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LED Sidemarkers For 2020-2023 GMC Sierra HD 2500/3500 (Set)

Original price $263.95 - Original price $263.95
Original price
$263.95 - $263.95
Current price $263.95
  • Description
  • Installation
  • Video


  • Plug-and-play replacement for 2020-2023 GMC Sierra HD fender lights
  • Dynamic startup sequence with animated effect
  • Fully-illuminated housing, with dual-lens design for an even glow
  • Optional Sequential turn signal feature, with plug-and-play wiring harness
  • OEM-grade construction and perfect fitment
  • Engineered and assembled in USA


Upgraded Styling. If you're looking to give your GMC Sierra 2500/3500 an upgrade in styling and appearance, this is the perfect way to do it! These LED sidemarkers are a plug-and-play replacement for the factory fender lights, illuminating the entire width of the housing for a distinctive look and brighter appearance. Choose from three lens color options to get the look you're after.

GMC Sierra Sidemarker Functions

Unique Startup. Both the standard and sequential models feature a unique startup sequence. Every time the sidemarkers turn on, they illuminate in an intense amber color starting from the center then spreading to either side. Once they are completely illuminated, they gradually return to a running light mode.

Sequencing Turn Signal. Our sequential option provides an upgrade in functionality. Anytime you hit your turn signal, the sidemarkers illuminate in a sequencing amber pattern to indicate signaling! The sequential option uses the included plug-and-play harness to power the fender lights using the headlight connector.

OEM Grade. Unlike other sidemarkers on the market, these sidemarkers were designed for OEM standards of quality, using automotive-grade plastic materials, UV-stable lenses, and quality connectors. The dual-lens design uses an inner diffusing lens combined with an outer lens, for an even, uniform glow. The units themselves are designed directly from original CAD data for a perfect fit, and use OEM-grade connectors that plug right into the factory socket.

Reliability. These LEDs are designed with newer constant-current circuitry and transient voltage protection. These features, found in factory-installed lighting components, protect the circuit over time, ensuring years of flicker-free performance. They also include a breather vent, to prevent pressure buildup and maintain a strong weathertight seal for years to come.

Experience. After over a decade in business, Diode Dynamics is the most trusted name in automotive LED lighting. Unlike all other LED distributors, we assemble and engineer products in the United States, for high quality and fast time-to-market of the newest and brightest LED technologies. We pride ourselves in offering only quality LED products, that will exceed your expectations. Please contact us if you'd like to discuss your lighting project!


All sidemarkers illuminate in bright amber color, but there are three colors of lenses. Choose the one that fits your style!

Amber: Also called OEM, these match your original fender lights, and are DOT/SAE compliant in both illumination and lens color.

Smoked: A dark, blacked-out appearance that blends nicely with the factory fender. (May not meet compliance requirements in your region.)

Clear: These are clear in color, but still have the retroreflector optics. (May not meet compliance requirements in your region.)

In the Box:



  • Four (4) replacement sidemarkers
  • Two (2) wiring harnesses
  • Ten (10) fender clips
  • Four (4) rubber plugs
Quantity: Full Set (Four total)
Warranty: 3 year warranty
Return Policy: 30-day Return with no restocking fee
100% Satisfaction Guarantee


NOTE: The sequential option is not compatible with the 2023 Denali Ultimate and AT4 HD trim levels.

Application: Sidemarker
Make: GMC
Model: Sierra 2500 HD
Years: 2020, 2021, 2022, 2023
Electrical Compatibility: No electrical issues (tested and confirmed)

Measured Lumens: 30 lm
Power (watts): 1.3
Operating Voltage: 9-16V
Current (amps @ 12.8V): 0.95
Operating Temperature: -40C to 85C (-40F to 185F)
LED Emitter: Mini SMD
Connector(s): OEM-Size Plug and Play
Driver Features: Internal, Constant Current
Materials: ABS Base, PMMA Lens
Compliance Ratings: SAE J575 Durability Test
Application: Sidemarker
Make: GMC
Model: Sierra 2500 HD
Years: 2020, 2021, 2022, 2023
Electrical Compatibility: No electrical issues (tested and confirmed)
100% Satisfaction Guarantee

During installation, you must remove the factory fender liner, which is held in place using plastic clips. We found that some of these might break when removed, so we've included ten (10) extra clips, just in case! If you need more than 10 replacement clips, they are available to purchase here.

Installation Time: 20-30 minutes

Tools Needed: Basic Toolset

Modification: None

Installation Guide: Click to download

3 Year Replacement Limited Warranty

All Diode Dynamics products come with a 3 Year Worry-Free Warranty.

If you experience any defect with a product, we will do some quick troubleshooting, and if necessary, provide a replacement. There is no need to wait for a return and repair process. Click here to learn more.

Download installation guide for LED Sidemarkers For 2020-2023 GMC Sierra HD 2500/3500 (Set)


Following Video is for LED Sidemarkers For 2020-2023 GMC Sierra HD 2500/3500 (Set)


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