Dodge Ram 6.7L Diesel CCV Delete Kit

The CCV (Crankcase Ventilation System) routes oil vapor from the crankcase back into the intake manifold to be re-burned. On the 2007.5–2024 6.7L Cummins, the factory CCV system is notorious for pushing excessive oil vapor into the turbocharger and intake tract, causing:

• Oil coking on turbocharger compressor wheels and intake manifolds
• Black sludge buildup in the intake system
• Increased oil consumption between changes
• Restricted turbo efficiency and reduced boost response

The SPELAB CCV Delete Kit reroutes crankcase gases away from the intake entirely, directing them through a breather filter or catch can instead. This eliminates oil carryover, protects the turbo, and keeps the intake system clean — especially beneficial on tuned trucks and vehicles driven hard or in dusty environments.

Yes — without the proper tune or bypass, removing the factory CCV system will trigger the P04DB fault code (Crankcase Ventilation System Disconnected). This is a known issue across multiple CCV delete kits and platforms.

Here is how to handle it:

• The SPELAB CCV Reroute Kit physically reroutes the crankcase vent — it does not electrically disconnect any sensors, which reduces (but may not eliminate) fault code risk
• If the P04DB code appears after installation, it can typically be cleared with an affordable OBD-II scanner or through a basic tuning device
• Pairing the CCV delete with a proper tuner (SCT, H&S, EFILive, or similar) that supports CCV deletion eliminates the code entirely by disabling that specific monitor

If you are not comfortable clearing codes yourself, any diesel tuning shop can handle this in under 10 minutes. The fault code does not indicate a mechanical problem — it is the ECM flagging a monitored system that no longer has a factory-style connection.

These are two approaches to solving the same problem:

• CCV Delete (full removal): Removes the factory CCV valve and block-off plate the system entirely. Requires tuning to disable the associated monitor. Most aggressive approach with maximum oil separation from the intake.
• CCV Reroute (SPELAB approach): Keeps the crankcase venting path open but redirects it away from the intake manifold — typically through an external breather tube or catch can. No sensor disconnection, minimal fault code risk. Easier to reverse if needed.

For the 2007.5–2024 6.7L Cummins, a reroute kit is the more common choice because it achieves 90% of the benefit with less tuning complexity. A full delete is preferred for competition or heavily modified builds where maximum turbo protection is the priority.

Fuel economy gains from a CCV delete are more modest compared to an EGR or DPF delete, but they are real:

• Typical reported gains: 0.5–2 MPG improvement, primarily on highway driving cycles
• Why it works: With oil vapor no longer entering the combustion chamber through the intake, the air-fuel ratio returns to a cleaner state. Less fuel is needed to compensate for contamination from crankcase gases.
• Combined gains: Owners who pair a CCV delete with an EGR delete commonly see 2–4 MPG combined improvement — the two systems work synergistically to reduce overall intake contamination

Results vary. Short-trip drivers see smaller gains because the engine spends more time in cold-start enrichment cycles. Highway-dominant drivers with tuned trucks see the most noticeable difference.

Yes — the CCV reroute is one of the more straightforward performance modifications on a 6.7L Cummins. Here is what to expect:

• Difficulty: Beginner to intermediate — no special tools or welding required
• Time required: 1–2 hours for most DIYers
• Tools needed: Basic socket set, screwdriver, pliers; most kits include the necessary hardware, hoses, and clamps
• Platform note: The 6.7L Cummins engine bay is relatively accessible from the top; no need to lift the cab or drop the transmission crossmember for this modification

The SPELAB kit is bolt-on with clear routing for the rerouted breather hose. Follow the included instructions, route hoses away from heat sources, and ensure all clamps are tight before starting the engine. After installation, start the truck and let it idle for 5 minutes — check for any air leaks at the hose connections before driving.