2018 Kia Soul EV Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2018 Kia Soul EV: Common Causes and Solutions

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Reviewed by
Bo Fader
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 2018 Kia Soul EV 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 2018 Kia Soul EV 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.

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 steps to diagnose the check engine light on a 2018 Kia Soul EV?

To effectively diagnose the check engine light on your 2018 Kia Soul EV, start with a thorough visual inspection of the vehicle. Begin by checking the gas cap; ensure it is securely tightened and free from damage, as a faulty gas cap is a common trigger for the check engine light. Next, utilize an OBD-II scanner, which can be easily purchased or borrowed, to connect to your vehicle's diagnostic port. This tool will allow you to retrieve any error codes stored in the system, providing valuable insights into potential issues. Once you have the error codes, take the time to research their meanings, either through the vehicle's manual or reputable online resources. This step is crucial as it helps you understand the specific problems that may need addressing. If the diagnostics seem overwhelming or if the error codes indicate a more complex issue, don’t hesitate to seek assistance from a qualified mechanic. By following this methodical approach, you can efficiently identify and address the cause of the check engine light, ensuring your Kia Soul EV remains in optimal condition.

What are the common problems that could cause the check engine light to illuminate in a 2018 Kia Soul EV?

When the check engine light comes on in a 2018 Kia Soul EV, it can be a source of concern for any DIY car owner. One of the most straightforward issues to check is the gas cap; a loose or damaged cap can easily trigger the light, and simply tightening or replacing it may resolve the problem. Another common culprit is the oxygen sensor, which plays a crucial role in monitoring fuel efficiency. If this sensor is faulty, it can lead to increased fuel consumption and should be inspected. Additionally, problems with the catalytic converter can also cause the check engine light to illuminate, often indicating a more serious issue that may require professional attention. Spark plugs and ignition coils are other components that can lead to engine misfires and performance issues, so checking their condition is essential. Lastly, the mass airflow sensor, which regulates the air-fuel mixture, can malfunction and trigger the light as well. Addressing these common problems promptly not only helps in maintaining optimal vehicle performance but also prevents further damage, making it crucial for DIY enthusiasts to stay vigilant and proactive.

How urgent is it to address the check engine light in a 2018 Kia Soul EV?

When the check engine light illuminates in your 2018 Kia Soul EV, it signals a need for immediate attention to avoid escalating issues that could compromise your vehicle's performance and safety. Ignoring this warning can lead to more severe problems, including engine damage or failures in the emissions system, which can be costly to repair. For DIY enthusiasts, it's crucial to understand that while some minor issues may be manageable at home, the check engine light often indicates underlying problems that require professional diagnostics. Continuing to drive with the light on can also result in decreased fuel efficiency and performance, not to mention potential safety hazards on the road. Therefore, it is advisable to use an OBD-II scanner to retrieve diagnostic trouble codes, which can provide insight into the specific issues at hand. However, for any complex repairs or if the codes indicate serious concerns, seeking assistance from a qualified mechanic is the best course of action to ensure your Kia Soul EV remains in optimal condition.

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2018 Kia Soul EV Check Engine Light: Causes & Repairs