts using the long funnel.
• If your Tucson is checked at the fill/level plug: remove the level/fill plug carefully and top off with the fluid transfer pump until fluid is at the correct level for that port, then reinstall and tighten.

Step 9: Reinstall the splash shield

• Reinstall the splash shield using the ratchet and 10mm socket.
• Reinstall clips using the trim clip remover to line them up, then press to seat.

Step 10: Lower the vehicle

• Use the floor jack to lift slightly, remove jack stands, then lower the vehicle slowly.
• Remove wheel chocks.

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✅ After Repair

• Test drive 10-15 minutes and confirm smooth shifts and no flares/slips.
• Park on clean pavement and check for leaks under the transmission.
• Recheck level one more time using the same method/temperature window you used above.
• Dispose of old ATF at a recycling center/parts store that accepts waste fluids.

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💰 DIY vs Shop Cost

Shop Cost: $220-$450 (parts + labor)

DIY Cost: $40-$90 (parts only)

You Save: $180-$360 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-1.8 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.