How to Replace 2015 F-150 Tail Light | 15-Minute DIY

A 2015 Ford F-150 tail light is removed by opening the tailgate, pulling two 8mm bolts, and sliding the assembly straight rearward off its retaining pins.

A burned-out brake light, turn signal, or marker on your 2015 F-150 is a quick fix with basic tools and no mechanical experience. The same method works for bulb swaps and full assembly removal on 2015–2020 models, though LED-equipped trucks have a slightly different connector setup. Below is the exact process, the tool you need, and the mistakes that crack plastic housings.

What You Need to Replace a 2015 F-150 Tail Light

The job calls for exactly one tool and the correct replacement bulb or assembly. The two mounting bolts are 8mm, so an 8mm socket and ratchet (or a nut driver) is all you touch with metal.

• Tool: 8 mm socket and ratchet (or a nut driver).
• Bulb types (incandescent models): 3157 for brake/taillight/turn signal and 3156 for reverse light. One guide also lists the upper bulb as 3157K.
• LED replacement caveat:

If you’re replacing the whole assembly rather than just a bulb, aftermarket options are available for 2015–2017 trucks, but confirm whether your truck uses factory incandescent or LED lights — the connectors differ between the two.

How to Remove the Tail Light Assembly and Change the Bulbs

Park on level ground, turn off the truck, and open the tailgate fully. Every 2015 F-150 tail light comes off the same way.

1. Open the tailgate. This gives you clear access to the two bolts on the rear face of the lamp assembly.
2. Remove the two 8mm bolts. They sit horizontally on the back of the housing. Set them aside in a safe spot.
3. Pull the assembly straight rearward. The lamp is held in place by two or more plastic retaining studs or clips. Pull directly back — yanking at an angle can snap the tabs. A trim tool can help, but gentle hand pressure usually works.
4. Disconnect the wiring harness. If you’re removing the assembly fully, press the tab on the connector and pull it free. If you’re only changing bulbs, you can work through the bulb sockets without unplugging the housing.
5. Twist bulb sockets counterclockwise to unlock them from the housing. Pull the socket free and then pull the old bulb straight out.
6. Insert the new bulb into the socket — push firmly until it seats. Reinstall the socket into the housing and rotate it clockwise until it locks.
7. Reinstall the assembly. Align the retaining studs with the body holes, push the unit straight in until it seats flush, and reconnect the wiring plug if you disconnected it.
8. Reinstall the two 8mm bolts and tighten them snugly — do not overtighten.

Common Mistakes That Break Tail Light Clips

The step that trips up most first-timers is pulling the housing at an angle. Clips are easy to snap on an F-150, and broken ones mean a loose or rattling light. Guides specifically warn against pulling on the wiring harness instead of the bulb holder itself — the tab on the connector is designed for firm pressure, but the wires are not.

Another frequent error is failing to align the studs before pressing the assembly back into the body. The studs are plastic, and forcing them in sideways can crack both the lamp and the truck’s mounting points. A quick visual check before pushing saves a lot of hassle.

If you are replacing bulbs, verify the new bulb matches the factory type. Plugging the wrong bulb into a 3157 socket can cause dim lighting or a short. After the swap, test every function — low/brake side, bright/turn side, and reverse — before closing the tailgate.

For readers planning to upgrade their tail lights, our tested guide to the best 2015 F-150 tail lights covers aftermarket assemblies, LED upgrades, and factory replacements.