Ask the Hyundai Dealer: 4 Common Signs of a Faulty Ignition Coil

The ignition coil, an essential component in your Hyundai’s ignition system, is responsible for transforming low voltage from the battery into high voltage required to generate a spark for igniting the air-fuel mixture in the combustion chamber. Visiting a Hyundai dealer for diagnosis and repairs is crucial as they have specialized knowledge, ensuring accurate identification of the faulty ignition coil and reliable repairs tailored specifically to your vehicle. 

1. A Loss of Power

If you notice a significant loss of power in your vehicle, it could be a sign of a defective ignition coil. When the coil is faulty, it may fail to deliver a strong spark, resulting in poor engine performance. You may experience sluggish acceleration, difficulty climbing hills, or a general lack of power. If you start to experience these symptoms, it’s best to have your ignition coil checked by a qualified mechanic to regain optimal engine function.

2. Your Check Engine Light Is On

One of the common indicators of a defective ignition coil is the illumination of the check engine light on your dashboard. The check engine light serves as a warning system that detects various issues with your vehicle’s components, including the ignition system. When the ignition coil is malfunctioning, it can trigger the check engine light. 


Ignoring this warning can lead to further engine damage or decreased fuel efficiency. It’s important to have your vehicle’s diagnostic system scanned to retrieve error codes and pinpoint the specific issue. A professional mechanic can then diagnose the problem and recommend the necessary repairs to resolve the ignition coil issue.

3. Your Fuel Economy Decreases

A damaged ignition coil can contribute to poor fuel economy in your vehicle. When the coil is faulty, it can lead to incomplete combustion or misfires, resulting in inefficient fuel consumption. You may notice that you are visiting the gas station more frequently than usual and that your vehicle’s fuel efficiency has significantly decreased. 

4. Misfiring Engine

When an engine misfires, it means that one or more cylinders fail to ignite the air-fuel mixture properly. This can result in a rough-running engine, noticeable vibrations, and a lack of smooth power delivery. A damaged ignition coil can cause inconsistent or weak sparks, leading to misfires. 


If you experience frequent engine misfires, it’s crucial to have your ignition coil checked. Ignoring this issue can lead to further damage to the engine components, such as the spark plugs or catalytic converter.


Potential causes of a defective ignition coil include electrical faults, wear and tear over time, exposure to extreme temperatures, or moisture intrusion, which can all lead to compromised performance and eventual failure. If you’ve experienced any of the above-named issues, don’t hesitate to reach out to us. Send us a message at Crain Hyundai of Fort Smith to book your diagnostic appointment with our experienced team.

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