🔧 Taillight Bulb Replacement - Bulb Replacement

Your Sierra uses rear lamp bulbs that can be replaced from inside the bed area by removing each taillamp assembly. This is a quick repair, but take care with the plastic housing and bulb sockets so you do not crack anything or damage the contacts.

Difficulty Level: Beginner | Estimated Time: 0.5-1 hour

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⚠️ Safety & Precautions

• Turn the lights off before starting.
• Let the bulbs cool if they were recently on; they can burn skin.
• Use gentle pressure on the taillamp housing. The plastic tabs can break easily.
• Keep the ignition off while handling bulb sockets.
• No battery disconnect is required for this job.

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🔧 Required Tools

You'll need the following tools for this repair:

• 7mm socket
• 1/4-inch ratchet
• Short extension
• Trim panel tool
• Gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear taillight bulb - Qty: 2
• Electrical contact cleaner - Qty: 1

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Put the transmission in Park.
• Open the tailgate for better access to the taillamp fasteners.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open the tailgate and locate the taillamp fasteners

• Open the tailgate.
• Look at the inner edge of each taillamp assembly in the bed opening.
• You will see the retaining screws that hold each lamp in place.

Step 2: Remove the taillamp assembly

• Use the 7mm socket, 1/4-inch ratchet, and short extension to remove the retaining screws.
• Pull the taillamp straight rearward to release it from the locator pins.
• Pull straight back, not sideways.

Step 3: Remove the bulb socket

• Twist the bulb socket counterclockwise by hand and pull it out of the housing.
• If it feels stuck, use a trim panel tool gently around the socket edge.

Step 4: Replace the bulb

• Remove the old bulb from the socket.
• Install the new bulb by pushing it in firmly until fully seated.
• Do not touch the glass with bare fingers if the bulb is halogen.

Step 5: Reinstall the socket and lamp

• Insert the socket back into the taillamp housing.
• Twist clockwise until locked.
• Set the taillamp assembly back into place on the locator pins.
• Reinstall the screws with the 7mm socket and snug them down.
• Torque to 2.5-3.5 Nm (22-31 in-lbs).

Step 6: Repeat on the other side

• Repeat the same process for the other taillamp.

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✅ After Repair

• Turn on the parking lights and check both taillights.
• Press the brake pedal and confirm both brake lights work.
• Check the turn signals and reverse lights if they share the same assembly.
• If one side still does not work, inspect the socket for corrosion or melted contacts.

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💰 DIY vs Shop Cost

Shop Cost: $120-$220 (parts + labor)

DIY Cost: $20-$50 (parts only)

You Save: $100-$170 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1 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.