2018 Honda Odyssey Bulb Sizes

Quick reference

The 2018 Honda Odyssey, a popular choice for families, comes with a variety of lighting configurations depending on the trim level. While most trims feature traditional halogen lighting for the majority of exterior and interior functions, it's important to note potential variations, especially concerning headlights and brake/tail lights.

For instance, the top-tier Touring and Elite trims of the 2018 Odyssey were equipped with full LED headlights from the factory, meaning there isn't a replaceable bulb for the low or high beam in these specific configurations. If your Odyssey has very bright, white headlights that don't seem to have a filament, you likely have the OEM LED setup. Always verify your trim level and existing bulb type before purchasing replacements or upgrades.

LED vs halogen upgrade considerations

Upgrading your 2018 Honda Odyssey's halogen bulbs to LED can offer significant benefits, including brighter light, a whiter color temperature, and a longer lifespan. However, there are several factors to consider before making the switch:

• CANBUS Errors: Modern vehicles like the 2018 Odyssey utilize a CANBUS (Controller Area Network Bus) system to monitor various electrical components, including lighting. LED bulbs draw less power than their halogen counterparts, which can sometimes trigger "bulb out" warnings or flickering on your dashboard. To circumvent these issues, you'll often need to use LED bulbs with built-in CANBUS decoders or install external load resistors. Without these, your vehicle's computer may detect the lower power draw and believe the bulb is faulty.
• Adapters and Fitment: While many aftermarket LED bulbs are designed to be "plug-and-play," some applications may require specific adapters to properly seat the LED bulb in the housing or to connect it to the vehicle's wiring harness. headlight dust caps may also need modification or replacement if the LED bulb's cooling fan or heatsink extends too far. Always check the product specifications and any included instructions carefully.
• Beam Pattern (Headlights and Fog Lights): When upgrading low beam, high beam, or fog lights to LED, ensure the chosen bulbs are designed to properly project light in your Odyssey's reflector or projector housings. Poorly designed LED bulbs can create glare for oncoming drivers or result in a scattered, ineffective beam pattern. Look for LEDs that mimic the filament placement of the original halogen bulb.

How to replace each bulb

Replacing bulbs on your 2018 Honda Odyssey is generally a straightforward process, though some locations are more accessible than others. Always ensure the vehicle is turned off and the relevant lighting circuit is de-energized before beginning work.

• Low Beam Headlight (Halogen): Access is typically from behind the headlight assembly in the engine bay. Twist and remove the dust cap, then unclip the bulb and disconnect the electrical connector.
• High Beam Headlight: Similar to the low beam, access from the engine bay. Twist to unlock, then pull out and disconnect.
• Fog Light: Often requires access from underneath the vehicle or by partially removing the fender liner. Twist the bulb counter-clockwise to remove.
• DRL (Daytime Running Light): Usually accessed from the engine bay, often near the high beam or within the headlight housing.
• Front Turn Signal: Accessed from inside the engine bay. Twist the socket counter-clockwise to remove the entire assembly, then pull the bulb straight out.
• Rear Turn Signal, Brake, Tail, Reverse: Access these bulbs by opening the tailgate and removing the interior trim panel covering the tail light assembly. Once the panel is off, you'll typically see twist-lock sockets for each bulb. Twist the desired socket counter-clockwise and pull it out, then replace the bulb.
• License Plate: Typically accessed by removing small screws holding the clear lens in place, often found above the license plate itself.
• Side Marker (Front/Rear): Usually accessed from inside the wheel well by removing a few clips or screws from the fender liner, or in some cases, by simply twisting the entire assembly from the exterior.
• Dome/Map Lights: Gently pry off the clear lens cover with a plastic trim tool. The bulbs are usually push-in types that can be carefully pulled out.

Common lighting issues for this generation

Owners of the 2018 Honda Odyssey may occasionally encounter a few common lighting-related issues:

• Premature Halogen Bulb Failure: While not unique to the Odyssey, halogen bulbs can sometimes burn out earlier than expected, especially if handled with bare hands (oils from your skin can create hot spots). This is a simple replacement.
• Flickering or Intermittent Lights (after LED upgrade): As mentioned, this is almost always due to CANBUS incompatibility. Installing appropriate load resistors or CANBUS-ready LED bulbs will resolve this.
• Tail Light Condensation: Some owners have reported minor condensation inside the tail light assemblies. If excessive, this can lead to corrosion and bulb failure. Usually, this requires replacing the entire tail light unit.
• Daytime Running Light Malfunction: Issues with DRLs can sometimes be related to either a faulty bulb or, less commonly, an electrical issue with the DRL module. Start by checking the bulb.

Find a trusted shop on Repairius.