Diode Dynamics HD LED Halos for 2016-2018 GMC Sierra 1500, Switchback, Part DD2177

Features Computer-designed LED Halos compatible with Sierra 1500 2016-2018 A huge increase in brightness, even in direct sunlight More uniform output, upgrade from segmented factory optics Designed and assembled in the USA Overview Time for an upgrade! From the factory, the Sierra comes with a white C-shaped DRL that from certain angles can look segmented and distorted. Diode Dynamics is excited to release our HD LED Halos compatible with GMC Sierra 2016-2018 that provides a much brighter, more uniform appearance compared to the factory optics. These computer-designed LED Halos are circuit boards that align perfectly behind the factory diffusing reflector. Available in switchback and amber-only, both versions also function as an additional front turn signal for a custom, yet functional look! High output, clean appearance. The application-specific LED halos illuminate in place of the factory LED boards, with a much higher intensity. With our proprietary high-density "HDLED" technology, these modules are populated with over 700 LED chips, which are then coated by a diffusing gel, resulting in a perfectly uniform light when turned on. When it's off, the diffusing gel hides the chips, resulting in a clean, OEM appearance. Wire it up. Wiring instructions are included with your order. You will need to use the included T-tap connectors to connect the drivers to ground, parking signal, DRL, and turn signal on each side. Professional installation is recommended for this product, as the headlights must be opened. What's Included Two (2) application-specific LED Halos Two (2) waterproof drivers Two (2) input wire pigtails with T-taps Installation guide 3-year replacement warranty Diode Dynamics is excited to release our HD LED Halos compatible with GMC Sierra 2016-2018 that provides a much brighter more uniform appearance compared to the factory optics. Included in the box: Two (2) application-specific LED Halos Two (2) waterproof drivers Two (2) input wire pigtails with T-taps Installation guide

• Extremely bright high-density LEDs that are visible even in direct sunlight
• Integrated mounting tabs for easy installation
• Phosphor coating for uniform solid appearance
• Multi-function waterproof PWM drivers
• Made in USA

Brief Description: Upgrade the factory lighting appearance on your 2016-2018 GMC Sierra 1500 with Diode Dynamics HD LED Halos. Part DD2177 uses application-specific circuit boards designed to align behind the factory diffusing reflectors, creating a brighter, smoother, and more uniform light output than the original segmented optics. The switchback function provides a crisp white daytime running light and changes to amber when the turn signal is activated.

Built with Diode Dynamics proprietary high-density LED technology, each halo uses more than 700 LED chips covered by a diffusing gel. This construction produces a clean, solid appearance when illuminated while concealing the individual chips when the lighting is off. The high-output design remains visible in direct sunlight and provides an additional functional front turn signal for a distinctive OEM-style upgrade.

Installation and Fitment: Professional installation is recommended because the headlamps must be opened to install the halos. The included wiring connects each driver to ground, parking signal, daytime running light, and turn signal circuits using the supplied T-tap connectors. This kit fits 2016, 2017, and 2018 GMC Sierra 1500 applications listed for this product. Wiring instructions are included, along with a three-year replacement warranty. The halos are designed and assembled in the USA.

Key Product Specifications & Technical Data:

• Application: 2016-2018 GMC Sierra 1500
• Brand: Diode Dynamics
• Part Number: DD2177
• Lighting Function: White daytime running light with amber switchback turn signal
• LED Technology: High-density LED array with more than 700 LED chips per kit
• Driver Type: Multi-function waterproof PWM drivers
• Construction: Phosphor-coated diffusing gel for uniform illumination
• Origin: Designed and assembled in the USA

What's Included in the Box: Two application-specific LED halos, two waterproof drivers, two input wire pigtails with T-tap connectors, and an installation guide.

Features:

• Bright sunlight-visible output: High-density LEDs provide a substantial increase in brightness compared with factory optics, including improved visibility in direct sunlight.
• Uniform OEM-style appearance: Phosphor-coated diffusing gel conceals individual LED chips and produces a smooth, solid light pattern when illuminated.
• Switchback turn signal function: White halos operate as daytime running lights and switch to amber when the front turn signal is activated.
• Application-specific USA construction: Computer-designed circuit boards include integrated mounting tabs and are designed specifically for 2016-2018 GMC Sierra 1500 headlamps.

Fitments:
2016 GMC Sierra 1500 Base
2016 GMC Sierra 1500 Denali
2016 GMC Sierra 1500 SLE
2016 GMC Sierra 1500 SLT
2017 GMC Sierra 1500 Base
2017 GMC Sierra 1500 Denali
2017 GMC Sierra 1500 SLE
2017 GMC Sierra 1500 SLT
2018 GMC Sierra 1500 Base
2018 GMC Sierra 1500 Denali
2018 GMC Sierra 1500 SLE
2018 GMC Sierra 1500 SLT

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: false
Units Per Sku: 1