2020 Jeep Cherokee Has Rough Idle

Diagnosing Causes of Rough Idle in Your 2020 Jeep Cherokee and How to Restore Smooth Performance

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
21% chance it's the
Spark Plugs
0%
15% chance it's the
Ignition Coil
0%
64% chance it's
Something else
The most common reasons a 2020 Jeep Cherokee has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
  • Spark Plugs: A worn or fouled spark plug can cause misfires, rough idling, and decreased fuel efficiency due to incomplete combustion.
  • Ignition Coil: A faulty ignition coil can cause misfires, rough idling, and difficulty starting the engine due to inadequate spark delivery to the spark plugs.
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 2020 Jeep Cherokee has rough idle?

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.

Brake caliper failure occurs in two different ways, and they create different symptoms.

The caliper can become stuck, in which case it won't release the brake pads. The seized caliper will cause the vehicle to brake constantly on one side, forcing the car to move toward that side. This pulling will be accompanied by a strong odor from one wheel.

Another way calipers fail is by leaking. If the caliper leaks, the brake pedal will feel too easy to push, and will sink all the way to the floor when held. Braking will become less effective the longer this goes on. There may also be brake fluid leaking onto the wheel.

Here are a few common symptoms of worn-out brake pads:

  1. Low brake pad warning light is on: Not all vehicles are equipped with this system, but if yours is, this dashboard indicator light will likely be the first signal it’s time to replace your brake pads.
  2. Brakes start to squeal regularly: This is often one of the first signs of worn brake pads and is caused by a metallic piece built into brake pads for this exact purpose. This part contacts the brake rotor to make a squealing or whining noise when the pads are low.
  3. Brakes make loud grinding noise: If not addressed early enough, your brake pads may get so worn that the metal backing plate of the pad grinds against the metal rotor.
  4. Brake pads look thin: You may be able to visually check your brake pad thickness to determine if they need replacement.

Brake rotors are mainly maintenance free, but when they have been subjected to abnormally hard use, the heat they absorb can cause the metal to turn blue, and cracking to occur. When this occurs, customers often specify they have lost braking power, or the vehicle's brakes are making noise. There may be no symptoms at all related to changing the brake rotors, since it is recommended to change brake rotors on most modern vehicles when performing a standard brake service.

Most often, a brake system inspection will just be a routine portion of manufacturer specified maintenance, and will be performed at mileage intervals. In those cases, there will likely be no symptoms. However, when a brake system makes a funny noise, causes vibration, is hard to use, will not slow the vehicle, prevents the vehicle from driving, makes the vehicle pull to one side, or leaks brake fluid, the vehicle will need a visit dedicated to the inspection of the brake system.

What are the steps to diagnose a rough idle in a 2020 Jeep Cherokee?

To effectively diagnose a rough idle in your 2020 Jeep Cherokee, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting for vacuum leaks, as these can significantly disrupt the air-fuel mixture and lead to an unstable idle. Look for any cracks or loose connections in the vacuum hoses, particularly around the intake manifold. Next, examine the condition of the spark plugs; worn or faulty spark plugs can cause misfires and contribute to rough idling. If the spark plugs appear to be in good shape, turn your attention to the ignition coil, as a failing coil can manifest through symptoms like a check engine light, poor performance, and increased emissions. Utilizing an OBD scanner can be invaluable at this stage, allowing you to retrieve trouble codes that may point to specific issues related to the rough idle. Finally, don’t overlook the motor mounts; inspect them for signs of wear or failure, as damaged mounts can cause excessive engine movement and contribute to a rough idle. By following this structured diagnostic approach, you can identify and address the root causes of the rough idle in your Jeep Cherokee, ensuring a smoother driving experience.

What are the common problems that could cause a rough idle in a 2020 Jeep Cherokee?

When dealing with a rough idle in your 2020 Jeep Cherokee, it's crucial to understand the common problems that may be at play. One of the primary culprits is vacuum leaks, which allow unmetered air to enter the engine, disrupting the delicate balance of the air-fuel mixture necessary for smooth operation. Additionally, spark plug issues can significantly impact ignition performance; worn or faulty spark plugs can lead to misfires, resulting in an uneven idle. Ignition coil problems are another frequent cause, as a malfunctioning coil can prevent the spark plugs from firing correctly. Furthermore, don't overlook the Idle Air Control (IAC) valve and the idle control valve, both of which play vital roles in regulating engine idle speed. Addressing these issues promptly not only enhances your vehicle's performance but also ensures a more enjoyable driving experience. By understanding these common problems, you can take the first steps toward diagnosing and fixing the rough idle in your Jeep Cherokee.

How urgent is it to address the rough idle in my 2020 Jeep Cherokee?

When it comes to your 2020 Jeep Cherokee, addressing a rough idle should not be taken lightly. While it may seem like a minor annoyance, this symptom can signal deeper issues that, if ignored, could escalate into more significant problems. A rough idle often indicates that the engine is struggling to maintain a consistent RPM, which can lead to decreased fuel efficiency and increased emissions. Moreover, neglecting this issue can result in costly repairs down the line, as underlying problems may worsen over time. For DIY enthusiasts, it’s crucial to recognize that a rough idle could be linked to various factors, such as a dirty throttle body, faulty spark plugs, or issues with the fuel system. Therefore, while it may not be an immediate emergency, it is advisable to investigate the cause of the rough idle sooner rather than later. Taking proactive steps to diagnose and resolve the issue can help ensure your Jeep continues to perform optimally and avoid potential safety risks associated with engine malfunctions.

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2020 Jeep Cherokee Rough Idle: Causes & Repairs | RepairPal