2017 Hyundai Ioniq Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2017 Hyundai Ioniq: Common Causes and Solutions

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
40% chance it's the
Emissions System
0%
60% chance it's
Something else
The most common reasons a 2017 Hyundai Ioniq has a check engine light are an emissions system component, a sensor, or a catalytic converter.
  • Emissions System: A faulty emissions system component, such as an oxygen sensor or EGR valve, can lead to increased emissions and trigger the check engine light.
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 2017 Hyundai Ioniq has a check engine light?

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.

A faulty oxygen sensor is one of the most common causes of a check engine light. Symptoms may include a decrease in fuel mileage, hesitation or misfiring from the engine, rough idling or even stalling. A faulty sensor may cause the vehicle to fail an emissions test.

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.

Due to the nature of electrical systems on modern vehicles, the range of problems these can cause are nearly limitless. However, there is a way to categorize them in two ways. Permanent and intermittent problems. Permanent problems appear and remain. This may be the vehicle will not start, the radio does not work, or the door chime will not turn off among many, many others. These problems are more straight-forward to diagnose since they present themselves at all time. This means there will always be a fault to find. Intermittent electrical problems, however, can be difficult or impossible to locate, since they appear then disappear without warning. The best case scenario for an intermittent issue is when replicating the problem is easily accomplished and understood. This allows a technician to make an issue semi-permanent, allowing them to find the fault. Other issues that come and go without warning and cannot be replicated on demand must occur when the technician is servicing the vehicle, otherwise there is no problem to correct. It is most important to understand that electrical system faults always require inspection, and can include the vehicle working in any manner, or not working at all.

Like we noted in the last section, general diagnosis symptoms are the most vague of the bunch. There are several diagnostic spectrums, electrical diagnosis, drivability diagnostics, engine diagnostics, transmission diagnostics, and the list could continue for about 5 or 10 more spectrums of diagnostics. The most important take-away here, is that general diagnostics are diagnostics that have no other spectrum in which they fit, or the problem is unknown. This means that any vehicle left outside of a repair facility with the keys and an authorization to perform diagnosis will be diagnosed under the general diagnosis spectrum.

When the Check Engine Light comes on, you may experience engine performance issues such as poor acceleration, rough idling, or an engine that won't start. In some cases, no abnormal symptoms will be experienced. Other systems like the transmission or ABS can cause the Check Engine Light to illuminate and lights for those systems can come on at the same time. Similar lights may say "Check Engine Soon", "Malfunction Indicator Light" or just "Check". In rare case the engine can overheat.

What are the initial diagnostic steps to take for a check engine light on a 2017 Hyundai Ioniq?

When faced with a check engine light on your 2017 Hyundai Ioniq, the first step is to check the gas cap, as a loose or damaged cap is a common and easily fixable issue that can trigger the warning light. Next, take a moment to inspect your dashboard for any additional warning lights that may indicate other underlying problems. Pay attention to any unusual symptoms your vehicle may be exhibiting, such as strange noises, rough idling, or a noticeable drop in performance, as these can provide valuable clues for diagnosis. Utilizing an OBD-II scanner is a crucial step in this process; it allows you to retrieve specific error codes from your vehicle's computer, which can pinpoint the exact issue. Finally, consulting your owner's manual can offer insights into what the check engine light signifies and suggest further troubleshooting steps tailored to your model. By systematically following these steps, you can effectively gather the necessary information to address the cause of the check engine light and potentially resolve the issue on your own.

What are the common problems that could cause the check engine light to illuminate in a 2017 Hyundai Ioniq?

When the check engine light illuminates in a 2017 Hyundai Ioniq, it can signal a range of common issues that are often manageable for DIY enthusiasts. One of the simplest problems to check is a loose gas cap, which can easily be tightened or replaced if damaged. More complex issues may involve the oxygen sensor, which monitors exhaust gases and can fail over time, leading to decreased fuel efficiency and increased emissions. Another critical component is the catalytic converter; if it becomes clogged or inefficient, it can trigger the check engine light and may require professional attention. Additionally, worn spark plugs can cause misfires, resulting in the light coming on, and these can be replaced with basic tools. The mass airflow sensor, which measures the amount of air entering the engine, can also malfunction, affecting performance and emissions. Lastly, a faulty ignition coil can lead to engine misfires, further illuminating the check engine light. While some of these issues can be diagnosed and addressed at home, it’s essential to monitor the vehicle's performance and seek professional help if the problem persists, ensuring the longevity and efficiency of your Hyundai Ioniq.

How urgent is it to address the check engine light in a 2017 Hyundai Ioniq?

When the check engine light illuminates in your 2017 Hyundai Ioniq, it is essential to recognize the urgency of the situation. This warning signal is not merely a nuisance; it indicates potential issues with your vehicle's engine or emissions system that could adversely affect performance and fuel efficiency. Ignoring this light can lead to more severe complications, resulting in costly repairs down the line. While some problems may be minor and easily fixable, it is crucial to investigate the cause promptly to prevent further damage. Fortunately, modern vehicles like the Ioniq come equipped with advanced onboard diagnostics that can help you identify the issue. For DIY enthusiasts, utilizing an OBD-II scanner can provide valuable insights into the specific trouble codes triggering the light, allowing you to make informed decisions about whether to tackle the repair yourself or consult a professional. Ultimately, addressing the check engine light without delay is vital for maintaining the health and longevity of your vehicle, ensuring a safe and efficient driving experience.

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2017 Hyundai Ioniq Check Engine Light Guide | RepairPal