Yes, the 2018 RAM 3.6L has a PCV valve, and it can be replaced

The 2018 RAM 3.6L V8 engine uses a positive crankcase ventilation (PCV) valve as part of its emissions control system. Unlike some modern engines that route crankcase gases through the valve cover without a traditional replaceable valve, the 3.6L design includes a discrete PCV valve that wears out and can be serviced. The valve sits on the driver's side of the engine, mounted on or near the valve cover, and replacement is a job most owners can handle with basic hand tools in under an hour.

The PCV valve prevents pressure buildup in the crankcase by routing blow-by gases back into the intake manifold. Over time — typically between 80,000 and 150,000 miles — the valve can stick, clog, or fail to seal properly. When this happens, you may notice rough idle, oil leaks from gaskets, or increased oil consumption. Replacing it is straightforward and costs between $40 and $150 in parts, depending on whether you use OEM or aftermarket components.

Key Takeaways

  • The 2018 RAM 3.6L PCV valve is located on the driver's side valve cover and is a replaceable component, not a sealed design.
  • A failing PCV valve typically shows up as rough idle, oil leaks around gaskets, or higher-than-normal oil consumption.
  • Replacement requires removing the valve cover and disconnecting hoses, a task that takes 30 to 60 minutes with basic tools.
  • OEM Mopar PCV valves cost $60 to $120; aftermarket options run $40 to $80 and perform identically in most cases.
  • You do not need a dealer visit for this repair — independent shops and DIY work are both viable and will not affect your warranty if the truck is out of warranty.

Locating the PCV valve on your 3.6L engine

On the 2018 RAM 3.6L, the PCV valve is mounted directly to the driver's side valve cover. You will see it as a cylindrical component, roughly 3 to 4 inches long, with a rubber hose connected to the intake manifold on one end and another hose running to the crankcase on the other. The valve sits near the front of the engine, so access is reasonable without removing major components.

The exact position can vary slightly depending on whether your truck is a 1500, 2500, or 3500, but the general location remains consistent across the 3.6L platform. If you are unsure, the service manual for your specific model year and cab style will show a diagram. You can read the manual from RAM's owner portal or purchase a printed copy from a dealer parts department for $20 to $40.

What causes PCV valve failure in the 3.6L

The PCV valve fails for two main reasons: carbon buildup and seal degradation. Blow-by gases carry oil mist and carbon particles into the valve. Over thousands of heat cycles, these deposits accumulate inside the valve body, restricting flow or causing the internal poppet to stick in the open or closed position. The rubber seals inside also harden and lose their ability to hold pressure, especially if the engine runs hot or if oil changes are delayed.

Delayed oil changes accelerate this process because dirty oil carries more carbon and contaminants into the crankcase. Engines that idle frequently or spend time in stop-and-go traffic also see faster PCV wear because blow-by gases spend more time in the crankcase without being purged at highway speeds. If you have kept up with oil changes every 5,000 to 7,500 miles, you may not see PCV issues until 120,000 miles or beyond. If changes have been irregular, symptoms can appear as early as 60,000 to 80,000 miles.

Symptoms of a failing PCV valve

A stuck or failing PCV valve creates a pressure imbalance in the crankcase. If the valve stays open, pressure drops and outside air is drawn in through gasket seals, causing oil leaks around the valve cover, pan gasket, and rear main seal. If the valve sticks closed, pressure builds up and forces oil out through the same seals. Either way, you will notice oil on the outside of the engine or a slow drop in the dipstick reading between oil changes.

Rough idle is another common sign. When the PCV valve fails to route blow-by gases smoothly back into the intake, the air-fuel mixture becomes uneven, causing the engine to stumble at a stop. Some owners also report a slight hissing sound from the valve cover area or a faint oil smell in the cabin. In rare cases, a completely blocked PCV valve can cause the engine to run lean and trigger a check engine light, though this is less common on the 3.6L than on some other platforms.

How to replace the PCV valve yourself

Replacement requires removing the valve cover on the driver's side, which means disconnecting the intake manifold cover, spark plug wires or coils, and any hoses in the way. The exact steps depend on your truck's configuration, but the general sequence is: disconnect the negative battery terminal, remove the intake cover, unbolt the valve cover, disconnect the PCV hoses, unbolt the old valve, install the new one, and reassemble in reverse order.

You will need a socket set, screwdrivers, a gasket scraper, and new gasket material or a pre-formed gasket (often included with the valve cover kit). Most independent shops charge $150 to $300 in labor for this job, so DIY saves you $100 to $200 if you are comfortable working on engines. The entire process takes 30 to 60 minutes for someone with basic mechanical experience, or 90 minutes to 2 hours if you are doing it for the first time.

When you remove the old valve, inspect the hoses for cracks or hardening. If they are brittle or leaking, replace them as well — they cost $15 to $30 and will fail soon anyway. Clean the valve cover gasket surface with a gasket scraper and rubbing alcohol before installing the new gasket. Torque the valve cover bolts to the specification in your service manual (typically 80 to 100 inch-pounds for the 3.6L) to avoid over-tightening and cracking the cover.

OEM versus aftermarket PCV valves

Mopar (RAM's parts brand) offers the OEM PCV valve for the 3.6L, part number 68157151AA or similar depending on your model year. These typically cost $80 to $120 through a dealer or online parts retailer. Aftermarket options from brands like Dorman, Standard Motor Products, and Motorcraft are available for $40 to $80 and are functionally identical — they meet the same flow and pressure specifications and carry the same warranty.

The main difference is packaging and availability. OEM valves come with factory documentation and are may provide to fit your exact truck. Aftermarket valves are often sold with hoses and gaskets included, which can save you money if you need those items anyway. Either choice will work; the decision comes down to budget and whether you want the assurance of a factory part. For most owners, an aftermarket valve from a recognized brand is the better value.

When to see a shop instead of DIY

If you are not comfortable removing the valve cover or do not have the tools, a shop visit is the right call. Some independent shops will charge $150 to $250 total (parts and labor), while a RAM dealer typically charges $300 to $400. The job itself is not complex, but if you damage the valve cover gasket surface or over-torque bolts during removal, repair costs climb quickly.

You should also consider a shop visit if your truck is still under warranty and you want to avoid any question about coverage. Although PCV valve replacement does not void a powertrain warranty, having a dealer perform the work creates a clear service record. If you are past warranty (most 2018 RAMs are by now), an independent shop is usually the faster and cheaper option.

Frequently Asked Questions

Can a bad PCV valve damage my engine?

A failing PCV valve will not cause catastrophic engine damage in the short term, but it will accelerate wear on gaskets and seals by forcing oil out under pressure. Over months or years, this can lead to low oil levels, which does damage the engine. Replace the valve as soon as you notice symptoms to prevent secondary problems.

Will replacing the PCV valve fix my rough idle?

If rough idle is caused by a stuck PCV valve, replacement will fix it. If the idle problem is caused by something else — a vacuum leak, dirty fuel injectors, or a failing spark plug — the PCV valve replacement will not help. A shop can diagnose the root cause with a scan tool before you spend money on parts.

How often does the PCV valve need to be replaced?

There is no set replacement interval for the 3.6L PCV valve. It lasts as long as it lasts, typically 80,000 to 150,000 miles depending on driving habits and maintenance. Replace it only when symptoms appear or during a major engine service if you want to be proactive.

Is the PCV valve the same on all 2018 RAM models?

The PCV valve design is the same across 1500, 2500, and 3500 models with the 3.6L engine, but the part number may vary slightly by year and configuration. Always verify the part number in your owner's manual or with a parts retailer before ordering to may support you get the correct valve.

Can I drive with a bad PCV valve?

Yes, you can drive with a failing PCV valve, but you should not ignore it. The longer you wait, the more oil leaks out and the greater the risk of engine damage from low oil. If you notice symptoms, plan to replace the valve within a few weeks rather than months.