2018 Ram 3500 Has A Vacuum Leak

Diagnosing Vacuum Leaks in Your 2018 Ram 3500: Symptoms, Causes, and Repair Solutions

Find Repair Location
Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
40% chance it's the
Leaking Vacuum Hoses
0%
30% chance it's the
Leaking Gaskets and Seals
0%
20% chance it's the
Bad Actuators and Valves
0%
10% chance it's
Something else
The most common reasons a 2018 Ram 3500 has a vacuum leak are leaking vacuum hoses, leaking gaskets and seals, or bad actuators and valves.
  • Leaking Vacuum Hoses: A cracked or disconnected vacuum hose can lead to a loss of engine vacuum, resulting in poor engine performance and increased fuel consumption.
  • Leaking Gaskets and Seals: Aged or damaged gaskets and seals can lead to fluid leaks, resulting in loss of engine oil or coolant and potential engine damage.
  • Bad Actuators and Valves: A malfunctioning actuator or valve can disrupt the proper operation of the vehicle's systems, leading to issues such as poor engine performance or erratic behavior of components like the HVAC system.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2018 Ram 3500 has a vacuum leak?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Problems with the intake manifold gasket can create the following symptoms:

  • Illuminated check engine light
  • Erratic engine performance
  • Oil and coolant leaks
  • Poor gas mileage
  • Stalling

» LEARN MORE: Intake manifold gasket symptoms

A bad valve cover gasket will result in an oil leak. You may notice oil under the car or on other parts under the hood. You might also notice a burning smell while driving.

» LEARN MORE: Signs of a bad valve cover gasket

Any time there is an emissions fault the check engine light will be displayed. The purpose of the check engine light is to inform the driver that an emission related fault has been found, and that there are on-board diagnostic (OBD) trouble codes stored in the powertrain or engine control module. Additionally, since the emissions systems are so intertwined into engine control and transmission control systems, symptoms may include nearly any sort of drivability concerns. This may include harsh shifting, failure to shift, hesitation on acceleration, jerking, engine failure to start or run, loss of power, or any number of other drivability issues.

What are the steps to diagnose a vacuum leak in a 2018 Ram 3500?

To effectively diagnose a vacuum leak in a 2018 Ram 3500, start with a thorough visual inspection of the engine bay. Look for any damaged or disconnected vacuum hoses, paying close attention to cracks, holes, or loose connections that could compromise the system. Next, listen for hissing noises while the engine is running, as these sounds can indicate the presence of a leak. If you suspect a leak, connect a vacuum gauge to the intake manifold to check the vacuum reading at idle; a reading lower than normal suggests a potential issue. For a more hands-on approach, spray soapy water on the vacuum hoses and connections; if bubbles form, you’ve identified the leak. If these methods do not yield results, consider performing a smoke test, which involves introducing smoke into the vacuum system to visually locate the leak. Finally, if the source remains elusive, utilizing professional diagnostic tools like a smoke machine or handheld vacuum pump can provide a more precise diagnosis. By following this structured approach, you can systematically identify and address vacuum leaks in your vehicle.

What are the common causes and symptoms of a vacuum leak in a 2018 Ram 3500?

When diagnosing a vacuum leak in your 2018 Ram 3500, it's essential to understand the common problems that can arise. Worn-out hoses are often the culprits, as the rubber can crack or develop holes over time, leading to air leaks that disrupt engine performance. Additionally, faulty vacuum fittings may become loose or damaged, further contributing to the issue. A damaged intake manifold gasket is another potential source of a vacuum leak, as it can fail to create a proper seal. Cracked or damaged vacuum lines can also be problematic, allowing air to escape where it shouldn't. Lastly, a malfunctioning vacuum pump can exacerbate these issues, making it crucial to inspect this component as well. Symptoms of a vacuum leak include a check engine light activation, rough idling, poor acceleration, a noticeable hissing noise from the engine bay, and a hard brake pedal, particularly if the leak affects the brake booster. By being aware of these common causes and symptoms, you can take the necessary steps to diagnose and address vacuum leaks, ensuring your Ram 3500 runs smoothly.

How urgent is it to address a vacuum leak in a 2018 Ram 3500?

Addressing a vacuum leak in your 2018 Ram 3500 is not just a matter of convenience; it is a critical maintenance task that demands immediate attention. A vacuum leak can severely compromise engine performance, leading to symptoms such as rough idling, stalling, and a noticeable drop in fuel efficiency. These issues not only make your driving experience less enjoyable but can also escalate into more serious problems if left unchecked. For instance, prolonged neglect of a vacuum leak can result in damage to vital components like the oxygen sensors and catalytic converter, which are essential for your vehicle's emissions control and overall functionality. Additionally, a vacuum leak can trigger the check engine light, signaling that your vehicle requires urgent attention. By addressing this issue promptly, you can prevent further complications and potentially save on costly repairs down the line. Therefore, it is crucial to prioritize fixing a vacuum leak to maintain the optimal performance and longevity of your Ram 3500.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.