🔧 Santa Fe - Automatic Transmission Fluid Drain & Level-Check Fill

This service replaces a portion of your A/T fluid by draining the pan and refilling to the correct level. On your Santa Fe, the fluid level is checked through a plug at a specific fluid temperature (most do not have a dipstick), so temperature and vehicle level are critical.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.0 hours

Assumption: 6-speed Hyundai A/T with check/fill plug level procedure (common on this Santa Fe).

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⚠️ Safety & Precautions

• ⚠️ Work on a level surface; the level check is inaccurate if the vehicle is tilted.
• ⚠️ Use jack stands (rated 3-ton minimum)—never rely on a jack alone.
• ⚠️ Transmission fluid gets hot; wear nitrile gloves and safety glasses.
• ⚠️ Keep clear of moving parts while the engine is running during the level check.
• ⚠️ No battery disconnect is 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
• Drain pan (at least 10-quart)
• Metric socket set 8mm-19mm
• Ratchet 3/8"
• Torque wrench 3/8"
• Trim clip remover
• Shop rags
• Brake cleaner spray
• Fluid transfer pump (specialty)
• OBD2 scan tool with live data (specialty)
• Infrared thermometer
• Measuring container (at least 6-quart)

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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: 6-8 quarts
• Transmission drain plug crush washer - Qty: 1
• Transmission fill/level plug crush washer - Qty: 1

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📋 Before You Begin

• Park the Santa Fe on a level surface and set the parking brake.
• Place wheel chocks at the rear wheels.
• Warm the transmission with a short 10-minute drive so the fluid drains more completely.
• Set up your OBD2 scan tool with live data (specialty) to view transmission fluid temperature (often labeled TFT/ATF Temp). This lets you do the level check at the correct temperature.
• If you don’t have a scan tool, use an infrared thermometer on the transmission pan as a rough backup, but scan data is preferred.
• A “crush washer” is a soft sealing washer that should be replaced.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise and support the vehicle level

• Use a floor jack (rated 3-ton minimum) to lift the front, then place jack stands (rated 3-ton minimum).
• If needed to keep the Santa Fe level for the final check, lift the rear and support with jack stands (rated 3-ton minimum) too.
• Verify stability with a gentle shake before going underneath.

Step 2: Remove the lower splash shield (undercover)

• Use a metric socket set 8mm-19mm with a ratchet 3/8" to remove any bolts.
• Use a trim clip remover to pop out plastic clips without breaking them.
• Set fasteners aside in a small tray so nothing gets lost.

Step 3: Locate the transmission drain plug and fill/level plug

• Place a drain pan (at least 10-quart) under the transmission pan area.
• Wipe the area with shop rags so dirt can’t fall into the case.
• Always loosen the fill plug first.

Step 4: Crack loose the fill plug (before draining)

• Use the appropriate tool from your metric socket set 8mm-19mm and ratchet 3/8" to loosen (do not fully remove yet) the fill/level plug.
• If it won’t loosen, stop and do not drain—you must be able to refill.

Step 5: Drain the old fluid

• Use the appropriate socket from the metric socket set 8mm-19mm with a ratchet 3/8" to remove the drain plug.
• Let the fluid drain until it slows to an occasional drip.
• Pour the drained fluid into a measuring container (at least 6-quart) so you know how much to put back in.

Step 6: Reinstall the drain plug with a new washer

• Clean the drain plug and sealing surface using shop rags and brake cleaner spray.
• Install a new transmission drain plug crush washer on the drain plug.
• Thread the drain plug in by hand first to avoid cross-threading.
• Tighten using a torque wrench 3/8": Torque to 35-45 Nm (26-33 ft-lbs).

Step 7: Fill with new fluid (initial fill)

• Fully remove the fill plug using a ratchet 3/8" and correct socket from the metric socket set 8mm-19mm.
• Use a fluid transfer pump (specialty) (a hand pump that pushes fluid uphill) to pump in Hyundai/Kia SP-IV compatible fluid.
• Add roughly the same amount you measured out, then add an extra ~0.25 quart to account for minor losses.
• Install the fill plug finger-tight for now.

Step 8: Start engine, cycle gears, and warm to level-check temperature

• Start the engine with your foot on the brake.
• With the engine idling, move the shifter slowly through each gear (P-R-N-D and manual ranges if equipped), pausing 2-3 seconds in each.
• Use your OBD2 scan tool with live data (specialty) to monitor ATF temperature.
• Target the common Hyundai level-check window: 50-60°C (122-140°F).
• If using an infrared thermometer, aim at the transmission pan near the plug area as a rough reference.

Step 9: Perform the level check (two common plug styles)

• Keep the engine idling, vehicle level, and ATF temp in the 50-60°C (122-140°F) range.
• Style A (single “level/fill” plug):
  • Use the correct socket from the metric socket set 8mm-19mm with a ratchet 3/8" to remove the plug carefully.
  • Correct level is usually a thin stream that becomes a steady drip.
  • If no fluid comes out, add fluid using the fluid transfer pump (specialty) until it starts to drip.
• Style B (fill plug plus separate overflow/level plug):
  • Use the metric socket set 8mm-19mm and ratchet 3/8" to remove the small overflow/level plug.
  • Add fluid through the fill port using the fluid transfer pump (specialty) until it dribbles from the overflow.
• When the flow becomes a drip, install a new transmission fill/level plug crush washer and reinstall the plug.
• Tighten using a torque wrench 3/8": Torque to 25-35 Nm (18-26 ft-lbs).

Step 10: Reinstall the splash shield

• Reinstall the undercover using the ratchet 3/8" and metric socket set 8mm-19mm.
• Reinstall clips using the trim clip remover to align them, then press them in by hand.

Step 11: Lower the vehicle

• Use the floor jack (rated 3-ton minimum) to lift slightly, remove the jack stands (rated 3-ton minimum), then lower the Santa Fe.
• Remove the wheel chocks.

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✅ After Repair

• Start the engine and check underneath for leaks around the drain and fill/level plugs.
• Take a 10-15 minute test drive. Confirm smooth shifts and no slipping or flares.
• Park on a level surface and recheck for leaks again.
• Dispose of used ATF properly (most auto parts stores accept used fluids).

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💰 DIY vs Shop Cost

Shop Cost: $250-$450 (parts + labor)

DIY Cost: $60-$140 (parts only)

You Save: $190-$310 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-2.5 hours.

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