If you drive a 2015 Ram truck with a 6.7L Cummins diesel engine, keeping your Crankcase Ventilation (CCV) filter in top shape is essential. Often overlooked, the CCV filter plays a critical role in maintaining engine health and emissions compliance. When it becomes clogged or saturated, your engine may start showing warning signs—some subtle, others more serious.
This guide will help you recognize the most common symptoms of a failing 2015 Cummins CCV filter, understand its function, and know when it’s time to replace it. Whether you’re a DIY truck owner or a professional diesel tech, this article is packed with expert insights and practical tips to keep your 2015 Cummins running strong.
What is a CCV Filter and Why Is It Important?
The CCV filter, also known as a crankcase vent filter, is responsible for capturing oil vapors and blow-by gases that escape from the crankcase. It prevents these emissions from being released into the atmosphere or re-entering the engine in excess, which can cause carbon buildup, turbo wear, or even oil leaks.
On the 2015 6.7 Cummins, the CCV filter is located on top of the engine valve cover and is a critical part of the Positive Crankcase Ventilation (PCV) system.
Why Timely CCV Filter Replacement Matters
Over time, this filter becomes saturated with oil and debris, leading to engine performance issues, excess crankcase pressure, and even oil leaks. Cummins recommends replacing the CCV filter approximately every 67,500 miles, but driving conditions, towing, and idling can shorten this interval.
Failing to replace it on time can lead to expensive engine repairs down the road.
Signs Your 2015 Cummins Needs a New CCV Filter
1. Oil Leaks Around the Valve Cover
Excess crankcase pressure caused by a clogged CCV filter can force oil to seep out of gaskets and seals. If you notice oil around the valve cover or turbo inlet, the CCV filter may be the culprit.
2. Increased Oil Consumption
Is your oil level dropping faster than usual, even without visible leaks? A saturated CCV filter can lead to poor oil vapor management, which increases oil usage and blow-by.
3. Check Engine Light (CEL)
The check engine light may come on if the engine’s sensors detect abnormal crankcase pressure or other issues related to air intake contamination.
4. Excessive Exhaust Smoke
A failing CCV filter may cause blue or gray smoke from the exhaust, especially under load. This is a sign of oil vapor entering the combustion chamber.
5. Unusual Engine Noises or Whistling Sounds
Restricted airflow through a dirty CCV filter may result in pressure build-up, causing unusual hissing or whistling sounds from the engine bay.
6. Poor Turbocharger Performance
Oil mist entering the turbo from a failed CCV system can cause carbon buildup on the turbo vanes, reducing efficiency and accelerating wear.
7. Strong Oil Smell Inside the Cab
If you smell oil fumes inside your truck, it could be blow-by gases escaping due to a saturated filter.
How to Check the CCV Filter on a 2015 Cummins
- Pop the hood and locate the CCV filter on the valve cover.
- Look for signs of oil saturation, residue, or damage.
- If it’s dirty or leaking, it’s time for a replacement.
- Replacement takes about 15–30 minutes with basic tools.
Pro Tip: Always use a genuine Mopar or Cummins OEM filter to maintain factory-level performance and ensure warranty compliance.
CCV Filter Replacement Interval for 2015 Cummins
- OEM Recommendation: Every 67,500 miles
- Heavy-duty Use (Towing, Idling): Inspect every 50,000 miles
- DIY Cost: ~$90–$120 for the filter, no labor if self-installed
Don’t wait until problems show up. Make the CCV filter part of your routine diesel maintenance schedule to prevent costly damage and maintain emissions compliance.
Final Thoughts
The CCV filter on your 2015 Cummins is small but mighty. Ignoring it can lead to performance loss, higher maintenance costs, and even engine damage. If you’re noticing oil leaks, smoke, or a drop in fuel efficiency, your CCV filter could be due for replacement.
As part of your regular truck care routine, keep an eye on this filter and replace it with a high-quality OEM version. Your Cummins engine will thank you with longer life and smoother performance.
Frequently Asked Questions (FAQs)
Q1: Where is the CCV filter located on a 2015 6.7 Cummins?
A: It sits directly on top of the engine valve cover, easily accessible for inspection and replacement.
Q2: Can I drive with a clogged CCV filter?
A: You can, but it’s risky. It can lead to excess crankcase pressure, oil leaks, and long-term engine wear. Timely replacement is safer and cheaper.
Q3: How do I know if I have a genuine Mopar CCV filter?
A: Genuine filters will have Mopar or Cummins branding, a part number, and come in sealed packaging. Avoid no-name filters from unverified sellers.
Q4: Does replacing the CCV filter improve fuel economy?
A: It can help maintain optimal fuel efficiency by reducing blow-by gases and ensuring proper air/oil separation in the crankcase.
Q5: What tools do I need to replace the CCV filter?
A: Basic hand tools like a socket wrench. No special tools are required, and the job can be done in under 30 minutes.
