2018 Toyota Tacoma Bulb Size & LED Upgrade Guide

Quick reference

The 2018 Toyota Tacoma is a popular mid-size truck known for its reliability and off-road capability. When it comes to lighting, most 2018 Tacomas came equipped with traditional halogen bulbs from the factory. However, some higher trim levels and specific packages, particularly in the SR5 and TRD lines, began to feature OEM LED low beams and/or integrated LED DRL strips, offering brighter and more efficient lighting. It's important to check your specific trim and package to confirm your original equipment, especially for the low beam headlights.

LED vs Halogen Upgrade Considerations

Upgrading your 2018 Toyota Tacoma's halogen bulbs to LED can significantly improve visibility and give your truck a more modern look. However, there are a few important considerations:

• CANBUS Errors: The 2018 Tacoma's electrical system can sometimes detect the lower power draw of LED bulbs as a "bulb out" error, leading to hyperflashing turn signals or dashboard warning lights. For most exterior bulbs, especially turn signals, you will likely need to install CANBUS-compatible LED bulbs or load resistors to prevent these issues. Load resistors mimic the power draw of incandescent bulbs, tricking the vehicle's computer.
• Headlight Housing: While many LED conversion kits fit directly into the Tacoma's headlight housing, some may require slight modification or specific adapter collars to ensure proper seating and beam pattern. Incorrectly installed LEDs in a reflector housing can create excessive glare for oncoming drivers.
• Flickering: Cheaper LED bulbs or those without proper voltage regulation may flicker. Opt for reputable brands for reliable performance.
• DRL Functionality: If your Tacoma uses the H11 low beam bulb for DRLs, some LED low beam conversions may not function correctly as DRLs without additional wiring or a dedicated DRL module, as DRLs often operate at a lower voltage.

How to Replace Each Bulb

Replacing bulbs on your 2018 Tacoma is generally a straightforward process, often requiring basic hand tools.

• Headlights (Low/High Beam): Access is typically from behind the headlight assembly in the engine bay. You may need to remove a plastic cover or air intake tube for better reach. Twist the bulb counter-clockwise to remove.
• Fog Lights: Access is usually from underneath the front bumper, or by removing the inner fender liner. A Phillips head screwdriver or 10mm socket may be needed.
• Front Turn Signals/DRL: Often accessible by reaching behind the front bumper or through the wheel well liner.
• Rear Turn Signals/Brake/Tail/Reverse Lights: These are all accessed by removing the two screws holding the taillight assembly in place (typically Phillips head) and gently pulling the assembly straight back. Once out, twist the bulb sockets to remove them.
• License Plate Lights: Usually accessed by unscrewing small covers above the license plate (Phillips head).
• Front Side Markers: These are integrated into the headlight assembly; replacement typically involves accessing from behind the headlight.
• Dome Light: Carefully pry off the lens cover with a plastic trim tool or small flathead screwdriver. The festoon bulb simply unclips.
• Map Lights: Carefully pry off the lens cover with a plastic trim tool or small flathead screwdriver. The 194 bulbs twist out of their sockets.

Common Lighting Issues for this Generation

Owners of the 2018 Toyota Tacoma occasionally report a few lighting-related quirks or issues:

• DRL Glare (with Halogen Low Beams): When the H11 low beam acts as a DRL at reduced power, some owners feel they are not bright enough, or conversely, cause too much glare if they are on a higher setting than desired. This is largely a design characteristic.
• Headlight Condensation: While not a bulb issue, some owners have reported condensation inside the headlight assemblies, which can obscure light output. This is often covered under warranty if it's a manufacturing defect.
• Flickering After LED Upgrade: As mentioned above, flickering in upgraded LED bulbs is almost always due to incompatible CANBUS systems or insufficient power regulation in the chosen LED bulbs. Ensure you use quality LEDs with built-in resistors or add external load resistors.
• Bulb Lifespan: While generally reliable, some owners occasionally report shorter-than-expected lifespan for certain exterior incandescent bulbs, especially brake and turn signals. This can be exacerbated by rough terrain or vibrations.

Find a trusted shop on Repairius.