L5P CCV Reroute Kit | Fitment, Options & Parts

Choosing the right L5P CCV reroute kit starts with three questions: Does it fit your truck, which CCV configuration do you want, and does the selected package include every part required for installation?

For owners of a 2017–2025 GM truck with the 6.6L L5P Duramax, a properly selected CCV kit can redirect crankcase vapors away from the factory intake path. Depending on the configuration, those vapors may be routed through a hose or collected in a serviceable catch can.

If you already know your truck’s year and engine code, you can view the L5P CCV reroute kit from DieselPerf and confirm the current configuration, availability, price, and package contents.

Quick Answer: Which L5P CCV Reroute Kit Should You Buy?

The correct kit should meet all four of these conditions:

• It is listed for the 2017–2025 6.6L L5P Duramax.

• It matches your exact model year and truck configuration.

• It includes the adapter, hose, fittings, seals, clamps, and mounting hardware required for the selected installation.

• It uses either a direct reroute or catch-can arrangement that suits your maintenance preferences.

Choose a direct reroute configuration if you want fewer serviceable components. Consider a catch-can configuration if you prefer to collect part of the oil mist before the crankcase gases are vented or recirculated. A catch can requires periodic inspection and draining.

What Does an L5P CCV Reroute Kit Do?

CCV stands for closed crankcase ventilation. During normal engine operation, pressure and combustion gases can pass the piston rings and enter the crankcase. The factory CCV system manages these gases by routing them through the engine’s ventilation system.

Those gases can carry a small amount of oil vapor. When the vapor is sent back into the intake tract, it may leave an oily film on turbo-inlet and charge-air-system components over time.

An L5P CCV reroute kit changes this vapor path. Depending on its design, the kit may:

• Redirect crankcase gases away from the factory intake connection.

• Close the unused intake-side connection with a suitable cap or plug.

• Route vapors through an oil-resistant hose.

• Add a catch can that separates and stores some condensed oil.

• Provide a cleaner, more accessible CCV layout for inspection and maintenance.

A CCV reroute should be viewed primarily as an intake-cleanliness and crankcase-ventilation modification. It is not a substitute for repairing excessive blow-by, worn piston rings, a blocked factory separator, or other engine problems.

L5P CCV Reroute Kit Fitment

The DieselPerf product is marketed for the 2017–2025 6.6L GM Duramax L5P platform. Fitment should still be confirmed before ordering because production changes, chassis layouts, and previous modifications can affect installation.

L5P vs. LML: Do Not Order by Displacement Alone

Both the L5P and LML are 6.6L Duramax engines, but they belong to different generations.

• LML: commonly associated with 2011–2016 applications.

• L5P: introduced for the 2017 model year.

A kit designed for an LML should not be assumed to fit an L5P. Confirm the engine code using the VIN, vehicle documentation, emissions label, or a trusted GM parts reference before placing your order.

If your truck has a swapped engine or heavily modified intake system, contact the seller with the year, model, engine code, and clear engine-bay photos before buying.

Direct Reroute or Catch Can: Which Option Is Better?

There is no single best CCV configuration for every L5P owner. The right choice depends on how the truck is used and how much routine maintenance you want to perform.

Direct CCV Reroute

A direct reroute generally sends crankcase gases through a hose to a designated outlet rather than back into the factory intake connection.

Potential advantages include:

• Fewer components to service.

• A relatively simple hose layout.

• Reduced oil vapor entering the original intake path.

• Lower maintenance than a serviceable catch can.

Possible tradeoffs include vapor odor, visible residue near the hose outlet, and the need to choose a safe routing location. The hose must remain clear and should be kept away from exhaust heat, rotating components, electrical connections, and areas where oil residue could create a hazard.

Catch-Can Configuration

A catch can is installed in the vapor path to collect a portion of the condensed oil and moisture.

Potential advantages include:

• Collection of oil that might otherwise reach the intake or hose outlet.

• Easier monitoring of the amount of oil carried by the CCV system.

• Less external oil residue when the system is correctly designed and maintained.

The main tradeoff is maintenance. A catch can must be inspected and emptied at appropriate intervals. Cold-weather operation also deserves extra attention because moisture can accumulate or freeze if the system is poorly routed or neglected.

When comparing options, confirm whether the catch can, bracket, drain, hoses, and fittings are actually included. Do not assume a catch can is supplied simply because it appears in a related image.

What Parts Should an L5P CCV Reroute Kit Include?

Package contents can change, so the selected product option and current listing should always take priority. A complete installation commonly uses some or all of the following components:

Before checkout, compare the product description, selected variant, and photographs. If one component is not clearly identified, ask whether it is included rather than assuming it will arrive in the box.

Benefits You Can Realistically Expect

A well-designed L5P CCV reroute may help reduce the amount of oil vapor sent through the factory intake path. This can make the turbo-inlet and charge-air system easier to keep clean and may simplify visual inspection of the crankcase ventilation system.

However, buyers should avoid unrealistic expectations.

An L5P CCV reroute kit does not automatically:

• Add a specific amount of horsepower.

• Repair excessive crankcase pressure.

• Eliminate every trace of oil from the intake system.

• Replace normal engine maintenance.

• Delete or replace the DPF, EGR, SCR, or DEF systems.

• Correct an improperly diagnosed oil leak.

If the engine has unusual smoke, high oil consumption, heavy blow-by, or rapidly increasing crankcase pressure, diagnose the underlying condition before installing aftermarket CCV parts.

Buying Checklist

Use this checklist before adding an L5P CCV reroute kit to your cart:

1. Confirm the engine code. Make sure the truck has a 6.6L L5P, not an LML or another Duramax generation.

2. Match the model year. Verify that your exact year appears in the selected product’s fitment information.

3. Choose the CCV layout. Decide whether you prefer a direct reroute or a serviceable catch can.

4. Review every included part. Look for the adapter, hose, fittings, cap, clamps, seals, and hardware.

5. Check existing modifications. An aftermarket intake or turbo-inlet system may change the required hose routing or connection size.

6. Review installation support. Confirm whether instructions or technical assistance are available.

7. Check current stock and lead time. Availability and shipping estimates can change.

8. Understand local requirements. Confirm that the selected modification is permitted for your intended vehicle and use.

9. Review warranty implications. Ask the vehicle manufacturer, parts seller, and installer how the modification may affect coverage.

Installation Considerations

Installing an L5P CCV reroute kit generally requires access to components in a crowded diesel engine bay. The work may involve removing factory hoses, installing an adapter, sealing an unused connection, and securing a new hose route.

Important installation priorities include:

• Keeping every hose free from kinks and restrictions.

• Using oil-compatible hose and seals.

• Routing components away from heat and moving parts.

• Tightening fittings without damaging aluminum components or O-rings.

• Confirming that the intake-side connection is sealed correctly.

• Checking for oil seepage, vapor leaks, or loose hardware after installation.

• Inspecting the system again after the first heat cycles.

Owners who are not comfortable working around turbocharger, intake, and crankcase-ventilation components should use an experienced diesel technician.

Do not assume that every CCV configuration has the same tuning or calibration requirements. Ask the seller or your qualified installer about the exact kit selected for your truck.

Is an L5P CCV Reroute Kit Worth Buying?

An L5P CCV reroute kit can be worthwhile for an owner who wants to reduce oil-vapor recirculation through the factory intake path and is prepared to install and maintain the system correctly.

A direct reroute is generally better suited to buyers who value simplicity. A catch-can configuration may be the better choice for owners who want to collect and monitor condensed oil and do not mind periodic service.

The value of either option depends on accurate fitment, quality components, correct hose routing, and realistic expectations. The cheapest kit is not necessarily the best purchase if it lacks a critical fitting, uses unsuitable hose, or provides no support when fitment questions arise.

Shop the L5P CCV Reroute Kit

Ready to compare the current configuration and package contents? Shop the L5P CCV reroute kit for 2017–2025 6.6L Duramax applications.

Before ordering, select the option that matches your truck and review the cart summary carefully. If anything is unclear, confirm your model year, engine code, existing intake modifications, and desired CCV layout with the seller.

Frequently Asked Questions

What years does an L5P CCV reroute kit fit?

The linked kit is marketed for 2017–2025 trucks equipped with the 6.6L L5P Duramax. Confirm the exact year and vehicle configuration on the current product page before ordering.

Will an L5P CCV reroute kit fit an LML Duramax?

It should not be assumed to fit. The LML and L5P are different Duramax generations with platform-specific components. Use a kit explicitly listed for your engine code.

Does a CCV reroute add horsepower?

A CCV reroute is not normally purchased as a direct horsepower upgrade. Its main purpose is to change the crankcase-vapor path and reduce oil vapor entering the original intake connection.

Is a catch can better than a direct reroute?

A catch can can collect condensed oil and moisture, but it requires regular inspection and draining. A direct reroute has fewer serviceable parts but may produce more noticeable vapor odor or residue near the outlet.

Does the kit include a catch can?

Only assume a catch can is included when the selected product variant and cart description explicitly list one. Product photographs may show optional or related components.

Does an L5P CCV reroute remove the DPF or EGR?

No. A CCV reroute addresses crankcase ventilation. DPF, EGR, SCR, and DEF components are separate systems.

Does an L5P CCV reroute require tuning?

Requirements can vary by design and vehicle configuration. Confirm this point with the seller or a qualified L5P technician for the exact kit you select.

How often should a CCV catch can be drained?

The interval depends on engine condition, operating temperature, climate, load, and catch-can capacity. Inspect it frequently after installation until you establish a safe service interval for your truck.

Is a CCV reroute legal for a street-driven truck?

Regulations depend on the part, installation, and jurisdiction. In the United States, the EPA prohibits tampering with federally required emissions controls and the sale or installation of defeat devices.