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Trucktok 2017-2023 6.6L GM Chevy Duramax L5P Tuner Harness Plug Kit
Brand TruckTok

Trucktok 2017-2023 6.6L GM Chevy Duramax L5P Tuner Harness Plug Kit

SKU ER-0330
$139.99 - $139.99
$139.99
$139.99 - $139.99
$139.99

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in stock, ready to be shipped

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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

  • Defend your truck’s next-generation electronics from the elements. When configuring your 17–23 Duramax L5P with custom tuning, several factory emission and exhaust sensors are disconnected, leaving fragile open terminals vulnerable to catastrophic corrosion.
  • The L5P Tuner Harness Plug Kit delivers a complete set of precision-molded weatherproof caps. Specially designed for the L5P's complex harness geometry, these plugs seal out water, mud, salt, and grime to keep your factory wiring safe and dry.
Key Features
  • Material Composition: High-temp automotive grade ABS & premium silicone internal seals.
  • Waterproof & Anti-Corrosion: Armed with heavy-duty internal silicone gaskets that block out high-pressure car washes, road de-icing salts, and deep mud pits.
  • L5P-Specific Precision Molding: Unlike generic kits, every plug is engineered to mirror the exact terminal patterns of the  factory harness for an airtight fit.
  • OEM-Style Snap Locking: Built-in locking tabs securely click directly into the factory wire harness clips, ensuring they won’t shake or vibrate loose on rough terrain.

FAQ

Q: Does this kit fit the newer 2024+ refreshed Duramax L5P?

A: No, this kit is strictly for 2017–2023 model years. GM updated the ECM architecture and wiring harness configurations for the 2024+ refreshed trucks. 

Q: Do these plugs contain resistors to turn off dashboard trouble codes?

A: No, these are passive protective caps. They contain no electronics or resistors. To prevent Check Engine Lights or limp modes, your truck must be running a custom multi-map or delete tune flashed into the ECM.

Q: Why does the L5P kit look different from the older LMM or LML kits?

A: GM completely redesigned the Duramax wiring harness for 2017+, adopting new sensor layouts and plug geometries. This kit features exclusive, precision-molded connector shapes that match the updated L5P terminals, which older kits cannot fit.

Q: Can I accidentally force a plug into the wrong factory connector?

A: No, thanks to the built-in OEM-style "keyway" design. Each plug features unique alignment slots that act as a mechanical lock, meaning they will only slide into and click with their exact factory counterpart, making a mistaken installation virtually impossible.

  • 5 stars: 1 (17%)
  • 4 stars: 2 (33%)
  • 3 stars: 3 (50%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
Some of the reviews shown are from related products the merchant grouped with this one.
H
Hank Boudreaux
2022 L5P — ghost codes gone after plugs installed

2022 Silverado 2500. After my delete tune was loaded I still had P20EE and P249D pending codes. The tuner said those are rationality codes from the NOx sensors seeing an open circuit. Installed this plug kit, cleared the codes, and they never came back. The plugs have the right resistance to simulate a sensor still being connected. 10K miles since and the truck runs clean with no CEL.

B
Beau Fontenot
2020 L5P — 9th injector and DEF line heater covered too

2020 GMC Denali HD. The 2020+ L5P adds a 9th injector for DPF regeneration and a heated DEF line. This kit has plugs for both. The 9th injector connector is a different style than the other injectors and the kit has the correct plug. Also has the DEF tank heater and pump connectors. Installed in about 20 minutes — all under-truck connectors are reachable without dropping the tank.

W
Waylon Hightower
2018 L5P — more connectors than LML, all covered

2018 Silverado 3500. The L5P has a more complex emissions system than the LML — more NOx sensors, a different EGR cooler bypass setup, and additional pressure sensors. I was worried a generic kit would miss some, but this TruckTok L5P-specific kit had plugs for everything. The connectors are all OEM-style with locking tabs and the grommets seal tightly. No open connectors, no water intrusion.

D
Dusty Prather
EZ Lynk tuner confirmed — no open-circuit codes with these

2016 Silverado 2500. Had my tuner remote in after the delete and he said the harness was showing several open-circuit codes that the tune would need to mask. Added this plug kit, he re-checked, and the open circuits were gone because the plugs have the correct termination. That means fewer custom tune parameters and a cleaner flash. The plugs are cheap insurance for a clean tune.

C
Colt Boudreaux
Kept the LML factory harness reversible for resale

2015 GMC Denali HD. I wanted to keep the factory harness intact in case I sell the truck one day and the buyer needs it emissions-compliant. This plug kit caps every emissions connector without cutting anything. The DEF tank plugs are especially important because those connectors sit under the truck in salt and slush. The silicone boots are thick and sealed tight. 50K miles later the connectors underneath look brand new.

R
Rusty Weatherby
2013 LML — every open connector capped after DPF+EGR delete

2013 Silverado 3500. LML delete means you have open connectors for the EGR valve, EGR cooler bypass, throttle valve, DPF pressure sensor, DEF injector, DEF tank heater, and both NOx sensors. This TruckTok plug kit covers all of them. Each plug is weather-sealed with a silicone boot and clicks into the factory connector like OEM. No more moisture in the connectors, no more intermittent circuit codes. The kit is labeled so you know which plug goes where.