TruckTok 2011-2023 6.6L GM Chevy Duramax LML L5P Tuner Harness Plug Kit - 2017-2023

FITMENT 2011–2023 6.6L Chevy Silverado & GMC Sierra Duramax LML L5P engines; Note: The base kit does not include DEF tank plugs, Does not include shift on the fly plugs (Available Separately). DESCRIPTION Product Overview Protect your truck's expensive factory wiring investment. When upgrading GM Duramax 6.6L LML L5P with custom tuning and off-road race configurations, several factory exhaust and engine sensors are disconnected, leaving vulnerable open plugs exposed to the elements. The Tuner Harness Plug Kit provides a complete set of heavy-duty, weather-proof block-off plugs. They snap directly into your disconnected factory connectors, completely sealing out water, mud, salt, and debris to prevent short circuits and corrosion. Key Features Weatherproof Seal: Molded with high-grade automotive silicone/rubber seals to form an airtight barrier against high-pressure car washes, mud, and road salt. Preserves Factory Wiring: Keeps factory harness pins clean, dry, and corrosion-free. If you ever need to return the truck back to its stock configuration, the original connectors will plug right back in flawlessly. OEM-Style Snap Locking: Designed to the exact dimensions of GM’s factory plugs. They click securely into place and will not vibrate loose under heavy towing or rough terrain. FAQ Q: Why do I need a harness plug kit after tuning my GM Duramax truck? A: When sensors are unplugged from the exhaust system, open chassis harness plugs are exposed to rain, mud, and road salt. These caps seal the electrical pin terminals completely dry, preventing short circuits and expensive wire harness replacement. Q: Will using electrical tape work just as well as these weather-tight caps? A: Electrical tape quickly melts under underbody heat, unravels in rainwater, and leaves sticky residue on pins. These hard-shell ABS caps provide permanent, heat-resistant, and reusable physical protection. Q: Can I zip-tie the sealed wiring harnesses up along the frame rail after capping them? A: Yes. Once sealed with our caps, zip-tying the loose wiring harnesses flat against the frame rail keeps them safely away from moving suspension components and exhaust heat. Q: Will installing these plugs prevent corrosion-induced short circuits that trigger false ECM error codes? A: Yes. By completely isolating the open copper pin terminals from road salt and ambient moisture, you prevent parasitic battery drain, unexpected CAN-bus network errors, and terminal pin oxidation.