2020 GMC Acadia Bulb Size Guide

Quick Reference: 2020 GMC Acadia Bulb Sizes

Your 2020 GMC Acadia, a versatile and popular SUV, relies on a variety of bulbs for optimal visibility and safety. Understanding the specific bulb sizes for each lighting component is essential for maintenance, replacement, and potential upgrades. This guide breaks down the bulb types for common lighting locations, noting differences between halogen and OEM LED configurations often found across different trim levels.

For the 2020 Acadia, General Motors offered a mix of lighting technologies depending on the trim level. Lower trims typically came equipped with halogen bulbs for most exterior lighting, while higher trims, such as the Denali or specific option packages, featured full LED headlights, DRLs, and sometimes LED front turn signals. It's crucial to verify your Acadia's specific lighting configuration before purchasing replacement bulbs.

Headlights

Low Beam: Many 2020 Acadia models use an H11 halogen bulb for the low beams. However, higher trim levels or those with optional lighting packages often come with integrated LED low beams from the factory. If your Acadia has a projector-style headlight housing, it is more likely to be an LED setup.

High Beam: Similar to the low beams, the high beams in halogen-equipped Acadia models typically utilize a 9005 bulb. LED high beams are also integrated into the full LED headlight assemblies found on some trims.

Fog Lights: The fog lights on the 2020 Acadia generally use an H11 halogen bulb across all trim levels, even those with LED headlights. These are designed to provide supplemental lighting in adverse weather conditions.

Daytime Running Lights (DRL): The DRLs can vary significantly. Halogen-equipped Acadias often use a 2825 bulb, while models with LED headlights will have integrated LED DRL strips, providing a distinct light signature.

Turn Signals

Front Turn Signals: For Acadia models with traditional halogen lighting, the front turn signals typically take a 7440A bulb (amber). If your Acadia has LED headlights, the front turn signals may also be integrated LED units.

Rear Turn Signals: The rear turn signals consistently use a 7440 bulb, regardless of the front lighting setup.

Brake, Tail, and Reverse Lights

Brake Light: The brake lights on your Acadia use a 7443 bulb, which is a dual-filament bulb capable of handling both brake and tail light functions.

Tail Light: Also utilizing the 7443 bulb, the tail lights provide constant illumination when your headlights are on.

Reverse Light: For backing up, the 2020 Acadia typically uses a 921 bulb for its reverse lights.

Other Exterior Lights

License Plate Light: The license plate is illuminated by a 194 bulb.

Side Marker Light: The side marker lights commonly use a WY5W bulb, which is an amber wedge-base bulb.

Interior Lighting

Dome Light: The interior dome lights can vary slightly by trim and specific location within the cabin. Common sizes include 578, 212-2, and 194 bulbs. It's best to visually inspect or check your owner's manual for the exact bulb type for each dome light location.

Map Light: Front map lights often use a 194 bulb, while rear map lights may use a 578 bulb.

LED vs Halogen Upgrade Considerations

Upgrading your Acadia's halogen bulbs to LED can offer numerous benefits, including brighter illumination, longer lifespan, and a more modern appearance. However, there are important considerations:

• CANBUS Errors: Modern vehicles like the 2020 Acadia use a CANBUS (Controller Area Network Bus) system to monitor electrical components. LED bulbs draw less power than halogens, which can sometimes trigger "bulb out" warnings or flickering due to CANBUS error detection. To prevent this, you may need to install CANBUS-compatible LED bulbs or load resistors.
• Adapters and Fitment: Aftermarket LED bulbs can sometimes be larger than their halogen counterparts, requiring more space in the housing. Ensure the LED bulbs you choose are designed to fit your Acadia's specific light housings without modification.
• Beam Pattern: For headlights, especially in reflector housings (if applicable), poorly designed LED bulbs can scatter light, creating glare for oncoming drivers and reducing your effective visibility. Choose high-quality LED replacements from reputable brands that mimic the halogen filament