🔧 Sonata - Rear Taillight Bulb Replacement

On your Sonata, the rear lamps can be a mix of replaceable bulbs (usually turn signal/reverse) and non-serviceable LED sections (often the tail/running light and brake light on higher trims). I’ll walk you through the bulb-access method from inside the trunk, and I’ll also show you how to confirm whether your “taillight” is actually an LED module that can’t be re-bulbed.

Difficulty Level: Beginner | Estimated Time: 0.5-1.0 hours

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⚠️ Safety & Precautions

• ⚠️ Turn the car OFF and keep the key fob at least 10 feet away.
• ⚠️ Do not touch any orange high-voltage cables or connectors in the trunk area.
• ⚠️ Let bulbs cool before handling; they can be hot.
• ⚠️ Wear gloves and avoid touching a new bulb’s glass with bare fingers.

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🔧 Required Tools

You'll need the following tools for this repair:

• Nitrile gloves
• Safety glasses
• Plastic trim removal tool
• Phillips #2 screwdriver
• 10mm socket
• 1/4" drive ratchet
• Small flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear turn signal bulb (match OE bulb number) - Qty: 2
• Rear reverse light bulb (match OE bulb number) - Qty: 2
• Rear lamp housing (if your “taillight” is LED and not serviceable) - Qty: 1

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Open the trunk and remove any cargo so you can access the side trunk liners.
• If you’re not sure which bulb it is, turn on the lights and press the brake (have a helper) to confirm which function is out.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Confirm whether the failed light is a bulb or LED

• Use a small flashlight and look closely at the section that’s out.
• If that section has a bulb socket on the back of the lamp (you’ll see a twist-lock socket), it’s serviceable.
• If there is no socket for that section and it’s a sealed LED area, the “bulb” is not replaceable and the lamp assembly is replaced as a unit.
• If you tell me which light is out, I’ll confirm.

Step 2: Access the rear lamp sockets (trunk side)

• Open the trunk.
• Use a plastic trim removal tool to gently pop open the access cover behind the taillamp (or pull back the trunk side liner near the lamp).
• If your liner is held by clips/screws, remove them with a Phillips #2 screwdriver.

Step 3: Remove the bulb socket

• Find the socket that corresponds to the failed function (turn/reverse).
• Grip the socket and rotate it counterclockwise by hand to unlock it, then pull it straight out.
• If it’s tight, use a plastic trim removal tool to help you get a better grip without damaging plastic.

Step 4: Replace the bulb

• Pull the old bulb straight out of the socket by hand (some types twist slightly first).
• Install the new bulb fully into the socket.
• Use nitrile gloves to keep oils off the bulb.

Step 5: Reinstall the socket and test

• Insert the socket back into the lamp.
• Twist clockwise by hand until it locks.
• Turn the car ON and test: parking lights, brake lights, turn signals, and reverse lights.

Step 6: Repeat on the other side and reassemble trim

• Repeat Steps 2–5 for the other rear lamp.
• Reinstall any trunk trim clips/screws using a Phillips #2 screwdriver.

Step 7: If the failed “taillight” is an LED section (lamp removal overview)

• Remove the trunk side liner enough to access the lamp mounting nuts.
• Use a 10mm socket and 1/4" drive ratchet to remove the lamp nuts.
• Support the lamp and pull it straight rearward to release the alignment pins.
• Install the replacement lamp and reinstall nuts: Torque to 7 Nm (62 in-lbs).

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✅ After Repair

• Confirm all rear light functions work on both sides (tail/running, brake, turn, reverse).
• If a new bulb still doesn’t work, swap it to the other side to verify the bulb isn’t defective, then inspect the socket for corrosion.
• Make sure the trunk liner is clipped back fully so it won’t rattle.

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💰 DIY vs Shop Cost

Shop Cost: $80-$200 (parts + labor)

DIY Cost: $10-$40 (parts only)

You Save: $70-$160 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 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.

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Quick check (2 questions so I can make this 100% accurate):

• Which exact light is out: tail/running light, brake light, turn signal, or reverse light?
• Is it out on both left and right sides, or just one side?