2021 Kia Soul Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2021 Kia Soul: Common Causes and Solutions

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Reviewed by
Andrew Hajjar
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 2021 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 2021 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 steps to diagnose the check engine light on a 2021 Kia Soul?

When faced with a check engine light on your 2021 Kia Soul, it's essential to adopt a methodical diagnostic approach. Start by visually inspecting the gas cap, as a loose or damaged cap is a common and easily fixable issue that can trigger the light. Next, utilize an OBD-II diagnostic scanner to connect to your vehicle's OBD port; this tool will help you retrieve error codes that indicate specific problems within the engine or related systems. Once you have the codes, take the time to interpret them using the scanner's guide or an online resource, as this will direct you to the exact area needing attention. Additionally, check the levels of vital fluids such as engine oil, coolant, and transmission fluid, since low levels can also activate the check engine light. Finally, conduct a thorough inspection of the wiring and connections in the engine bay, looking for any signs of damage or corrosion that could be causing electrical issues. By following these steps, you can effectively narrow down the potential causes of the check engine light and take informed actions towards resolving the issue.

What are the common problems that could cause the check engine light to illuminate in a 2021 Kia Soul?

When the check engine light comes on in your 2021 Kia Soul, it can be a source of concern, but understanding the common problems that may cause this warning can empower you to take action. One of the simplest issues to check is the gas cap; a loose or damaged cap can easily trigger the light, so ensure it is securely fastened. If the gas cap is not the culprit, consider the oxygen sensor, which plays a crucial role in maintaining the correct air-fuel mixture. A faulty sensor can lead to performance issues and should be inspected. Additionally, problems with the catalytic converter can also illuminate the check engine light, often indicating a failure or inefficiency that needs addressing. Spark plugs and ignition coils are other critical components; worn or faulty spark plugs can cause misfires, while defective ignition coils can exacerbate this issue. Lastly, a malfunctioning mass airflow sensor can disrupt the air-fuel ratio, leading to engine performance problems. By being aware of these common issues, you can take the first steps toward diagnosing the problem, but remember that consulting a qualified mechanic is advisable for a thorough inspection and resolution.

How urgent is it to address the check engine light on a 2021 Kia Soul?

When the check engine light illuminates on your 2021 Kia Soul, it is essential to recognize the urgency of the situation. This warning light is not merely a nuisance; it signifies that your vehicle's engine or emissions system may be experiencing issues that could escalate if left unaddressed. While some triggers, like a loose gas cap, may seem trivial, others could indicate serious mechanical failures that could compromise your vehicle's performance and safety. Ignoring the check engine light can lead to decreased fuel efficiency, increased emissions, and potentially severe engine damage, which can be costly to repair. Moreover, unresolved issues may pose safety risks, making it imperative to have your vehicle inspected by a qualified mechanic as soon as possible. By taking prompt action, you not only safeguard your vehicle's health but also ensure a safer driving experience.

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