How to Change Transmission Fluid on a 2018 Hyundai Ioniq (6-Speed DCT)
Step-by-step drain-and-refill guide with correct fluid, tools list, safety tips, and leak checks
How to Change Transmission Fluid on a 2018 Hyundai Ioniq (6-Speed DCT)
Step-by-step drain-and-refill guide with correct fluid, tools list, safety tips, and leak checks
🔧 Ioniq - Transmission Fluid Change (DCT)
On your Ioniq, the “transmission fluid” service is a drain-and-refill on the 6-speed dual-clutch transmission (DCT). The correct fluid type and the exact fill/level-check procedure can vary by transmission code and production details, so I want to lock that down before you start.
Difficulty Level: Intermediate | Estimated Time: 1.0-2.0 hours
⚠️ Safety & Precautions
- 🛑 Work on a level surface and support the car with jack stands before getting underneath.
- 🧤 Transmission fluid can be hot—let the drivetrain cool to avoid burns.
- 🔋 This is a hybrid: do not touch orange high-voltage cables/connectors.
- 🔌 Battery disconnect is not required for a basic drain/refill.
🔧 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 tool
- Socket set (metric)
- Ratchet
- Torque wrench (metric, 10–100 Nm range)
- Fluid transfer pump (specialty)
- Drain pan (at least 8-quart)
- Funnel
- Shop rags
🔩 Required Parts
HowToo sells all the parts you need for this repair:
- Genuine-spec DCT transmission fluid (per your Ioniq’s transmission spec) - Qty: 2–3 quarts
- Drain plug crush washer (if equipped) - Qty: 1
- Fill plug crush washer (if equipped) - Qty: 1
đź“‹ Before You Begin
- 🧠Confirm: Are we talking about the 6-speed DCT in your Ioniq (not an eCVT)?
- âť“ Do you want a simple drain-and-refill (recommended DIY), or were you trying to do a full fluid exchange/flush?
- Park on level ground, set the parking brake, and chock the rear wheels.
- Raise the front and support with jack stands; the car needs to sit level for an accurate fluid level check.
🔨 Step-by-Step Instructions
Follow these steps in order:
Step 1: I’ll tailor the exact procedure after 2 quick answers
- Please reply with: (1) Yes/No it’s the 6-speed DCT, and (2) drain-and-refill or full exchange.
- Once confirmed, I’ll provide the exact plug locations, level-check method, and the correct Hyundai fluid spec for your setup.
âś… After Repair
- Check for leaks around the drain/fill plugs after a short drive.
- Confirm smooth shifting and no warning lights.
đź’° DIY vs Shop Cost
Shop Cost: $220-$450 (parts + labor)
DIY Cost: $60-$140 (parts only)
You Save: $160-$310 by doing it yourself!
Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-2.0 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.
