Symptoms of a Bad or Failing Ignition Coil

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Cost of Replacing a Bad or Failing Ignition Coil

Common signs include the Check Engine Light coming on, engine misfiring, rough idle, a reduction in power, and the car not starting. Our certified technicians can come to you and diagnose the problem. You will receive a $30 credit towards any follow-up repairs that result from the diagnostic. Following are example prices for Ignition Coil Replacement. Click on the button below to get an upfront quote for your car.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2009 GMC Acadia $180 $81.88 $98.00 22% $232.38
2006 Mitsubishi Outlander $200 $129.98 $70.00 15% $237.48
2011 Mercury Mariner $339 $177.60 $161.00 20% $424.85
2013 BMW 650i Gran Coupe $149 $79.28 $70.00 20% $186.78
2011 Mercedes-Benz CL550 $170 $86.20 $84.00 20% $215.20
2003 Audi S6 $105 $35.28 $70.00 26% $142.78
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How to Diagnose a Bad or Failing Ignition Coil?

ignition cable

Ignition coils are an electronic engine management component that are a part of the vehicle’s ignition system. The ignition coil functions as an induction coil that converts the vehicle’s 12 volts into the several thousand that are required to jump the spark plug gap and ignite the engine’s air-fuel mixture. Some ignition systems will use one coil to provide the spark for all of the cylinders, however most newer designs use an individual coil for each cylinder.

As the ignition coil is the component responsible for generating the engine spark, any problems with it can quickly lead to engine performance issues. Usually a faulty ignition coil will produce a few symptoms that alert the driver of a potential issue.

1. Engine misfires, rough idle, and loss of power

One of the most common symptoms associated with a faulty ignition coil is engine performance issues. As the ignition coils are among the ignition system's most vital components, an issue can cause spark to be compromised, which can quickly lead to performance issues. Faulty coils may cause the vehicle to experience misfires, a rough idle, a loss in power and acceleration, and a reduction in gas mileage. In some cases the performance issues may even result in the vehicle stalling.

2. Check Engine Light comes on

Another symptom of a potential issue with the vehicle’s ignition coils is an illuminated Check Engine Light. Faulty coils can lead to engine performance issues, particularly misfires, which will trip the computer and set off the Check Engine Light. The Check Engine Light will also be set off if the computer detects an issue with the ignition coil signal or circuit, such as when a coil burns out or shorts. An illuminated Check Engine Light can be caused by a wide variety of issues, so having the computer (scanned for trouble codes)[https://www.yourmechanic.com/services/check-engine-light-is-on-inspection] is highly recommended.

3. Car is not starting

A faulty ignition coil can also lead to a no-start condition. For vehicles that use a single ignition coil as the source of spark for all of the cylinders, a faulty coil will affect the operation of the entire engine. If the coil fails completely, it will leave the engine without spark, which will result in a no spark, no-start condition.

Problems with ignition coils are usually easy to detect as they produce symptoms that will be quite noticeable to the driver. If you suspect that your vehicle’s ignition coils are having an issue, have the vehicle inspected by a professional technician from YourMechanic to determine if any coils need to be replaced.

Misfire
Check Engine Light
ignition system

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Recent Ignition Coil Replacement reviews

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YourMechanic Ignition Coil Replacement Service

Average Rating

4.7/5

Number of Reviews

699

Rating Summary
649
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649
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Theodore

13 years of experience
726 reviews
Theodore
13 years of experience
He was very helpful and win the problem wasn’t solved he figured out what was the problem and got additional parts to fix it. Very fast and punctual. Would definitely recommend him to anyone I know.
2001 DODGE GRAND CARAVAN - IGNITION COIL - KENMORE, WASHINGTON

James

8 years of experience
14 reviews
James
8 years of experience
James was very knowledgeable and he listened to and addressed my concerns relating to my car. I think he did a great job and I look forward to my next appointment with James.
2008 SUZUKI XL-7 - IGNITION COIL - HYATTSVILLE, MARYLAND

Chet

38 years of experience
383 reviews
Chet
38 years of experience
Chet was friendly, timely, and very knowledgeable. He was able to complete car service in a timely manner. He gave me great advice and recommendations for future service or issues. Five stars for Chet. I look forward to working with him in the future. Five stars.
2011 PORSCHE PANAMERA - IGNITION COIL - SAN DIEGO, CALIFORNIA

Ben

38 years of experience
829 reviews
Ben
38 years of experience
Ben was fantastic! Very friendly and communicative through the messenger. He worked very fast and took the time to provide pictures and explain everything about my repair service. I'll definitely look to book him the next time I need my car looked at.
2007 TOYOTA CAMRY - IGNITION COIL - PEARLAND, TEXAS

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