What Size Bulbs Does a 2020 GMC Sierra 3500 HD Use?
Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.
Installation Difficulty
Moderate (Dust covers often present)
Est. Replacement Cost
$15 - $40 (Halogen) / $30+ (LED)
What Lighting System Does the 2020 GMC Sierra 3500 HD Have?
Owners of the 2020 GMC Sierra 3500 HD will find a total of 7 lighting elements throughout the vehicle's exterior. It features a standard lighting system powered by a dual-bulb halogen configuration using separate low beam and high beam bulbs for precise light distribution.
Can You Put LED Bulbs in a 2020 GMC Sierra 3500 HD?
For a GMC built for the road and trail, LED upgrades provide the high-contrast lighting needed for better obstacle detection. We recommend starting your upgrade with the low beams, as they see the most use. Adding a matching LED kit later will complete the look and ensure consistent lighting performance.
2020 GMC Sierra 3500 HD Bulb Size Chart
| Position | Bulb Size | Shop |
|---|---|---|
| Turn Signal Front | 7443 | Buy 7443 → |
| Parking Light | 7443 | Buy 7443 → |
| Side Marker | 7443 | Buy 7443 → |
| Turn Signal Rear | 7443 | Buy 7443 → |
| Tail Light | 7443 | Buy 7443 → |
| Reverse Light | 921 | Buy 921 → |
| Brake Light | 921 | Buy 921 → |
How do the 2020 GMC Sierra 3500 HD's bulbs compare to other years?
The 2020 GMC Sierra 3500 HD changed bulb sizes from 2019. The previous model year used a different configuration.
This bulb configuration covers the 2020 model years. ← 2019
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