LED Sidemarkers for 2020-2021 GMC Sierra HD 2500/3500 (set)

Features

Plug-and-play replacement for 2020+ 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
Overview

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!

Options

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.

What's Included

In the Box:
Standard

Four (4) replacement sidemarkers
Ten (10) fender clips
Sequential

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
Fitment

Application: Sidemarker Make: GMC Model: Sierra HD 2500/3500 Years: 2020, 2021 Electrical Compatibility: No electrical issues (tested and confirmed)

What is your shipping cutoff time? 

Cutoff time is 1pm EST. Assuming we have all your parts in stock, the order should ship the same day. If you need a product by a specific date, please call us to find out if its possible to meet your deadline before ordering. Please be aware that there may be discrepancies with shipping calculators or “in stock” status of a product. 

Will I receive a tracking number? 

Of course! As soon as your order is shipped you will receive a tracking notification through email. You can also always log into your account and check the tracking information on the order. 

Is shipping free? 

Orders over $99 qualify for free shipping within the contiguous  United States. *Services are excluded from free shipping. We will chose the most economic method. If you need a product as quickly as possible, always best to chose an expedited shipping option. 

Return Window

We allow up to 90 days from the original purchase date to return your item for an exchange or store credit. If you wish to return the product for a refund, we allow up to 45 days from the original purchase date. 

Shipping 

Customers are responsible for return shipping costs, unless of course we made an error when we shipped out the order. Please contact us if an error was made, we can send over a return label to the email address on file to begin the exchange process. 

Refunds/Store Credit

Please be advised that any free shipping promotions used on the original order will be forfeited if the order is returned and the original shipping costs (paid or unpaid) will also be deducted from the refundable amount.  Refunds can only be processed to the original payment method. Store credit will be sent through an email gift card, which you can apply to your next order with us. 

Our standard restocking fee structure is outlined below. Please refer to our exchange and refund policies for important timelines. 

Tier 1: Perfect condition. (Unopened & like-new) = 90% refund or 100% store credit.
Tier 2: Re-conditionable. (Packaging opened or damaged) = 80% refund or 90% store credit.        
Tier 3: Inability to restock. (Product & packaging both damaged) = 70% refund or 80% store credit. 

Exclusions

If the part has been installed, and shows signs of use, we are unable to take the product back for an exchange or refund. Original Osram and Philips bulbs cannot be returned if the authenticity seal has been broken. Any special ordered item, such as a custom headlight conversion, is not eligible to be returned. 

HID and LED bulbs are street legal in the USA for Fog Light use only. Not compliant with DOT / FMVSS108 and not street legal in the USA for Headlights. Legal for off-road use in Snowmobile and ATV headlights and off-road racing use only auxiliary or forward lighting. International street legality varies by country. 

Note: This usage regulation is not unique to products found on our website. All LED and HID bulbs from all other brands, regardless of marketing claims, are prohibited from street use in halogen headlights in the USA. To find street legal LED headlight assemblies, click HERE.