2020 Jeep Gladiator Bulb Sizes (Headlight, Tail, Fog)

As an ASE-certified master technician, I’ve seen my fair share of 2020 Jeep Gladiators roll into the shop for lighting upgrades. The Jeep Gladiator (JT generation) burst onto the scene offering unparalleled utility and off-road capability, but many owners quickly realize that the base factory halogen lights leave a lot to be desired on dark trails.

Whether you’re looking to upgrade to LEDs or just need to replace a burnt-out bulb, getting the right fitment is crucial. Below is the comprehensive bulb size guide for the 2020 Jeep Gladiator, along with expert tips on replacement and upgrades.

Quick Reference: 2020 Jeep Gladiator Bulb Sizes

Note: The sizes below apply to Gladiators equipped with standard factory halogen housings. If your Gladiator has the factory Premium LED Lighting Group, those units are sealed and do not use replaceable bulbs.

*Note on Fog Lights: Models with the 3-piece steel Rubicon bumper may use a different fog light housing. Always verify your bumper type before purchasing.

Trim Level Differences: Halogen vs. Factory LED

When ordering replacement bulbs for a 2020 Gladiator, you must first identify your lighting package. The Sport and standard Overland/Rubicon trims often come with halogen reflectors. However, Jeep offered a Premium LED Lighting Group as an option (and standard on certain high-end trims like the High Altitude).

If you have the factory LED package, the headlights, fog lights, fender DRL/turn signals, and taillights are fully sealed assemblies. You cannot replace individual bulbs in these units; if a light fails, the entire housing must be replaced.

LED vs. Halogen Upgrade Considerations

If you have the base halogen lights and want to upgrade to aftermarket LEDs, the Jeep Gladiator’s electrical system requires some specific workarounds:

• CANBUS System Sensitivity: The Gladiator uses a complex CAN (Controller Area Network) bus system that monitors electrical draw. Because LEDs draw significantly less power than halogens, the computer will often think the bulb is burnt out.
• Hyperflashing & Flickering: Dropping standard LEDs into your turn signals or headlights will almost always result in hyperflashing (rapid blinking) or headlight flickering.
• Anti-Flicker Harnesses / Resistors: To fix this, you must install CANBUS decoders (anti-flicker harnesses) inline with your LED headlights. For turn signals, load resistors are required. Alternatively, some high-quality LED kits have built-in CANBUS decoders designed specifically for the JL/JT platform.
• Reprogramming: You can also use a Tazer JL Mini or a professional scan tool to reprogram the vehicle's computer, telling it that LEDs are installed, which often bypasses the need for physical resistors.

How to Replace Key Bulbs

Replacing bulbs on the Gladiator is generally straightforward, but it has a few Jeep-specific quirks.

• Headlights (H13): You cannot simply reach behind the headlight housing to swap the bulb. You need to pop off the front grille. Don't worry—it’s held on by six plastic pop-clips at the top and a few retainer clips at the bottom. Once the grille is off, remove the three 10mm bolts holding the headlight assembly to access the bulb.
• Fog Lights (PSX24W): Access these from under the front bumper. Turning the wheels all the way to one side or removing the plastic splash shield makes reaching the back of the bumper much easier.
• Fender Lights (DRL/Turn Signal - 7443): These are housed in the front fenders. You will need to remove a few plastic rivets from the inner fender liner to pull it back and access the bulb sockets.
• Tail Lights (3157): Drop the tailgate and locate the two 8mm bolts on the inner edge of the taillight housing. Remove them, pull the housing straight back, and twist out the bulb sockets.

Common Lighting Issues for this Generation

The 2020 Jeep Gladiator is relatively reliable, but owners frequently report a few lighting-related quirks:

1. Moisture in the Housings: Condensation in the factory halogen turn signals (and sometimes headlights) is a common complaint. If the water pools, the housing needs replacement.
2. Aftermarket LED Failure: Cheap aftermarket LED bulbs tend to burn out prematurely in the enclosed factory housings due to poor heat dissipation. Always invest in quality LED bulbs with good heat sinks or fans.
3. Fender Light Wiring: The wiring harness for the front fender lights is known to get stretched or damaged if the Jeep is taken off-road frequently and the inner fender liners are altered.

Upgrading your Gladiator's lighting can transform your nighttime driving experience, provided you use the right sizes and address the CANBUS requirements. If you’re dealing with stubborn wiring issues or need professional help installing an aftermarket LED setup, don't guess—find a trusted shop on Repairius.