Auto DIY Fixes

How And Why Did My Chevy’s Check Engine Light Start Flashing?


This is something that will be said right away: if the light on your dashboard that indicates a problem with the engine is flashing, pull over immediately. If your vehicle’s “check engine” warning light is blinking, it indicates that there is a serious problem with the vehicle, and you should pull over immediately.

Carrying on with the journey might end up causing even more harm to your vehicle. We will now explain how the check engine light operates, what problems it may signify as well as what triggers it, and what prospective repair bills you may be looking at in the near future now that you have brought your vehicle to a halt.

When the “Check Engine” light comes on on your dashboard, it’s important to pay attention to what it’s telling you since it’s a message. It is a technique for the onboard diagnostics system of your vehicle to alert you to the fact that anything in the engine need your attention. However, this indication might manifest itself on a number of different levels.


The first problem, which might be classified as a minor or low-level concern, occurs when it is always turned on. In the second level, it alternates between being on and off at a more leisurely pace. This is a condition that has been categorized as intermediate in severity and does not necessarily require attention right now.

When the light flickers fast, you have reached the third level. When anything like this takes place, it is a sign that there is a significant problem that requires quick attention. You have to pull over in a safe place with your Chevrolet and then call for a tow truck. However, what does it imply when the check engine light stops flashing after it has done so?


Your vehicle has a warning system known as a check engine light (often abbreviated as CEL) that illuminates in the instrument cluster if there is a problem with the vehicle. The check engine light, or CEL, is often displayed when there is a problem with the vehicle’s engine. The issue might be anything from a contaminated fuel tank to a malfunctioning catalytic converter.

There are three possible patterns that your check engine light might display: constantly illuminated, intermittently lit, and flashing or blinking. Each of these patterns is described below. The manner in which your vehicle’s check engine light shines provides an indication of the severity of the problem; the following are some of the possible causes:



If your vehicle’s check engine light comes on and remains bright at all times, it is typically an indication that there is a problem with the engine, although a very small one. As was stated, this might be an indication of a variety of problems; nevertheless, it is often not too serious and should be very inexpensive to cure.

In point of reality, the check engine light might be activated by something as uncomplicated as a gas cap that is not securely fastened. A defective spark plug, a malfunctioning ignition coil, or filthy fuel injectors are a few examples of more typical difficulties.

It is likely that you will still be able to operate your automobile in a manner that is somewhat secure. Despite this, we nevertheless urge that you take your vehicle to a repair shop so that the problem may be diagnosed before it becomes any worse.

The check engine light blinks on and off at random intervals.
When this occurs, your vehicle’s check engine light will illuminate for a moment, then switch off, only to illuminate once more after some time has passed. This is often an indication that there is an issue with one of the engine’s sensors.

In addition, you could notice that your engine occasionally misfires, which is another symptom that could point to a malfunctioning ignition system.

Even if this occurs, you should still be able to operate your vehicle without putting yourself or others in danger. However, we stress the need of quickly identifying the issue and implementing a solution to it.


If the check engine light is blinking on your dashboard, as was previously said, you must immediately stop driving. It is not safe to continue driving at this point since it appears that there is a significant problem with your engine. Ignoring a check engine light that is flashing will result in far more serious damage as well as more expensive repairs.

Additionally, a misfiring engine is typically followed by the illumination of the flashing check engine light. The engine is misfiring to such an extreme degree that it may soon cause serious damage to important components like the catalytic converter.

This is the reason why the light is blinking. If your engine is misfiring, driving is going to be quite uncomfortable for you, and there is a chance that your vehicle could stop working soon. It is in your best interest to come to a complete stop and contact a tow truck to take the vehicle to the closest repair shop.


If you notice that your vehicle’s check engine light is blinking, there is a good chance that your engine will misfire. When a check engine light blinks instead of staying lit continuously, rather than just indicating that a problem exists, as was previously explained, this indicates that the misfiring or problem is an urgent one that threatens to cause further serious damage to important components in the vehicle. But what exactly is a misfire in an engine?

The combustion process takes place in your engine’s several cylinders, which is why your engine has so many of them. The combustion process is what ultimately drives the movement of your piston, which in turn drives the movement of your vehicle. If one or more of the cylinders in your engine are not firing, the synchronization of your engine will be interrupted, which will cause your engine to operate roughly.

This has repercussions for a few different aspects, including performance, fuel economy, and emissions. In the event that emissions are impacted, there is a possibility that your catalytic converter will be damaged, which will result in very costly repairs.



A faulty oxygen sensor is one of the most typical reasons why the “check engine” light is blinking on a vehicle. This sensor is responsible for determining the amount of oxygen that is present in the exhaust system of your vehicle. After gathering this information, it is then used to the process of determining the appropriate ratio of gasoline to air that should be delivered into your engine.

In the event that this sensor fails, your engine will receive the wrong mixture, which will result in misfires. In addition, as was discussed before, improper firing can result in expensive damage to the system’s other important components.

To replace an oxygen sensor can normally run you anything from $120 to $480, and that does not include the expense of labor. If, on the other hand, you want to complete the task on your own, the component alone shouldn’t set you back more than one hundred dollars.


This is another fairly common issue that can be easily resolved. As its name implies, the purpose of a spark plug is to produce an electric spark within the cylinder of your vehicle’s engine. This spark is what ignites the gasoline and air combination that is contained within your cylinder, which is essential for the functioning of your vehicle. Approximately every 10,000 miles, your mechanic should replace the spark plugs in your vehicle.

Therefore, if you keep up with the necessary maintenance on your vehicle, you shouldn’t have any issues with this. But bear in mind that if your spark plug dies early, there may be a more serious problem with your vehicle that you haven’t yet discovered. For example, an excessive amount of gasoline was injected, or there was a leak in the head gasket.

In the vast majority of cases, faulty spark plugs will not cause the check engine light to flicker; rather, the warning indicator will remain lighted all the time. On the other hand, if the misfiring grows worse, your check engine light could blink, which indicates that the problem has become severe enough that it could cause significant damage.

In any event, if you need to change the spark plugs in your vehicle, you can relax knowing that it won’t break the bank to do so. Spark plug replacement will cost you a maximum of $250 if you choose for the most expensive option. On the other hand, given how simple the process is, you may save some cash by performing the exchange on your own. Spark plugs on their own may be purchased for as little as ten dollars apiece.


Your vehicle’s ignition coil is the component that is accountable for supplying high-voltage energy to and powering the spark plugs. If the ignition coil in your vehicle has failed, it won’t be able to supply the spark plugs with the necessary amount of power. Because of this, the spark plugs in your engine are unable to produce a sufficient amount of spark to ignite the mixture of gasoline and air.

The diagnosis of an ignition coil might involve a number of different tests, one of which is the utilization of a spark tester. In any event, the cost of replacing your ignition coil will vary depending on whether or not you really need to do so. This is dependent on the sort of automobile you have as well as the ignition coil that your vehicle utilizes.

However, the majority of contemporary vehicles utilize either a pencil coil or a coil-on-plug method. If your vehicle has this, the cost to replace a full set of ignition coils will range from $150 to $300. This will depend on the specific model of your vehicle. When you factor in the cost of labor, your grand total may reach up to $450.


A distributor-type coil, as opposed to a coil-on-plug arrangement, is installed at a distance from the spark plugs and links to them through wires instead. The heat, the physical damage, or even simply ordinary wear and tear can occasionally cause this wire to fail. In the event that it does break, you will be responsible for replacing the wires.

If you don’t do it, the ignition system won’t operate correctly. To our great relief, these can be replaced at a reasonable cost. The price for a whole set of cables can range anywhere from $80 to $300, and it is determined by the brand and type of your vehicle. If there is a problem with only one of your wires, you may purchase replacement cables individually rather than purchasing the set as a whole to save some money.


Why does the Check Engine Light on my Chevrolet start flashing and then stop?
In the event that one of your emission systems is not ready, the “check engine” light on your Chevy will flash ten times before stopping. While you are driving, your vehicle does a check of all of its systems. If any of the systems, including the emissions systems, are not completely ready, a warning light will flash. After many driving cycles, the light will ultimately stop flashing.

What does it mean when the light that indicates the check engine is always flashing?
There might be a number of causes for this to take place. In this part of the post, we are going to investigate these causes in order to determine what it is that you need to look at and how it is possible for you to repair the problem.

As was said earlier in the introduction, the check engine light can flash in a number of various patterns, and each of these patterns indicates a distinct problem with the vehicle. The check engine light will first display itself in one of two ways: either it will be on continuously or it will blink.

When anything like this occurs, it’s a warning indication that you should have an experienced technician to inspect the engine for you so that you can find out what the issue is and how to fix it.

This is not a situation that would normally be considered an emergency; rather, it is something that you just need to make note of and attend to within a reasonable amount of time. The second possible scenario involves the dashboard’s check engine light flickering slowly.

This is not a true emergency, but it is a problem of an intermediate level that has to be resolved as soon as possible. When you notice this and the check engine light is continually on, it indicates that you need to go to the nearest technician so that the problem may be correctly identified and rectified.

The third sign that anything is wrong with the engine is when the warning light begins flashing rapidly. This is a very serious warning sign, and you need to pull over immediately and have your car towed to a shop so that it may be inspected and repaired. These are the three different levels of the check engine light that each represent a different level of caution.

What Does It Mean When the Check Engine Light on the Chevy Fades Out and Then Comes Back On?
This is the issue that is attempted to be answered by this essay, and we will proceed to investigate this topic in the next section. In a condition that should not be mistaken with the high-level warning in which the check engine light flashes constantly, the light may flash around ten times before coming to a complete stop.

This should not be confused with the high-level warning. There is no need for alarm if you notice something like this taking place. When you start your vehicle and drive it, it does some diagnostic testing on each component of the automobile. When compared to other aspects of the various systems, the activation of some subcomponents takes much more time.

When the diagnostics come across a component that has not yet been activated, the component can give the impression that it is malfunctioning, which would cause the error message to become temporarily active. In this specific instance, it will demonstrate that one or more of the emission systems are not yet ready to be used.

What may be causing my car to shake and for the check engine light to flash?
There is also the possibility that you may find yourself in a scenario in which the vehicle is shaking and the warning light for the engine is blinking. When you see this happening, it is a sign that your vehicle’s engine is not firing properly.

A misfire occurs when one of the pistons is not firing, which means that air and fuel are not being burned off during the combustion process.

Because of this, unburned gasoline is released into the exhaust system, leading to an increase in the amount of hydrocarbons that are emitted. In the event that it is not addressed promptly, misfiring can result in significant and expensive damage to the engine.

Having spark plugs that are in poor condition will also cause the check engine lights to blink.

When you notice that the check engine light has begun blinking, you should immediately do an inspection on these components since they might also be the reason of the engine not firing properly.


MY Final Thoughts on How And Why Did My Chevy’s Check Engine Light Start Flashing?
There are a few different causes that might result in the flashing of the check engine light on your dashboard. In order to take the appropriate action, you need to be able to determine if the problem is a genuine problem with the engine or whether it is a diagnostic procedure that your automobile is going through.

Also the single most crucial point to take away from this is that you must instantly come to a halt if the “check engine” light on your dashboard begins blinking. Instead of driving your vehicle to the nearest repair shop, you could contact a tow truck service and have it towed there. It is in your best interest to refrain from driving your vehicle until the nature and extent of the problem can be determined.

We can only hope that the replacement of your spark plugs or ignition coil will be all that is required to turn off the check engine light (or even a quick reset).

No matter what caused the damage, we strongly advise that you have the repairs done as soon as possible to prevent any future damage that may be much more expensive. It is preferable to avoid causing these problems rather than having to repair them.

Having said that, we are aware that the expenses associated with some repairs, such as the head gasket and the catalytic converter, may be prohibitively expensive.

If this is the case, then your alternative and maybe only choice is to sell your vehicle in the condition that it is now in. Because of this, you will need to sell it for less than the average price on the market; however, this also means that you won’t have to pay for any repairs, and instead, you will have cash in your hands.


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