Why Is My Check Engine Light Flashing and Car Shaking?

Have you ever experienced abnormal behavior of check engine light? A faulty check engine light can often misguide you and give you an incredible experience. However, before realizing what happened to the check engine light, a most common question is why my car check engine light is flashing and car shaking? 

If this question has been raised on your mind also, we have got you covered. Here we’re going to cover all the facts regarding this issue. So, stick to our article and find your answer. 

What is a Check Engine Light?

The check engine light, also known as malfunction indicator or service engine lamp, is a crucial part of the onboard diagnostics system of a vehicle.

This is a computer-based system that runs on your vehicle’s computer. The whole system is named the Electric Control Module (ECM). 

What Does It Mean by A Blinking Check Engine Light and Car Shaking?

There are various sensors and actuators installed in your vehicle to detect any kind of malfunctioning. After that, they register this information to the computer system of your car.

If your car is shaking, the check engine light will appear on your car’s dashboard. In case you notice your check engine light blinking continuously instead of remaining steady, your car might be in serious trouble that you shouldn’t avoid at all. 

Therefore, taking the vehicle immediately after noticing any malfunctioning will be a wise move. First, however, you should have a more clarified idea about the reasons that can lead your car to shake and to blink the check engine light. 

Why Is My Check Engine Light Flashing And Car Shaking? 

When you have noticed the check engine light is flushing and your car is shaking simultaneously, that is a sign of a severe issue with your car. However, some common reasons may cause this unexpected mess. So let’s have a look:

  • Faulty spark plugs
  • Misfire
  • Poor fuel pressure
  • Faulty ignition coil
  • Faulty intake manifold gasket

Faulty Spark Plugs

Generally, your car’s spark can plugs last up to 100,000 miles. However, if you don’t replace them early, that may cause valve operating system issues.

Faulty spark plugs can also lead to shaking or vibrating your car, and check engine light flashing when accelerating as well as at low speed. 


Misfiring the engine is another reason why the check engine light is flashing, shaking the car. When you have noticed the check engine light blinking on your dashboard, it means the engine is dumping unburned fuel into the exhaust system. 

This is a serious issue indeed that can rapidly increase the temperature of the converter. The elevated temperature in the converter results in misfiring, and the check engine light start flashing. 

Poor Fuel Pressure

Insufficient fuel pressure can occur for many reasons: faulty fuel pump, loud noise in the fuel pump, leaking fuel, etc.

However, the most relatable fact about shaking your car is the insufficient fuel supply to the engine. Modern cars have an intelligent fuel pressure sensor that calculates whether anything is going wrong. 

If a fuel system malfunctioning, you may notice a P0190 code on your car’s dashboard. That means there might be something wrong with the fuel system of your car. 

When your car’s fuel system is on low pressure, it will destroy the spark plugs. So, if you haven’t replaced them yet and found them worn out before time, that’s indicating a problem with the fuel system. 

Faulty Ignition Coil

Ignition coils in a vehicle produce a spark that is crucial to fire in the cylinder. So, an issue with the ignition coil can cause stalling your engine, and before that, you may experience shaking.

The whole malfunctioning will lead to your check engine light flashing. Hence, you should also make a repairer inspection of the ignition coil. 

Faulty intake manifold gasket

A faulty intake manifold gasket can also be responsible for
flashing check engine light then stops the car. In addition, manifold gaskets play a vital role in sealing and overheating the engine when it lacks energy. 

Apart from this, an overheated engine can also cause check engine light flashing car shaking when something is wrong with the gasket. 

Check Engine Light Flashing Car Sputtering

If you notice your car check engine light is flashing and the car is spluttering, that might result from faulty or dirty spark plugs.

Spark plugs are the key components that regulate fuel ignition, so if it is dirty, the fuel ignition will be interrupted and result in car sputtering; check engine light on. 

Why is my check engine light car shaking when idle?

The rough idling of your car can lead to violent shaking that you might not expect at all. However, some possible reasons may cause flashing check engine light when it’s idle. These reasons may include:

  • Dirty Fuel Injectors
  • Worn spark plugs
  • Clogged Air Filters
  • Vacuum Leak
  • Oxygen Sensor
  • Motor Mounts

Check Engine Light Flashes When Accelerating Hard

Flashing the check engine light when accelerating results from the same malfunctioning or issues that result in shaking your car.

However, there are some additional reasons behind this occurrence, including faulty engine sensors, exhaust emission problems, internal engine problems, faulty engine control units, faulty crankshaft/camshaft sensor. 

Final Words

We hope you might have got relief from the question Why Is My Check Engine Light Flashing And Car Shaking? From now on, take immediate action whenever you’re facing any issues mentioned above.

Frequently Asked Questions

  • Can I Drive My Car with The Check Engine Light Blinking?

Simply the answer is “No”. When you have noticed a blinking check engine light on the dashboard, that means your car is in serious trouble. If you drive your car still then, you might be going to spend a lot of money later. 

  • Why is my check engine light flashing when car is off?

A flashing check engine light when the car is off is the result of an incomplete emissions test. However, this is almost normal for many cars. 

  • Why is my 2008 Ford Edge check engine light flashing and shaking?

This can happen when the catalytic converter of your Ford Edge is not getting raw fuel enough. However, there might another reason as well. So you should diagnose first. 

Leave a Comment