The 2019-2023 GMC Sierra came with either factory halogen or factory LED tail lights, depending on trim and equipment. Many owners with halogen trucks want the LED tail lights for the updated look.
Can you install LED tail lights on a 2019-2023 GMC Sierra that came with halogen tail lights? Yes. But swapping the tail lights alone is not enough. The LED tail lights fit the truck, but the factory wiring is different. A conversion harness adapts the factory wiring so the LED tail lights work without cutting or splicing.
TAILLIGHTS NOT INCLUDED. The harness kit is one left and one right harness only.
Quick Answer
- Halogen and LED tail lights on this truck use different wiring.
- A plug and play harness connects the factory halogen wiring to the LED tail lights.
- Each harness has integrated load resistors to help prevent hyperflash.
- It fits trucks that came with factory halogen tail lights only.
- KVS sells this harness: 2019-2023 GMC Sierra Halogen to LED Tail Light Conversion Pigtail Harness.
Why Aren't LED Tail Lights Plug and Play?
The LED tail lights fit the truck, but the electrical systems are different. The connectors may look alike, but the wiring layout and electrical needs are not the same. Without the right harness, the LED tail lights are not designed to work on the halogen wiring.
For a general explanation, see Can I Upgrade My Factory Halogen Taillights to OEM LED Taillights?
What the Conversion Harness Does
The harness connects the factory halogen wiring to the LED tail lights. It is designed to:
- Adapt the factory connectors
- Correct the wiring layout
- Keep the factory wiring intact
- Remove the need for cutting and splicing
Because nothing is cut, the original wiring stays untouched.
Preventing Hyperflash
Hyperflash is when the turn signals blink faster than normal after a switch to LED lighting. Each harness includes integrated load resistors to help prevent hyperflash and let the LED tail lights work properly with the factory wiring. To learn why hyperflash happens, read What Causes Hyperflash After Installing LED Lights?
Only for Factory Halogen Trucks
Check your truck's original tail lights before you order. This harness is only for 2019-2023 GMC Sierra trucks that came with factory halogen tail lights. If your truck already has factory LED tail lights, you do not need it.
Have a 2014-2015 Sierra 1500? That truck uses a different harness. See the 2014-2015 Sierra 1500 Halogen to 2016-2018 OEM LED Tail Light Guide.
Optional Premium Load Resistor Configuration
The standard harness already includes everything needed for proper operation. The optional premium configuration replaces the included standard load resistors with two premium aluminum load resistors.
What This Harness Fits
- 2019 GMC Sierra 1500
- 2020 GMC Sierra
- 2021 GMC Sierra
- 2022 GMC Sierra
- 2023 GMC Sierra
It is for trucks that came with factory halogen tail lights and are being converted to 2019-2023 GMC Sierra LED tail lights. Check the product page for full fitment details.
Before You Order
- Your truck is a 2019-2023 GMC Sierra.
- Your truck came with factory halogen tail lights.
- You are installing 2019-2023 GMC Sierra LED tail lights.
- Your replacement tail lights use the correct connector type.
Not sure? Contact KVS before you order. You can also browse all GMC Sierra parts.
Frequently Asked Questions
Do I need to cut or splice any wires?
No. The harness plugs into the factory connectors.
Will this help prevent hyperflash?
Yes. Each harness includes integrated load resistors to help prevent fast turn signal flashing after the switch to LED tail lights.
Will this work if my Sierra already has factory LED tail lights?
No. It is only for trucks that came with factory halogen tail lights.
Can I use aftermarket LED tail lights?
Only if they use the correct connector type and factory style wiring. Verify your tail light style and connector type before you buy, or contact KVS.
Are the tail lights included?
No. The kit includes one left and one right conversion harness. TAILLIGHTS NOT INCLUDED. The LED tail lights are sold separately.
Summary
Halogen and LED tail lights on the 2019-2023 GMC Sierra use different wiring. A vehicle specific plug and play harness adapts the connections and keeps the factory wiring intact. Confirm your truck came with halogen tail lights, then get the GMC Sierra Halogen to LED Tail Light Conversion Harness. TAILLIGHTS NOT INCLUDED.
