How to Change Tail Lights | Fix A Burnt-Out Bulb

For the full breakdown, see our best USA Tail Lights guide.

One burnt-out tail light isn’t just an annoyance—it’s a safety hazard and a ticket waiting to happen. Most cars hide the tail light housing behind a simple access panel in the trunk or hatch, and the swap itself comes down to a few twists and clips.

What You Need Before You Start

Gather these before you pop the trunk: the correct replacement bulb or assembly, a screwdriver or socket set, and a pair of gloves. Check the owner’s manual first—it names the exact bulb type and shows where the access panel sits on your specific model.

If your car has integrated LED tail lights, you may not have a replaceable bulb at all. Many modern vehicles seal the LEDs into the housing, which means the whole assembly comes out and a new one goes in.

Park on level ground, turn the engine off, and let the lamp cool. Bulbs and housings stay hot for a while after driving.

How To Swap The Bulb

This is the most common repair, and it works the same way on most cars, trucks, and SUVs.

1. Open the trunk, hatch, or tailgate and find the access panel behind the tail light. Interior trim covers it on many models.
2. Remove the trim or access panel—pull the plastic clips, unscrew the retainers, or peel back the trunk liner. Some vehicles need the whole assembly pulled instead of just the socket.
3. Twist the bulb socket counterclockwise to release it from the housing, then pull it free.
4. Remove the old bulb from the socket. Most tail lights use wedge or bayonet bases—pull one straight out, twist the other.
5. Install the replacement bulb wearing gloves. Touching halogen glass with bare fingers leaves oil that shortens the bulb’s life.
6. Twist the socket back into the housing and reconnect the electrical connector.
7. Test every function before you reassemble—brake lights, running lights, turn signals, and reverse. The bulb is good when each one lights up as it should.

If the bulb still won’t light after the swap, the issue may be a corroded socket, a blown fuse, or a loose connector. Check those before you assume the new bulb is faulty.

When The Whole Assembly Needs To Come Out

Sealed LED housings and some conventional designs force you to replace the entire tail light assembly rather than just the bulb. The job takes a little longer but follows the same logic.

Open the trunk and remove any trim blocking the mounting hardware. Some vehicles—particularly trucks—require removing the rear bumper cover to reach the bolts, according to O’Reilly Auto Parts. Unbolt the assembly, set it aside carefully, and disconnect the electrical connector. Compare the new unit to the old one to confirm the design and connector match before you install it. Tighten the fasteners snug but don’t crank them—overtightening cracks plastic housings.

Reconnect the battery if you disconnected it, then run the same full-function test before snapping the trim back into place.

Mistakes That Bite

The most common failures aren’t electrical—they’re mechanical. Here’s what trips people up:

• Forcing the housing. If it won’t budge, you missed a hidden clip, nut, or tab. Check the manual before you pry.
• Using the wrong bulb. The socket style and connector must match the original. AutoZone’s guide stresses confirming the replacement fits your vehicle’s design.
• Bare-handed halogen bulbs. The oil from your skin creates hot spots that kill the bulb early.
• Overtightening fasteners. Snug is enough. More torque equals cracked plastic.
• Skipping the test. Reassembling before testing hides failed bulbs, loose connectors, and reversed fitment.

Advance Auto Parts adds that if your vehicle lacks a simple access panel, the disassembly gets more involved—at that point, factory repair information matters more than a general guide.

Sometimes the brake light works but the running light doesn’t, or vice versa. That usually means one filament in a dual-filament bulb burned out while the other still functions—replace the bulb and both work again.