L5P CAN Bus Plugs 2017-2022

Why Does Your L5P Duramax Need a CAN Bus Plug Kit?

Broken CAN Network After Emissions Delete

When you remove the factory DPF, DEF tank, and NOx sensors from your 6.6L Duramax L5P, the wiring connectors that used to plug into those components are left hanging open. The CAN bus network in your truck relies on a continuous communication loop between the ECM, TCM, NOx modules, and DEF modules. Removing any component breaks that loop, leaving open circuits that the ECM cannot read. This causes immediate fault codes and puts the truck into a derated state with reduced power and speed limits.

ECM Communication Errors and Limp Mode

The 2017-2022 L5P Duramax uses a sophisticated Controller Area Network where every module communicates in real time. When you physically remove NOx sensors and DEF modules without installing CAN bus plugs, the ECM detects missing signals and flags P-codes for lost communication with those modules. Your truck may enter limp mode, limiting engine RPM and vehicle speed to protect what the ECM perceives as a critical system failure. This makes the truck undrivable for normal use until the CAN network is properly closed.

Incomplete Delete Tuning Setup

Delete tuning software for the L5P Duramax is designed to work with a properly closed CAN network. Even with a tuned ECM that has deleted the emissions parameters, the physical wiring still needs to be looped correctly. Without CAN bus plugs installed at the correct locations along the frame rail and near the TCM, the tune may not function as intended. Tuners and performance shops consistently report that CAN bus plugs are a required hardware component for any complete L5P delete build.

What Can a CAN Bus Plug Kit Solve?

Restores CAN Network Integrity Without Factory Components

Each CAN bus plug in the kit is a sealed, OEM-pin connector that snaps directly into the factory wiring harness at the exact locations where the NOx sensor modules and DEF modules were connected. The plug contains looped wires that close the circuit, providing a continuous signal path back to the ECM. This allows the CAN network to operate as if the factory modules are still present, even though the physical emissions hardware has been removed. The ECM sees proper resistance and signal continuity, eliminating communication fault codes.

Eliminates NOx and DEF Module Error Codes

The 2020-2022 L5P models have additional NOx sensors and a DEF tank module compared to the 2017-2019 trucks. The CAN bus plug kit for these later models includes specific bypass plugs for each of these modules. By replacing the NOx module connectors and DEF module connectors with properly pinned plugs, the ECM no longer throws codes for missing emissions components. This clears the check engine light, removes the speed limiter, and allows the truck to operate at full power with the delete tune loaded.

Enables Clean, Reliable Off-Road Tuning Operation

CAN bus plugs are the critical hardware link between your L5P delete hardware (EGR delete, DPF delete pipe, race exhaust) and the tuning software that makes it all work together. Once installed, the plugs seal the CAN network against moisture, dirt, and heat in the harsh under-hood and under-body environment. This ensures long-term reliability for your off-road build, whether you use the truck for sled pulling, drag racing, or farm and ranch work where emissions equipment is not required.

Shop L5P CAN Bus Plug Kit by Duramax Year & Fitment Guide

• 2017-2019 L5P CAN Bus Plugs: Fits 2017, 2018, and 2019 Chevy Silverado 2500 HD, 3500 HD and GMC Sierra 2500 HD, 3500 HD equipped with the 6.6L Duramax L5P engine. This 3-piece plug set replaces the NOx sensor connectors located along the lower frame rail and near the TCM. Direct snap-in installation with OEM-grade pins, no splicing or wire cutting required.
• 2020-2022 L5P CAN Bus Plugs with NOx & DEF Module Bypass: Fits 2020, 2021, and 2022 Chevy Silverado 2500 HD, 3500 HD and GMC Sierra 2500 HD, 3500 HD equipped with the 6.6L Duramax L5P engine. This plug set includes bypass connectors for both the NOx sensor modules and the DEF tank module, which are unique to the 2020+ L5P platform. The 2020-2022 models have additional emissions modules that require dedicated bypass plugs for proper CAN network closure.

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Frequently Asked Questions

What is a CAN bus plug for the L5P Duramax?

A CAN bus plug is a small, sealed electrical connector with OEM-grade pins that snaps into the factory wiring harness on your 6.6L Duramax L5P. It replaces the NOx sensor modules and DEF modules that are removed during an off-road emissions delete. The plug contains looped wires that close the Controller Area Network (CAN) communication circuit, providing a continuous signal path back to the ECM so the truck's electronic systems continue operating correctly.

Without these plugs, the open connectors left after removing emissions components would break the CAN network, triggering fault codes and potentially putting the truck into limp mode. CAN bus plugs are a required hardware component for any complete L5P delete build.

Why do I need CAN bus plugs for my L5P Duramax?

You need CAN bus plugs when you remove the factory DPF, DEF system, and NOx sensors from your 2017-2022 L5P Duramax for off-road use. When those components are disconnected, the wiring harness connectors are left open, which breaks the CAN communication loop between the ECM, TCM, and the removed modules.

The ECM detects the open circuits and flags communication fault codes, which can trigger a check engine light, reduce engine power, and activate speed limiters (derate mode). CAN bus plugs close those circuits so the ECM sees proper signal continuity, allowing your delete tune to function correctly and the truck to run at full power.

How many CAN bus plugs does the L5P Duramax need?

The number of CAN bus plugs depends on your model year. The 2017-2019 L5P Duramax typically requires 3 CAN bus plugs to replace the NOx sensor connectors along the frame rail and near the TCM. The 2020-2022 L5P models require additional plugs because they have more NOx sensors and a dedicated DEF tank module that also needs to be bypassed.

Each product listing specifies the exact plug count for your year range. It is important to install all plugs in the kit to ensure complete CAN network closure. Missing even one plug can leave an open circuit that triggers fault codes.

Are CAN bus plugs different for 2017-2019 and 2020-2022 L5P models?

Yes, the plug configurations differ between the two year ranges. The 2017-2019 L5P Duramax uses a 3-plug set that replaces the NOx sensor module connectors. The 2020-2022 L5P has an updated emissions system with additional NOx sensors and a DEF tank module, so the plug kit for these years includes bypass connectors for those extra components.

The physical connector shape and pin layout may also differ slightly between the early and late L5P models. Always select the plug kit that matches your specific model year to ensure proper fitment and correct CAN network closure.

How do I install L5P CAN bus plugs?

Installation is straightforward and requires no splicing, cutting, or wire modification. First, disconnect the battery and ensure the ignition is off. Locate the open connectors along the lower frame rail at the rear of the truck, near the TCM, and at the NOx sensor and DEF module positions. Simply unplug the factory connectors from the removed modules and snap the CAN bus plugs into those same connectors.

The OEM-grade pins slide into the factory connector housings with a firm click, creating a sealed, weather-resistant connection. Most installations take 15 to 30 minutes with no special tools required. Detailed installation videos are available online showing plug locations for both the 2017-2019 and 2020-2023 L5P models.

Where are the CAN bus plug locations on the L5P Duramax?

CAN bus plug locations on the L5P Duramax are along the lower frame rail at the rear of the truck, near the TCM (Transmission Control Module) on the driver's side, and at the NOx sensor positions in the exhaust path. On the 2020-2022 models, there is an additional connector at the DEF tank module location.

The open connectors are the same ones that were previously plugged into the NOx sensor modules and DEF module before they were removed. They are typically black 6-pin connectors. If you have already removed the emissions hardware, these connectors will be visible and accessible along the frame.

Do CAN bus plugs work with any L5P delete tune?

CAN bus plugs are a hardware component and are compatible with any L5P Duramax delete tune that requires a closed CAN network. They are not tune-specific because they simply close the electrical circuit on the factory wiring harness. Whether you are running an EFI Live tune, a bully dog tune, or a custom tune from your local diesel shop, the CAN bus plugs serve the same function.

However, always confirm with your tuner that CAN bus plugs are required for your specific tune. Most L5P delete tunes do require them, but some tuning strategies may handle the missing modules differently through software alone.

What happens if I don't install CAN bus plugs after a delete?

If you skip the CAN bus plugs, the open wiring connectors from the removed NOx sensors and DEF modules will break the CAN communication loop. The ECM will immediately detect missing modules and flag communication fault codes (P-codes). This typically triggers a check engine light and can activate derate mode, which limits engine RPM and vehicle speed to protect the system.

In some cases, the truck may not start or may run in a severely restricted limp mode. Even if the truck runs initially, the open connectors are exposed to moisture, dirt, and road debris, which can cause corrosion and additional electrical issues over time. Installing CAN bus plugs is a simple, low-cost step that prevents all of these problems.

Are CAN bus plugs reusable if I swap trucks?

In most cases, CAN bus plugs can be carefully removed and reused if you transfer them to another truck of the same year range. The OEM-style connectors are designed for a firm snap-in fit, so removal requires pressing the release tab and gently pulling the plug from the connector housing. As long as the pins and seals are not damaged during removal, the plug will function correctly in the new application.

However, if you are switching between different year ranges (for example, from a 2017-2019 truck to a 2020-2022 truck), you will need the correct plug kit for that year range since the connector configurations differ. Always inspect the plugs for pin damage or seal deterioration before reusing them.

What is EGR Performance's return policy for CAN bus plugs?

EGR Performance offers a 45-day hassle-free return and a one-year warranty. If the CAN bus plugs do not fit your L5P Duramax or you are not satisfied for any reason, you can return them within 45 days of delivery for a full refund. The one-year warranty covers manufacturing defects including failed seals, bent pins, and connector housing defects under normal use.

Contact our 24/7 live support team for immediate replacement if you receive a damaged or incorrect plug set. We ship from U.S. warehouses in California, Texas, Ohio, and New Jersey for fast delivery.