2025 Jeep Gladiator Bulb Sizes: The Complete Repairius Guide

Quick reference

The 2025 Jeep Gladiator, like its recent predecessors, offers a mix of lighting technologies, primarily depending on the trim level and selected option packages. Many higher trims and optional lighting groups feature full LED exterior lighting from the factory. Base models typically come equipped with traditional halogen bulbs for headlights and fog lights.

For Low Beam and High Beam headlights, halogen-equipped Gladiators universally use the H13 (9008) bulb. This dual-filament bulb provides both low and high beam functions from a single bulb. If your Gladiator has the Premium LED Lighting Group or is a higher trim, it will feature integrated LED headlamps, meaning the individual bulbs are not replaceable – the entire headlamp assembly would need replacement if the LEDs fail.

Fog Lights also follow a similar pattern. Halogen fog lights typically use an H16 (Type 2) bulb. LED fog lights are integrated into the housing and are not individually replaceable.

Daytime Running Lights (DRLs) can vary. On models with full LED lighting, the DRLs are integrated into the LED headlamp or a dedicated LED strip. On halogen-equipped models, the front turn signal bulb often doubles as the DRL, or there might be no dedicated DRL functionality depending on regional regulations and vehicle configuration.

Front and Rear Turn Signals for both incandescent and some LED applications commonly use the 3157/7440 bulb type. It's crucial to verify if your specific Gladiator uses an incandescent or an integrated LED turn signal for accurate replacement. Some higher trims feature integrated LED turn signals that are not serviceable at the bulb level.

Brake Lights and Tail Lights are often combined on a single dual-filament 3157/7440 bulb for incandescent setups. LED tail lights, found on many trims, are integrated units.

The Reverse Lights typically use a 921 incandescent bulb across most, if not all, trims.

License Plate Lights commonly employ a 194 incandescent bulb.

Front and Rear Side Marker Lights, whether integrated into the headlamp/taillamp assembly or as separate units, often use a W5W/194 type bulb for incandescent versions.

Inside, the Dome Light is frequently a 578/44mm festoon style bulb, while Map Lights (front and rear, if equipped) likely use 194 incandescent bulbs.

LED vs halogen upgrade considerations

Upgrading your 2025 Jeep Gladiator from halogen to aftermarket LED bulbs requires careful consideration to avoid common issues. While LEDs offer brighter light, longer lifespan, and a more modern appearance, the Gladiator's sophisticated electrical system can present challenges.

CANBUS Errors: Modern vehicles like the Gladiator use a Controller Area Network Bus (CANBUS) system to monitor electrical components. Halogen bulbs draw more power than LEDs. When you install an LED, the lower power draw can be misinterpreted by the CANBUS system as a "bulb out" error, triggering dashboard warning lights (e.g., "Check Headlights" or "Turn Signal Malfunction") or causing hyper-flashing for turn signals. To circumvent this, you'll typically need CANBUS-compatible LED bulbs or load resistors (decoders). Load resistors mimic the power draw of a halogen bulb, tricking the CANBUS system into thinking everything is normal. Be aware that load resistors generate heat and should be mounted carefully away from plastics or wiring.

Adapters Needed: For headlights, some aftermarket LED bulbs may come with specific retainers or require adapters to properly seat them in the Gladiator's headlamp housing, especially for the H13 type. Ensure any kit you purchase specifies compatibility with the 2025 Gladiator.

Flicker Issues: Without proper CANBUS decoders, some aftermarket LEDs might flicker, especially when the engine is off or during startup. This is another symptom of the vehicle's electronics trying to communicate with a bulb that's drawing unexpected power.

Beam Pattern: Not all LED "replacement" bulbs are created equal. Poorly designed LEDs in a housing designed for halogen bulbs can result in a scattered light pattern, blinding oncoming drivers, and providing less effective illumination than the original halogens. Look for LEDs specifically designed to replicate the filament placement of the original halogen bulb to maintain a proper beam pattern.

How to replace each bulb

Replacing bulbs on your Gladiator generally involves basic hand tools and patience. Always consult your owner's manual for the most accurate and up-to-date instructions for your specific trim.

Headlights (H13 Halogen): Access is usually from behind the lamp assembly once you open the hood. You'll typically unclip or twist to remove the connector, then unseat the bulb. Be careful not to touch the glass of the new halogen bulb with bare hands.

Fog Lights (H16 Halogen): Access is usually from underneath the front bumper or by removing fender liner screws. The bulb often twists out from the housing.

Front Turn Signals/DRLs (if applicable): Accessible from the fender well by partially removing the inner fender liner or from behind the headlamp assembly.

Rear Turn Signals, Brake Lights, Tail Lights, Reverse Lights: For the rear lights, you'll typically need to open the tailgate and remove a few screws holding the entire taillight assembly in place. Once the assembly is out, the individual bulb sockets twist to remove, allowing bulb replacement.

License Plate Lights: Usually accessed by removing a couple of screws holding the lens cover in place above the license plate.

Side Marker Lights: May be integrated into larger assemblies or have a small lens to pop off with a trim tool.

Dome/Map Lights: Carefully pry open the clear plastic lens cover using a plastic trim tool to avoid damage. The bulbs often simply pull out.

Common lighting issues for this generation

While the 2025 Jeep Gladiator is a new model, it shares many lighting components and electrical architecture with previous JK/JL Wrangler and Gladiator generations. Common issues observed in these platforms that may carry over include:

• Condensation in Headlight/Taillight Housings: Despite being sealed units, some owners report minor condensation inside headlight or taillight assemblies, especially after heavy rain or car washes. This is often described as "normal" by manufacturers if it dissipates quickly, but persistent water ingress could indicate a faulty seal.
• Flickering Aftermarket LEDs: As discussed, improper aftermarket LED installations without CANBUS decoders are a frequent source of flickering lights or "bulb out" warnings.
• DRL Malfunctions: Issues with DRL functionality, particularly when integrating aftermarket lighting, can occur due to electrical incompatibilities.
• Corrosion in Sockets: Over time, exposure to elements can lead to corrosion in bulb sockets, particularly for exterior lights, causing intermittent operation. This is less common on newer vehicles but something to be aware of if issues arise later in the vehicle's life.
• Integrated LED Failure: While rare, if an integrated LED headlamp or taillamp module fails, it often requires replacing the entire, more expensive assembly rather than just a simple bulb.

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