FITMENT
- 2017–2023 6.6L Chevy Silverado & GMC Sierra Duramax 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
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Exposed wiring harness connectors are an easy target for moisture and corrosion after disconnecting stock emissions sensors on 2017–2023 L5P Duramax trucks. Unprotected open terminals beneath the frame rail quickly collect water, mud, and road grime—risking permanent pin corrosion and expensive electrical short circuits in your factory harness.
- Guard your truck’s electronic infrastructure with this complete L5P Weatherproof Sensor Plug Package. Engineered to fit every disconnected exhaust and engine sensor plug on 2017–2023 L5P platforms, these heavy-duty caps snap securely into place, creating a watertight seal that keeps your factory wiring clean, protected, and fully preserved in all driving conditions.
Key Features
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Combines high-temp automotive ABS with premium silicone internal seals for long service life.
- Defends against pressure washers, de-icing salt, and deep mud through heavy-duty internal silicone gaskets that block moisture.
- Mirrors the L5P’s exact terminal patterns with precision molding so each cap seats air-tight with no gaps.
- Clicks into the factory harness clips via OEM-style locking tabs that stay put over rough ground.
FAQ
Q: Does this fit the refreshed 2024+ L5P?
A: No — it’s for 2017–2023 only. GM reworked the ECM architecture and harness routing for the 2024+ trucks, so those need a different solution.
Q: Are there resistors in these plugs to clear codes?
A: No, they’re passive caps with no electronics inside. Keeping the Check Engine Light off requires a custom multi-map or delete tune already flashed to the ECM.
Q: Why does this kit look nothing like the older LMM or LML versions?
A: GM redesigned the Duramax harness for 2017+, moving sensors and changing plug shapes. These connectors are molded to the updated L5P terminals, which the older kits can’t mate with.
Q: Could I force a plug into the wrong connector by accident?
A: Practically impossible. Each plug has a keyway with unique alignment slots that only allow it to lock into its exact factory match.
