2020 Chevrolet Silverado 3500HD Bulb Sizes

Quick Reference

The 2020 Chevrolet Silverado 3500HD offers various lighting configurations depending on the trim level, primarily distinguishing between models equipped with halogen headlights and those with factory LED lighting. It's crucial to identify which system your truck has before purchasing replacement or upgrade bulbs.

Lower trim levels (e.g., WT, Custom) typically come with traditional halogen reflector headlight housings. In these models, the low beam uses an H11 bulb, and the high beam uses a 9005 bulb. The fog lights, if equipped, also commonly use an H11 bulb. Daytime Running Lights (DRLs) in halogen setups often utilize a 7443 incandescent bulb, sometimes integrated with the front turn signal function.

Higher trim levels (e.g., LTZ, High Country) and certain option packages often feature factory-installed LED headlight systems. For these trucks, the low beams, high beams, and DRLs are integrated LED units, meaning individual bulbs cannot be replaced. If a component of an integrated LED headlight fails, the entire headlight assembly typically needs to be replaced. These factory LED systems provide superior light output and a distinct appearance compared to their halogen counterparts.

Front turn signals in halogen configurations commonly use a WY21W (amber 7440/7443 type) bulb. The rear turn signals, brake lights, and tail lights often share a dual-filament 3157 or a 7443 incandescent bulb, differentiating between brake/turn and tail light functions depending on the wiring and socket. The reverse lights generally use a 921 bulb. License plate lights and side marker lights (both front and rear) typically use a smaller 194 wedge bulb.

Interior lighting can vary. Many dome and map lights in the 2020 Silverado 3500HD still use traditional 194 or W5W wedge bulbs for versatility, though some premium trims may incorporate factory LED interior lighting.

LED vs Halogen Upgrade Considerations

Upgrading your 2020 Chevrolet Silverado 3500HD from halogen to LED bulbs can significantly improve light output and modernize the look of your truck. However, there are important considerations to keep in mind:

CANBUS Errors: Modern vehicles like the 2020 Silverado 3500HD use a CANBUS (Controller Area Network Bus) system to monitor electrical components, including lighting. LED bulbs draw significantly less power than halogen bulbs. When you replace a halogen bulb with an LED, the lower power draw can be misinterpreted by the CANBUS system as a