2015 Chevrolet Cruze Has Rough Idle

Diagnosing Causes of Rough Idle in Your 2015 Chevrolet Cruze and How to Restore Smooth Performance

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Reviewed by
Devin Cabugcal
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 2015 Chevrolet Cruze has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
  • Spark Plugs: Worn or fouled spark plugs can lead to misfires, poor fuel economy, and difficulty starting the engine.
  • 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 2015 Chevrolet Cruze 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.

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.

Customers with drum brake systems often specify they have lost braking power, or that the vehicle's brakes are making noise. This is because brake drums do not dissipate heat very well, so the heat from hard braking will cause stress fractures. These fractures make can make noise on the brake shoes as the drum revolves around the shoes. Lastly, the brake shoes may not be problematic, but may cause a grinding noise while stopping. This would indicate the shoes have no braking material left, and the brake shoes must be changed before the vehicle can be safely driven.

Learn more about brake shoe symptoms

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 2015 Chevrolet Cruze?

To effectively diagnose a rough idle in your 2015 Chevrolet Cruze, begin by turning on the ignition to initiate the diagnostic process. This simple step allows you to observe any immediate warning lights or irregularities in engine performance. Next, inspect the intake hose for blockages or damage, as issues here can significantly impact engine airflow and contribute to a rough idle. If the intake hose appears to be in good condition, consider replacing the valve cover, as a faulty valve cover can lead to oil leaks and engine misfires, further exacerbating idle issues. After completing these checks and any necessary repairs, take your vehicle for a test drive to assess whether the rough idle has been resolved. This methodical approach not only helps in identifying the root cause of the problem but also empowers you to tackle the issue with confidence.

What are the common causes of a rough idle in a 2015 Chevrolet Cruze?

When dealing with a rough idle in your 2015 Chevrolet Cruze, it's crucial to understand the common problems that could be at play. One of the first areas to check is the air filter; a dirty or clogged filter can significantly restrict airflow, leading to engine performance issues. Additionally, inspect the spark plugs, as worn or faulty plugs can cause misfires, which are often felt as a rough idle. Another potential culprit is vacuum leaks, which can disrupt the delicate air-fuel mixture necessary for smooth engine operation. Don't overlook the fuel system; a clogged fuel filter or malfunctioning fuel injectors can hinder fuel delivery, resulting in an uneven idle. The mass airflow sensor also plays a vital role in regulating the air-fuel mixture, and if it's faulty, it can lead to rough idling. Lastly, consider the EGR valve; if it's not functioning correctly, it can affect combustion and contribute to a rough idle. By systematically checking these components, you can identify and address the root cause of the rough idle, ensuring your Cruze runs smoothly again.

How urgent is it to address the rough idle in my 2015 Chevrolet Cruze?

Addressing a rough idle in your 2015 Chevrolet Cruze is not just a matter of comfort; it is crucial for the overall health of your vehicle. A rough idle can indicate serious underlying problems, such as issues with the fuel system, ignition components, or even engine wear. If left unaddressed, these problems can escalate, leading to more severe engine damage and costly repairs. Additionally, a rough idle often results in decreased fuel efficiency, which can significantly impact your wallet over time. By taking prompt action to diagnose and resolve the issue, you not only enhance your vehicle's performance but also extend its lifespan. Therefore, it is essential to prioritize this concern and tackle it head-on to avoid potential safety risks and ensure your Chevrolet Cruze runs smoothly for years to come.

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2015 Chevrolet Cruze Rough Idle: Causes & Repair Costs