2018 Kia Soul Has A Check Engine Light

Resolve Check Engine Light Issues in Your 2018 Kia Soul

Find Repair Location
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 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 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 2018 Kia Soul?

When faced with a check engine light on your 2018 Kia Soul, it's essential to approach the diagnosis methodically. Start by checking the gas cap, as a loose or damaged cap is a common and easily fixable issue that can trigger the light. Next, examine your dashboard for any additional warning lights or messages that might offer further insight into the problem. A visual inspection under the hood is also crucial; look for any obvious signs of damage to wires, hoses, or connectors that could be affecting your vehicle's performance. If these initial checks do not resolve the issue, using an OBD-II scanner can be a game-changer. This tool will help you retrieve specific error codes that indicate the underlying problem. Finally, don’t forget to consult your owner’s manual, which can provide valuable information about the check engine light and any manufacturer-recommended troubleshooting steps. By following this structured approach, you can effectively narrow down the cause of the check engine light and take the necessary steps toward a solution.

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

When the check engine light illuminates in a 2018 Kia Soul, it signals potential issues that DIYers can troubleshoot effectively. Start by inspecting the gas cap, as a loose or damaged cap is a frequent trigger for the light due to its role in the evaporative emissions system. If the gas cap is secure, the next area to investigate is the oxygen sensor, which is crucial for maintaining fuel efficiency and controlling emissions; a faulty sensor can lead to performance issues. Additionally, check for problems with the catalytic converter, as any inefficiency in this component can also activate the check engine light. The mass airflow sensor is another critical part to examine, as its malfunction can disrupt the air-fuel mixture, affecting engine performance. Worn or faulty spark plugs can lead to engine misfires, which are common reasons for the light to turn on. Lastly, consider the possibility of an engine misfire itself, which can arise from various ignition or fuel system issues. By addressing these common problems promptly, you can ensure your Kia Soul operates efficiently and prevent further damage.

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

When the check engine light illuminates in your 2018 Kia Soul, it signals a potential issue that requires immediate attention. Ignoring this warning can lead to serious consequences, including extensive engine damage and costly repairs. The check engine light often indicates problems with the engine or emissions system, which, if left unaddressed, can worsen over time. For DIY enthusiasts, it’s essential to understand that timely intervention not only preserves the vehicle's performance but also enhances fuel efficiency and safety. If you notice the light, consider using an OBD-II scanner to retrieve diagnostic trouble codes, which can help identify the issue. However, if the problem seems complex or if you’re unsure, consulting a qualified mechanic is advisable to ensure that the underlying cause is accurately diagnosed and resolved. Taking these steps can save you from more significant issues down the road, making it crucial to act swiftly when the check engine light appears.

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.