An L5P CCV reroute system is a crankcase ventilation upgrade designed for 2017–2025 6.6L Duramax diesel trucks. It redirects oil vapors and blow-by gases away from the factory intake system, helping reduce intake contamination and improve long-term engine cleanliness and reliability.

In stock form, the L5P CCV system routes crankcase vapors back into the intake air horn. While this supports emissions compliance, it can also lead to oil buildup inside the intercooler, turbo piping, and intake components over time.

What Is an L5P CCV Reroute System?

An L5P CCV reroute system modifies the factory crankcase ventilation path. Instead of sending oil mist back into the intake, it redirects or filters those gases externally.

Typical configurations include:

• Reroute hose kits
• CCV filter setups
• Catch can systems
• Billet or aluminum adapter plates
• Sealed hose fittings for durability

The goal is to keep oil vapor out of the intake tract while maintaining proper crankcase pressure control.

How the Factory CCV System Works

On the L5P Duramax, the CCV system is connected to the valve cover and uses intake vacuum to pull crankcase gases back into the engine.

While this helps emissions performance, it can also:

• Carry oil mist into the turbo inlet
• Cause intercooler contamination
• Increase carbon buildup over time
• Reduce long-term intake efficiency

This is why many owners choose a CCV reroute system for cleaner airflow.

Benefits of an L5P CCV Reroute System

Installing an L5P CCV reroute system provides several advantages for performance and maintenance.

Cleaner Intake and Turbo System

Reduces oil residue in turbo piping, intercooler, and intake manifold.

Improved Long-Term Reliability

Less contamination means reduced wear on intake and turbo components.

Better Airflow Efficiency

Cleaner intake air helps maintain more consistent engine performance.

Reduced Maintenance Issues

Minimizes buildup that can affect sensors and airflow readings.

Stronger Performance Consistency

Helps the engine maintain stable operation under heavy load or towing.