2017 GMC Yukon Bulb Sizes (Headlight, Tail, Fog)

As an ASE-certified master technician, I’ve worked on countless full-size SUVs, and the 2017 GMC Yukon is a frequent visitor to the bay for routine lighting maintenance. General Motors equipped the 2017 Yukon with some robust lighting systems, but understanding the differences between trim levels (like the SLE, SLT, and Denali) is crucial before you buy replacement bulbs.

Whether you are looking to replace a burnt-out headlight or upgrade your interior cabin lights to LEDs, this comprehensive guide provides the exact bulb sizes you need for your 2017 GMC Yukon.

Quick Reference: 2017 GMC Yukon Bulb Sizes

Here is the quick reference chart for the 2017 GMC Yukon. Note: Always check your owner's manual or current bulb, as trim levels like the Denali feature factory HID and LED upgrades compared to the base SLE.

LED vs Halogen Upgrade Considerations

Upgrading the 2017 Yukon’s halogen bulbs to LEDs is incredibly popular, especially for the H11 low beams and 9005 high beams. However, these modern SUVs use sophisticated Body Control Modules (BCMs) to monitor electrical draw.

• CANBUS Errors: The Yukon’s BCM expects a specific wattage from halogen bulbs (usually 55W). LEDs draw significantly less power. If you install standard LEDs without a CANBUS decoder, the system may assume the bulb is burnt out, leading to dashboard error messages or hyper-flashing.
• Flickering Issues: If you are upgrading your DRLs or low beams to LED, you may experience flickering due to the vehicle's Pulse Width Modulation (PWM) system. Make sure you purchase LED kits with integrated anti-flicker modules (resistors).
• HID Replacements: If your Yukon (like the Denali) comes with factory D3S HID low beams, you cannot simply swap a halogen or standard LED into it. You must replace it with a compatible D3S HID bulb or a specialized D3S-to-LED conversion kit that plugs into the factory HID ballast.

How to Replace Each Bulb

Here are a few quick tips from the shop floor on how to tackle these replacements:

• Headlights (Low and High Beams): To access the headlight bulbs on the 2017 Yukon, you'll generally need to go through the front wheel wells or remove the airbox/components on the passenger side. Turn the wheel inward, remove the fender liner screws, and peel back the liner to access the dust caps on the back of the headlight housing.
• Fog Lights: These are best accessed from underneath the vehicle. Remove the lower air deflector panel or reach up behind the bumper. A simple counter-clockwise twist releases the H16/5202 bulb.
• Tail, Brake, and Rear Turn Signals: GM equipped the 2017 Yukon with full LED tail light assemblies. If your brake light or rear turn signal fails, you generally cannot replace a single bulb; you must replace the entire tail light housing.
• Reverse Lights: The 921 reverse bulbs are located in the tailgate assembly or lower bumper depending on the exact trim. You can access these by removing the interior tailgate trim panels.
• Interior Dome/Map Lights: Use a plastic trim removal tool (never a metal flathead screwdriver) to gently pry the plastic lenses off to access the 194 or 578 festoon bulbs.

Common Lighting Issues for this Generation

The 2017 Yukon is a fantastic SUV, but it does have a few known lighting quirks:

1. Moisture in Headlight Housings: The seals on the factory projector housings can degrade over time, leading to condensation build-up. If left unchecked, this will short out HID ballasts and halogen bulbs.
2. C-Shape LED DRL Failure: The signature C-shaped LED daytime running lights are prone to burning out in sections. Unfortunately, since they are an integrated non-serviceable LED board, the entire headlight assembly usually needs to be replaced if they fail.
3. Tail Light Assembly Failure: Similar to the DRLs, the LED tail lights on the 2015-2020 generation are known to suffer from water intrusion or cracked solder joints, requiring a full unit replacement.

Don't want to wrestle with fender liners or electrical testing yourself? Find a trusted shop on Repairius to get your GMC Yukon’s lighting fixed right the first time.