FITMENT
- 2011–2016 6.6L Chevy Silverado & GMC Sierra Duramax LML engines;
- Note: The base kit does not include DEF tank plugs, Does not include shift on the fly plugs (Available Separately).
DESCRIPTION
Product Overview
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Installing custom calibrations and off-road exhaust configurations on 2011–2016 6.6L LML Duramax trucks requires unplugging multiple factory exhaust and engine sensors. Leaving these raw, unshielded female terminals open beneath the chassis exposes sensitive engine harness pins to road spray, moisture, and debris—risking short circuits, pin oxidation, and permanent wiring degradation.
- Precision-molded for 2011–2016 LML connector geometry, this Weatherproof Tuner Harness Plug Kit provides complete electrical isolation for disconnected sensor leads. Equipped with heavy-duty locking tabs and internal weather seals, these plugs snap directly into open factory connectors—permanently sealing out water, mud, and road salt to safeguard your engine harness integrity for the life of your truck.
Key Features
- Forms an airtight barrier against car washes, mud, and road salt with molded automotive silicone/rubber seals.
- Keeps the factory pins clean and corrosion-free so the harness is ready to go back to stock whenever you are.
- Locks into place with OEM-accurate dimensions that match GM’s plugs and refuse to rattle loose under towing or off-road abuse.
- Holds up under hood with heat-stabilized, high-impact composite and silicone gaskets that shrug off the radiant heat of aftermarket exhaust and engine parts.
FAQ
Q: Does this kit cap the exhaust pipes or the wiring?
A: Wiring only. It seals the open plastic electrical connectors that hang under the chassis and in the bay after sensors are removed — it doesn’t touch mechanical exhaust piping or EGR metal ports.
Q: Can these plugs handle the heat under the truck?
A: Yes. They’re molded from heat-stabilized, high-impact composite with silicone gaskets, so they shrug off the radiant heat coming off aftermarket exhaust and engine parts.
Q: Which areas does this kit actually cover?
A: The four main disconnected zones on the LML: EGT plugs at the frame-rail sensors, NOx plugs at the chassis modules, DEF plugs at the tank harness, and EGR/9th-injector plugs under the hood.
Q: Are the plugs labeled to make install easy?
A: They don’t need labels — each one is keyed to a single connector. If a plug doesn’t snap home easily, it belongs to a different socket in the kit.
