2023 Kia EV6 Has Rough Idle

Diagnosing the Causes of Rough Idle in Your 2023 Kia EV6 and How to Resolve the Issue

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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 2023 Kia EV6 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 2023 Kia EV6 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 the rough idle issue in a 2023 Kia EV6?

To effectively diagnose a rough idle issue in your 2023 Kia EV6, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by using an OBD-II scanner to identify any error codes, as these can pinpoint specific problems within the vehicle's systems. Next, inspect the spark plugs for wear or fouling, as these components play a crucial role in engine performance. A clean air filter is essential for optimal airflow, so ensure it is free of dirt and debris. Additionally, check for vacuum leaks in hoses and connections, as these can disrupt the air-fuel mixture and lead to rough idling. The throttle body should also be examined for carbon buildup, which can impede airflow; cleaning it may restore smooth operation. Don’t forget to test the idle air control valve, as it regulates the engine's idle speed. Finally, inspect the fuel system for any clogs or faults that could be affecting performance. By following this diagnostic approach, you can efficiently identify and resolve the rough idle issue in your Kia EV6.

What are the common problems that could cause a rough idle in a 2023 Kia EV6?

When dealing with a rough idle in your 2023 Kia EV6, it's crucial to understand the common problems that could be at play. One of the first things to check is the air filter; a dirty or clogged filter can significantly restrict airflow to the engine, leading to performance issues. Next, inspect the spark plugs, as worn or faulty plugs can cause misfiring, which directly contributes to a rough idle. Additionally, vacuum leaks can disrupt the air-fuel mixture, so examining the vacuum system for any leaks is essential. Fuel system issues, such as a clogged fuel filter or malfunctioning fuel injectors, can also impact engine performance, making it vital to ensure these components are clean and functioning properly. Furthermore, a faulty oxygen sensor can throw off the air-fuel ratio, exacerbating idle problems. Lastly, consider the throttle body; carbon buildup or sensor malfunctions here can disrupt airflow and lead to a rough idle. By systematically checking these components, you can effectively diagnose and address the issues causing your vehicle's rough idle, ensuring it runs smoothly and efficiently.

How urgent is it to address the rough idle in my 2023 Kia EV6 to prevent potential damage or safety risks?

Addressing a rough idle in your 2023 Kia EV6 is not just a matter of convenience; it is crucial for your vehicle's safety and longevity. A rough idle can signal underlying problems with the engine or other critical components, which, if left unchecked, may escalate into more severe issues that could compromise your vehicle's performance. Ignoring this symptom can lead to significant damage over time, potentially resulting in costly repairs and unsafe driving conditions. Issues related to the fuel system, ignition system, or emissions can all contribute to a rough idle, affecting not only the efficiency of your vehicle but also its overall reliability. Therefore, it is essential to act promptly and have your vehicle inspected by a qualified mechanic or an authorized Kia service center. By addressing the rough idle as soon as possible, you can ensure the safe operation of your Kia EV6 and prevent more serious complications down the road.

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2023 Kia EV6 Rough Idle: Causes & Repairs | RepairPal