5 Common VW Jetta Ignition Coil Symptoms That May Surprise You

As a Jetta user, many have common questions, like what are the common symptoms of Volkswagen Jetta ignition coil failure? Jetta’s ignition coils usually failed to work from many perspectives.

Among different VW Jetta ignition coil symptoms, the common symptoms are engine misfires, rough idle, poor fuel economy, etc.

The ignition coils are generally used in VW Jetta for recognizing low battery voltage from 12V to high. So when their general activities fail to work, the engine will not start.

Along with these, we discuss more of the symptoms and failure issues below. So keep continuing to read.

What Are The VW Jetta Ignition Coil Symptoms?

A Volkswagen Jetta ignition coil generally stops working like before due to misfire issues. Another symptom one may find there is loss of engine fuel. This condition often occurs when the vehicle engine doesn’t get sufficient fuel to run. Sometimes VW coil pack failure symptoms are often related to the engine’s bad ignition conditions.

Again, excessive fuel consumption or low-level fuel density also impacts the terms of weak ignition coil failure symptoms. VW Jetta’s ignition coil goes bad if there is any engine leakage.

Overheating, extreme moisture intrusion, vibration, etc. are often caused by such difficulties, and lastly, they result in damage. Honestly, it is not hard to diagnose when an ignition coil may fail or get damaged.

Let’s walk you through all the possible symptoms you might face.

1. Engine Light Become Illuminating

Engine light illuminating may often occur when an ignition coil starts to fail. Electrical engines are usually getting worse due to start-up issues and loud engine cranks.

Another reason your engine light may illuminate in the instrument cluster is misfiring issues. Both of issues are interlinked with each. Engine misfiring is also responsible for the failure of the ignition coil in Jetta VW.

2. Overheating Issues

VW electrical components may get hot due to over-resistance problems. It could result in the ignition coils failing too. Hence, most of the ignition coil is filled with oil that helps to absorb and dissipate heat.

Overheating is also the reason for damaged spark plugs, wires, or the distributor. Sometimes VW ignitions can be bad for the higher firing voltages.

3. Failure To Reach Desired Acceleration

Ignition coils are not working properly if the engine fails to absorb sufficient fuels. The gas pedal in the Jetta requires a quantity of press to reach the desired speed. Once you hesitate to accelerate its pedal, the reason may occur. A poor acceleration of the engine retains to increase the vehicle’s desired speed. 

4. Rough Start or Hard Start

Sometimes VW ignition coil failure symptoms may vary in different cases. Bad ignition coils in VW Jetta are found to be troublesome for rough idle issues. If the engine has a vacuum leak or spark plug issues, it may cause a problem with the ignition coil. The Volkswagen Jetta’s engine may not start smoothly like before. They often feel difficult or rough when you turn them on the engine.

Nearly all VW’s model years and engines used coil packs which may stop misfiring issues. Rough idleness can also be recognizable if the engine seems to be vibrating inside the cabin.

5. Ignition System In Jetta Fail To Ignite Air/Fuel Mixture

If Jetta’s oil filter had remained unchanged for a very long time, the engine might have been driving in very tough conditions. Unfortunately, the air filter in Jetta sometimes gets clogged. If not, it found a great place to start.

However, you can get an option here to change or replace it asap. To have an idea, we may add here the 2015 VW Jetta ignition coil replacement cost, which is around $128-$159.

6. Internal Short Circuits For Inadequate Voltage

Your Jetta’s ignition coil shows more complexity if there are inadequate voltage issues. In addition, the machines’ ignition wire sometimes gets overheated due to short circuit issues. The main culprit behind these concerns is if the ignition parts will be aged more.

Again, if the ignition has problems with the modules, it could be burnt for lost control over the output stages.

On the other hand, it could make the ignition coil take more time to charge and become less effective than previous. The ignition coil also gets overloaded when it adopts inadequate voltage supplies.

How To Test A Bad Ignition Coil Of Jetta?

One can easily test the bad ignition coil of a Jetta quickly. Follow the below guidelines to check its condition.

  • The most common way to find out the bad ignition symptoms of Jetta is by reading its error code. For this, grab a scan tool and insert it into the OBD2 port
  • Scan it and read out the error code. Suppose the ignition scanning code will be P0303. It refers to cylinder number 3, which means the machine has misfiring issues. Unlike this, you may find here different codes that require different meanings.
  • However, now turn off the Jetta and let it cool down for a while. It will also be useful in preventing any burn injury.
  • Remove cylinder number 3 from the ignition coil. Again, scan the machine with a similar to diagnose its issues.
  • If it shows error code P0302, there is a misfire on cylinder 2.
  • If the ignition coil scanning result didn’t show any particular number or code, it needs to be replaced, or the coil ignition is damaged.

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Frequently Asked Questions (FAQs)

How Do You Test A VW Ignition Coil?

One can easily test out the ignition coil by reading the error code. You need to scan the number by plugging it into the OBD2 port. Unfortunately, Jetta’s error code gives different results when the problem is different. After realizing the difficulties, one may need to change or replace the coil.

How Do You Know If Your Coil Pack Needs Replacing?

There are many ways to observe that your coil pack needs to be replaced. The most common reasons you may find include damaged engines and idling and blinking lights. Another issue is a noticeable lack of power; the engine headlight shows very thin light while the vehicle produces plenty of gasoline.

Final Wrap

 It is a bit difficult to recognize why Jetta’s ignition coil fails to work. But diagnosing the problem isn’t impossible to do. Yet, the reason could vary depending on the conditions of the ignition coils of Jetta VW. One of the common reasons one may find for VW Jetta ignition coil symptoms is continued engine failure and the low speed of the vehicle.

Whatever the reasoning will be, you need to diagnose the problems first. After finding out the issues, check the parts along with others. It is because a bad ignition coil often impacts badly through other components.

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