🔧 Forte - Automatic Transmission Fluid Drain and Refill

Assumption: This procedure is for the factory 6-speed automatic transmission. It does not apply to a manual transmission.

This service drains part of the old fluid and replaces it with Kia-specification ATF. The transmission has no dipstick, so the final level must be checked with the engine running and the fluid at the specified temperature.

Difficulty Level: Intermediate | Estimated Time: 1.5-2 hours

---

⚠️ Safety & Precautions

• ⚠️ Support your Forte on four jack stands. The vehicle must remain level during the fluid-level check.
• ⚠️ Never work beneath a vehicle supported only by a floor jack.
• ⚠️ Automatic transmission fluid can cause severe burns. Wear gloves and safety glasses.
• ⚠️ Keep your hands, clothing, and tools away from the cooling fans while the engine is running.
• ⚠️ Use only fluid labeled Hyundai/Kia ATF SP-IV. Multi-vehicle fluid is unsuitable unless it explicitly lists SP-IV approval.
• ⚠️ Do not use a pressurized transmission flush machine. A drain and refill is the safer service method.
• 🔋 Battery disconnection is not required.

---

🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack rated 2-ton minimum
• Four jack stands rated 2-ton minimum
• Wheel chocks
• 10mm socket
• 12mm socket
• 24mm socket
• 3/8-inch drive ratchet
• 3/8-inch drive extension set
• 3/8-inch drive torque wrench rated 10-80 ft-lbs
• Plastic trim-clip removal tool
• OBD-II scan tool with live transmission-temperature data
• ATF hand-transfer pump with flexible hose
• Graduated drain pan marked in liters
• Fluid measuring container marked in 100mL increments
• Digital level
• Shop-light rated for automotive use
• Nitrile mechanic gloves
• Safety glasses
• Absorbent shop towels

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Hyundai/Kia ATF SP-IV automatic transmission fluid - Qty: 5 liters
• Transmission drain-plug sealing washer - Qty: 1
• Transmission fill-plug sealing washer - Qty: 1
• Transmission level-plug sealing washer - Qty: 1
• Brake cleaner - Qty: 1 can

---

📋 Before You Begin

• 🚗 Drive for approximately 10 minutes, then park your Forte on firm, level ground.
• 🛑 Apply the parking brake and place wheel chocks behind the rear wheels.
• 📏 Use the floor jack and four jack stands to raise the entire vehicle. Verify with the digital level that the rocker-panel area is level front-to-rear and side-to-side.
• 🔍 Connect the OBD-II scan tool before draining. “Live data” means sensor information displayed while the vehicle is operating.
• 🧊 Allow hot components to cool until they can be approached safely.
• 📝 The normal drain-and-refill amount is approximately 3.5-4.0 liters, but the temperature-based level check determines the final amount.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the Lower Splash Shield

• Use a 10mm socket and 3/8-inch drive ratchet to remove the shield bolts beneath the engine and transmission.
• Use the plastic trim-clip removal tool to release the plastic retainers without breaking them.
• Lower the shield and arrange the fasteners in removal order.
• Photograph fastener locations before removal.

Step 2: Locate and Loosen the Fill Plug First

• Use the shop light to identify the transmission fill plug on the upper transmission case, below the air-filter housing area.
• If access is restricted, use a 10mm socket, 12mm socket, ratchet, and extension to remove the air-intake duct and air-filter housing fasteners.
• Use the 24mm socket, extension, and ratchet to loosen the fill plug before draining any fluid.
• Do not continue unless the fill plug can be removed. This prevents leaving the transmission empty if the plug is seized.

Step 3: Drain the Old Fluid

• Position the graduated drain pan beneath the transmission drain plug.
• Use the 24mm socket and ratchet to remove the drain plug slowly.
• Allow the fluid to drain until it falls to an occasional drip. This commonly takes 10-15 minutes.
• Record the exact amount drained and inspect the fluid for metallic flakes, a burnt odor, or a milky appearance.
• A light coating of gray paste on the magnetic plug is normal. Large chips or needle-like fragments require professional transmission inspection.

Step 4: Install the Drain Plug

• Use absorbent shop towels and brake cleaner to clean the plug and sealing surface. Spray the cleaner onto the towel rather than into the transmission.
• Install a new drain-plug sealing washer.
• Thread the drain plug in by hand first to prevent cross-threading.
• Use the 24mm socket and torque wrench to tighten the drain plug to Torque to 39-49 Nm (29-36 ft-lbs).

Step 5: Add New SP-IV Fluid

• Use the fluid measuring container to measure the replacement fluid.
• Place the ATF hand-transfer pump hose securely into the fill opening.
• Pump in approximately the same amount of Hyundai/Kia ATF SP-IV that was drained.
• Install the fill plug with a new sealing washer and tighten it temporarily with the 24mm socket. Final torque will be applied after the level check.

Step 6: Circulate the New Fluid

• Confirm that your Forte remains level and securely supported on all four jack stands.
• Connect the OBD-II scan tool and display automatic-transmission-fluid temperature.
• Start the engine and hold the brake pedal firmly.
• Move the selector slowly through P-R-N-D, pausing approximately three seconds in each position. Repeat twice, then leave it in Park with the engine idling.
• Do not raise engine speed. Idling is sufficient to fill the hydraulic passages.

Step 7: Check the Fluid at the Correct Temperature

• Monitor the scan tool until transmission-fluid temperature reaches 50-60°C (122-140°F).
• Keep the engine idling and the vehicle level.
• Use the correctly fitting socket from the listed 10mm, 12mm, and 24mm socket set to remove the transmission level plug carefully.
• A thin stream or steady drip indicates the correct level.
• If no fluid comes out, reinstall the level plug loosely, stop the engine, remove the fill plug with the 24mm socket, and use the ATF hand-transfer pump to add SP-IV fluid in 200mL increments.
• Restart the engine, cycle through P-R-N-D, verify the temperature remains within range, and check the level again.
• If fluid pours out heavily, let it drain until it becomes a thin stream.
• Temperature and vehicle level both matter.

Step 8: Tighten the Level and Fill Plugs

• Install a new sealing washer on the level plug.
• Use the appropriate listed socket and torque wrench to tighten the level plug to Torque to 35-44 Nm (26-32 ft-lbs).
• Stop the engine.
• Use the 24mm socket and torque wrench to tighten the fill plug to Torque to 35-44 Nm (26-32 ft-lbs).
• Use absorbent shop towels and brake cleaner to clean spilled fluid from the outside of the transmission.

Step 9: Reassemble and Lower the Vehicle

• Reinstall the air-filter housing and intake duct with the 10mm socket, 12mm socket, ratchet, and extension.
• Reinstall the lower splash shield using the plastic trim-clip removal tool and 10mm socket.
• Use the floor jack to lift each end slightly, remove the four jack stands, and lower your Forte carefully.
• Remove the wheel chocks only after the vehicle is fully on the ground.

---

✅ After Repair

• ✅ Start the engine and confirm the transmission-warning light remains off.
• 🚗 Take a gentle 10-minute test drive. Check that Reverse and Drive engage normally and that shifts are smooth.
• 🔍 Park on clean, level ground and inspect the drain, fill, and level plugs for leaks.
• 🧾 Record the mileage and the use of SP-IV fluid in the service history.
• ♻️ Take the used fluid to an authorized oil-recycling or hazardous-waste facility. Do not pour it onto the ground or into a drain.
• ⚠️ If the old fluid contained metal fragments, smelled severely burnt, or the transmission slips afterward, stop driving and obtain professional diagnosis.

---

💰 DIY vs Shop Cost

Shop Cost: ₹7,000-₹13,000 (parts + labor)

DIY Cost: ₹3,500-₹6,500 (parts only)

You Save: ₹3,500-₹6,500 by doing it yourself!

Labor rates around Sonīpat vary. This repair takes a shop approximately 1-1.5 hours.

---

🎯 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.