2016 Hyundai Genesis Has Rough Idle

Diagnosing Causes of Rough Idle in Your 2016 Hyundai Genesis and Solutions for a Smoother Ride

Find Repair Location
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 2016 Hyundai Genesis 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 2016 Hyundai Genesis 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.

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 initial diagnostic steps to take for a rough idle in a 2016 Hyundai Genesis?

When addressing a rough idle in your 2016 Hyundai Genesis, it's essential to adopt a systematic diagnostic approach that begins with the simplest checks. Start by inspecting for vacuum leaks, as these are often the culprits behind erratic idling. Look for any damaged or disconnected vacuum hoses that could disrupt the air-fuel mixture. Next, examine the spark plugs; worn or faulty plugs can lead to misfires, contributing to a rough idle. If the spark plugs appear to be in good condition, turn your attention to the ignition coil, ensuring it is functioning properly, as a malfunction here can also affect engine performance. Additionally, verify that the fuel injectors are delivering fuel consistently, as clogged or failing injectors can disrupt the combustion process. Don't overlook the air intake system; ensure that the Mass Airflow Sensor (MAF) or Manifold Absolute Pressure (MAP) sensor is clean and operational, as any issues here can lead to improper air metering. A dirty throttle body can also hinder engine performance, so check for any buildup that may be affecting its operation. Lastly, consider whether any engine software updates are available, as these can sometimes resolve underlying issues related to rough idling. By following these steps, you can effectively diagnose and potentially resolve the rough idle in your Hyundai Genesis before seeking professional help.

What are the common causes of rough idle in a 2016 Hyundai Genesis?

When experiencing a rough idle in a 2016 Hyundai Genesis, several common problems may be at play. One of the primary culprits is vacuum leaks, which can disrupt the air-fuel mixture and lead to unstable engine performance. Additionally, issues with the spark plugs, such as wear or fouling, can cause misfires that contribute to a rough idle. The ignition coil is another critical component; if it malfunctions, it can fail to deliver the necessary spark to the engine, resulting in uneven idling. Lastly, a misfire or a bad motor mount can cause the vehicle to shake while idling, further exacerbating the roughness. By understanding these potential issues, DIYers can take the first steps toward diagnosing and fixing the rough idle, ensuring their Hyundai Genesis runs smoothly and efficiently.

How urgent is it to address the rough idle in my 2016 Hyundai Genesis?

Addressing a rough idle in your 2016 Hyundai Genesis should be considered a priority, as neglecting this symptom can lead to more severe engine problems and costly repairs down the line. A rough idle often indicates underlying issues such as vacuum leaks, faulty spark plugs, or ignition coil malfunctions, all of which can disrupt the ideal air-to-fuel ratio necessary for optimal engine performance. While it may not seem like an immediate emergency, the longer you wait to diagnose and fix the problem, the greater the risk of exacerbating the issue. For DIY enthusiasts, it’s crucial to understand that rough idling can stem from problems with air, fuel, or spark delivery, which are essential for smooth engine operation. Therefore, taking the time to inspect these components and address any irregularities can prevent further complications and ensure your vehicle runs efficiently. Ultimately, while a rough idle may not pose an immediate safety risk, timely intervention is key to maintaining the longevity and performance of your Hyundai Genesis.

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.

2016 Hyundai Genesis Rough Idle: Causes & Solutions