2025 Toyota Tundra Bulb Sizes

Quick Reference

The 2025 Toyota Tundra continues its legacy as a formidable contender in the full-size truck market, and its lighting system showcases a blend of advanced LED technology and traditional incandescent bulbs, depending on the trim level and specific light function. It's crucial to understand these variations, especially if you're considering upgrades or replacements.

Most 2025 Tundra models, particularly higher trim levels, will come standard with full LED headlights, including both low and high beam functions. These integrated LED units are not designed for bulb replacement; if a component fails, the entire housing may need to be replaced. Some base models may still utilize halogen bulbs for certain functions, but this is becoming increasingly rare in modern vehicles.

Fog lights can vary. Many Tundra trims will feature LED fog lights directly from the factory, offering excellent illumination. However, some configurations might still use an H11 halogen bulb, providing an opportunity for an easy upgrade to brighter LED options.

Daytime Running Lights (DRLs) are almost universally LED on the 2025 Tundra, often integrated into the headlight assembly, providing a distinct factory look and enhanced visibility.

Front and rear turn signals can be a mix. Higher trims often boast LED turn signals, offering instant illumination and a modern aesthetic. However, many Tundras, even in higher trims, might still employ an incandescent 7440A bulb for the turn signals. This is a common area for owners to upgrade to LED bulbs for a quicker flash and brighter output.

Brake lights and tail lights are predominantly LED across the Tundra lineup, providing superior visibility and a longer lifespan compared to traditional incandescent bulbs. These are typically integrated into the tail light assembly and are not user-replaceable bulbs.

Reverse lights often utilize a 921 incandescent bulb, though some premium trims may feature LED reverse lights. This is another popular spot for an LED upgrade to significantly improve rearward visibility when backing up.

License plate lights typically use a 194 incandescent bulb, offering a simple and effective solution. LED options are available as aftermarket replacements for a brighter, whiter light.

Side marker lights are generally 194 incandescent bulbs for the front, while rear side markers are frequently integrated LEDs within the tail light assembly.

Inside the cabin, dome and map lights often remain traditional. The dome light usually takes a 31mm festoon bulb, and the map lights commonly use a 194 bulb. These are straightforward to replace and offer an easy way to customize the interior lighting with brighter or colored LED alternatives.

LED vs Halogen Upgrade Considerations

Upgrading your 2025 Toyota Tundra from halogen to LED bulbs can bring numerous benefits, including increased brightness, a whiter light, improved longevity, and a modern aesthetic. However, there are several considerations to keep in mind:

• CANBUS Errors: Modern vehicles like the Tundra use a sophisticated CANBUS (Controller Area Network Bus) system to monitor electrical components. Halogen bulbs draw more power than LEDs. When you replace a halogen with an LED, the lower power draw can be misinterpreted by the CANBUS system as a