2020 Toyota Tundra Bulb Sizes (Headlight, Tail, Fog)

As an ASE-certified master technician, I know that maintaining the lighting on your truck is critical for safety, visibility, and aesthetics. The 2020 Toyota Tundra is a robust workhorse, but its lighting system varies significantly depending on your trim level. While higher trims (like the Limited, TRD Pro, Platinum, and 1794 Edition) often come equipped with full factory LED headlights and fog lights, the base SR and SR5 trims largely rely on traditional halogen bulbs.

Whether you're looking to upgrade your SR5 to LEDs or simply need to replace a burnt-out tail light, this comprehensive guide covers everything you need to know about the 2020 Toyota Tundra's bulb sizes.

Quick Reference: 2020 Toyota Tundra Bulb Sizes

Here is the quick reference chart for the 2020 Toyota Tundra. Note: If your Tundra came with factory LED headlights or tail lights, those units do not have replaceable bulbs; the entire assembly must be replaced if a failure occurs.

LED vs Halogen Upgrade Considerations

Upgrading the halogen bulbs on a 2020 Toyota Tundra SR or SR5 to aftermarket LEDs is incredibly popular, but it requires some planning:

• CANBUS Systems and Hyper-Flashing: The Tundra's electrical system monitors bulb resistance. Because LEDs draw significantly less power than halogens, installing LED turn signals will cause "hyper-flashing" (the blinker flashing twice as fast). To fix this, you will need to install in-line load resistors or purchase LED bulbs with built-in CANBUS anti-flicker/anti-hyper-flash technology.
• Headlight Housing Glare: The halogen H4 (9003) bulb acts as both your high and low beam in lower trims. When putting an aftermarket LED bulb into a housing designed for a halogen reflector, aim is critical. Ensure the LED diodes are oriented at 3 o'clock and 9 o'clock to mimic the original filament pattern and avoid blinding oncoming traffic.
• Factory LED Trims: If you own a TRD Pro or Platinum with factory LEDs, you cannot just "swap a bulb" if a headlight goes out. You will need a complete OEM headlight assembly replacement.

How to Replace Each Bulb

• Headlights (Low/High Beam): The Tundra offers excellent access under the hood. Simply unclip the wiring harness from the back of the H4 bulb, pull off the rubber dust boot, unlatch the metal retaining spring, and pull the bulb out. Do not touch the new halogen glass with your bare fingers!
• Fog Lights: These are best accessed from under the front bumper or by partially pulling back the front wheel well liner. The H16 bulb twists counterclockwise to unlock.
• Front Turn Signals & DRLs: Located right next to the headlight bulbs under the hood. They sit in a twist-lock socket. Quarter-turn counterclockwise to remove.
• Tail, Brake, and Rear Turn Signals: Drop the tailgate and remove the two 10mm bolts or T-30 Torx screws securing the tail light assembly to the bed. Pull the housing straight back toward you (do not pry sideways, or you'll break the alignment pins).
• Reverse Lights: Located within the tail light housing. Use the same removal process as above and swap out the 921 wedge bulb.
• License Plate Lights: Reach up behind the rear bumper, locate the socket, twist counterclockwise, and pull it down to replace the 194 bulb.
• Interior Dome/Map Lights: Carefully use a plastic trim removal tool to pop the clear plastic lenses off. The map lights pull straight out, while the rear dome light is a festoon style (spring-loaded) that simply pops out.

Common Lighting Issues for this Generation

The 2014-2021 Tundra generation is highly reliable, but lighting quirks do exist. The most common issue is moisture intrusion in aftermarket or modified OEM headlight housings. If you open up the dust caps to install LED H4 bulbs and do not seal them properly, condensation will build up inside the lens.

Additionally, owners of higher trims sometimes report daytime running light (DRL) LED strips dimming or burning out prematurely. Because these are integrated into the headlight, it requires an expensive assembly replacement, which is why checking for warranty coverage is highly recommended.

If you are dealing with complex electrical issues, broken factory LED assemblies, or need a professional to properly aim your newly installed LED headlights, don't leave it to chance. Find a trusted shop on Repairius.