2019 GMC Sierra 1500 Bulb Sizes

Quick Reference

The 2019 GMC Sierra 1500, a popular choice for truck enthusiasts, offers a range of lighting configurations across its various trim levels. Understanding these differences is key when considering replacements or upgrades. Most base and mid-range trims came equipped with traditional halogen lighting, while higher trims like the SLT, AT4, and Denali often featured advanced LED lighting systems from the factory.

For models with factory LED headlights, the low beam and high beam bulbs are typically integrated LED units within the headlight assembly and are not designed for individual bulb replacement. In these cases, if a component fails, the entire headlight assembly may need replacing. However, for halogen-equipped trucks, the H11 is the common low beam bulb and the 9005 serves as the high beam. The fog lights, regardless of the headlight type, generally utilize an H11 bulb.

Daytime Running Lights (DRLs) on the 2019 Sierra 1500 are predominantly integrated LED strips on higher trims, contributing to the truck's distinctive front-end appearance. For models with halogen headlights, the DRL function might be handled by a lower-intensity operation of the high beam bulb or a separate incandescent bulb depending on the specific package.

Turn signals are generally incandescent across most trims. The front turn signals commonly use a 7444NA amber bulb, while the rear turn signals, brake lights, and tail lights often share a 3057 red bulb. The reverse lights typically utilize a 7440 clear bulb, providing ample illumination when backing up. License plate lights and side marker lights usually take a W5W or 168 wedge-type bulb.

Inside the cabin, the dome light often uses a 578 festoon-style bulb, and the map lights commonly use 194 wedge bulbs. These interior bulbs are great candidates for LED upgrades for a brighter, more modern look.

LED vs Halogen Upgrade Considerations

Upgrading from halogen to LED bulbs in your 2019 GMC Sierra 1500 can significantly improve light output, modernize the look of your truck, and offer greater longevity. However, there are several considerations to keep in mind:

• CANBUS Errors: Modern vehicles, including the Sierra 1500, use a CANBUS (Controller Area Network Bus) system to monitor electrical circuits. LED bulbs draw significantly less power than halogen bulbs, which can sometimes trick the CANBUS system into thinking a bulb is out, triggering a