2015 Jeep Wrangler Bulb Size Guide

Quick Reference Bulb Size Chart: 2015 Jeep Wrangler

Note: The 2015 Jeep Wrangler (JK generation) came standard with halogen reflector headlights. Unlike some other vehicles, there was no optional HID or factory LED headlight system available this year. All trim levels (Sport, Sahara, Rubicon) use the same H13 dual-filament bulb for both low and high beams.

LED vs. Halogen Upgrade Considerations

Upgrading your 2015 Wrangler's lighting to LED is one of the most popular modifications for good reason. LEDs offer a brighter, whiter light output, significantly improving nighttime visibility on and off the road. They also have a much longer lifespan and consume less power. However, there are a few key things to consider before you swap out your old halogen bulbs.

First, the Wrangler's electrical system, which uses CANBUS (Controller Area Network Bus), monitors the electrical current of the lighting circuits. Since LEDs draw significantly less power than halogen bulbs, the system can misinterpret this as a burnt-out bulb. This triggers a "bulb out" warning on your dashboard and can cause the LED to flicker or "hyperflash" (in the case of turn signals). To fix this, you will need to install a CANBUS-compatible LED bulb or an anti-flicker harness/resistor. These devices essentially tell the vehicle's computer that the bulb is drawing the correct amount of power, eliminating errors.

For the H13 headlights, a quality LED conversion kit will typically include an anti-flicker harness. For smaller bulbs like the 3157 turn signals or 194 side markers, you may need to purchase "CANBUS-ready" bulbs or wire in load resistors separately for each bulb.

How to Replace Each Bulb

Replacing the bulbs on a 2015 Wrangler is straightforward and requires basic hand tools.

• Headlights (H13): This is the most involved, but still easy. You'll need to remove the front grille by popping the top retaining clips and pulling it forward. Then, remove the four Torx T-15 screws holding the metal headlight retaining ring. The entire headlight assembly will come out. Unplug the harness, swap the H13 bulb, and reassemble. Be careful not to touch the new bulb glass with your bare hands, as oils can cause it to burn out prematurely.
• Fog Lights (2504): Access the fog lights from underneath the front bumper. Simply reach up, twist the bulb socket counter-clockwise, pull it out, replace the bulb, and re-insert the socket.
• Front Turn Signals (3157): These are located in the same housing as the DRLs, just below the headlights. Like the fog lights, you can access these from behind the grille or from the wheel well. Twist the socket to remove and replace the bulb.
• Rear Lights (3157 - Turn/Brake/Tail/Reverse): The rear light assembly is held on by two inboard plastic Phillips-head screws. Remove them, and the entire housing pulls straight back off the vehicle. The bulb sockets are now accessible on the back of the housing. Twist to remove, swap the bulbs, and reinstall.
• License Plate Light (194): This small housing is on the stock tire carrier. Squeeze the tabs on the side of the light lens to pop it out. The bulb holder twists out from the back of the lens assembly.
• Front Side Marker (194): This is the small light on the front fender flare. You can often access the back of it through the wheel well liner. Twist the socket to release it, change the bulb, and pop it back in.
• Dome/Map Light (578): For the overhead sound bar or dome light, carefully pry the clear lens off with a small flathead screwdriver or trim removal tool. The 578 festoon-style bulb sits between two metal clips. Gently pull the old one out and pop the new one in.

Common Lighting Issues for This Generation

The JK Wrangler is a robust vehicle, but it has a few known lighting quirks. The most common is the aforementioned CANBUS "flicker" when upgrading to LED without the proper anti-flicker harness. Another issue can be grounding problems, often exacerbated by off-roading. If a whole set of lights (like one tail light assembly) stops working, check the main connector plug and the ground wire for that corner of the vehicle. They can sometimes become loose or corroded. Finally, the stock H13 halogen headlights are notoriously dim by modern standards, which is why LED and projector-style housing upgrades are among the most popular first mods for any new JK owner.

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