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Check Engine Light Flashing and Car Shaking, Here’s the Solution

Check Engine Light Flashing and Car Shaking

The check engine light flashing and car shaking is an important warning indicator, within your car’s dashboard. When it starts flashing, accompanied by noticeable car shaking or vibrations, it’s a cause for concern.

Check Engine Light Flashing and Car Shaking, Here's the Solution

Check Engine Light Flashing and Car Shaking

In this blog post, we will explore the potential causes behind a flashing check engine light and car shaking. As well as provide some guidance on what steps to take.

What Does Check Engine Light Flashing and Car Shaking Mean?

There are two types of check engine lights: steady ones and lights that repeatedly blink at a set pace.

The steady illuminated check engine light usually indicates that a diagnostic fault code has been logged and stored, whether it is currently active or not. It signifies that there is an issue that needs attention, but it may not be an urgent matter.

On the other hand, a blinking check engine light is more concerning as it typically signifies a more serious problem that is actively occurring in the vehicle. It is meant to relay an important message to the driver.

When the Check Engine Light starts flashing and your car begins to shake, it indicates a critical issue that requires immediate attention. This combination of symptoms typically suggests a severe misfire in the engine.

A misfire occurs when the fuel in one or more cylinders fails to ignite properly. This can be caused by various factors, such as faulty spark plugs, ignition coils, or fuel injectors. When a misfire happens, the engine’s smooth operation is disrupted, leading to noticeable vibrations or shaking throughout the vehicle.

The flashing Check Engine Light specifically indicates an active misfire that is ongoing. Ignoring this warning and continuing to drive the vehicle can result in further damage to the engine or its components. It is crucial to address the issue promptly to prevent more significant problems and potential breakdowns.

To resolve the flashing Check Engine Light and car shaking, it is recommended to have your vehicle inspected by a qualified mechanic or visit a dealership. They will diagnose the underlying cause of the misfire and take appropriate measures to rectify it. Prompt repairs can restore the engine’s performance, improve fuel efficiency, and ensure the safety and reliability of your vehicle.

Causes and Reason for Check Engine Light Flashing and Car Shaking

Car shaking or vibrations often accompany a flashing check engine light. Several factors can contribute to this phenomenon, including:

1. Emissions-Control Related Misfires

A steady misfire in one or more cylinders of an engine can often be attributed to faulty or compromised emissions control devices. One common scenario is when the EGR (Exhaust Gas Recirculation) valve becomes stuck in the open position.

When this occurs, an excessive amount of exhaust gases is allowed to recirculate back into the engine’s intake system for re-combustion. As a result, the levels of oxygen saturation in the combustion chamber drop below the optimal range, hindering efficient combustion.

Such a misfire is more likely to occur randomly across different cylinders. This is because the excess exhaust gases are recirculated without discrimination among the engine’s cylinders.

2. Fuel System Issues

One of the frequent reasons for an engine misfire is the presence of faulty fuel injectors. A fuel injector can experience mechanical or electrical failure, causing it to fail in delivering the appropriate amount of fuel to a specific cylinder.

Consequently, without the necessary fuel for combustion, the affected cylinder lacks the catalyst required for power generation. As a result, this often leads to noticeable shaking that can be easily felt. Problems with the fuel injectors or fuel pump can disrupt the combustion process, leading to rough idling and shaking.

3. Ignition System Problems

Faulty spark plugs, ignition coils, or ignition timing issues can contribute to engine misfires and shaking. In an engine, the ignition power is transferred to a cylinder’s spark plug through a dedicated spark plug wire or a coil pack. which is utilized in engines equipped with a coil-on-plug ignition system.

Over time, due to engine-generated heat and general wear, the protective outer coating of these components can become fragile and develop cracks. As a result, the ignition power may leak or escape to the ground prematurely, causing potential ignition problems.

4. Mechanical Problems

Also, Worn-out engine components, such as damaged motor mounts or a failing crankshaft, can cause vibrations.


Practical Action to Take

If you encounter a flashing check engine light accompanied by car shaking, it’s crucial to act promptly. Follow these steps:

  • Safely pull over: Find a safe location to pull over and turn off the engine.
  • Check for visible issues: Inspect the engine bay for any obvious signs of damage, loose wires, or disconnected hoses.
  • Check fluid levels: Ensure that essential fluids like engine oil, coolant, and transmission fluid are at appropriate levels.
  • Avoid driving: It is recommended to avoid driving the vehicle until the issue is resolved to prevent further damage.
  •  Seek professional assistance: Contact a qualified mechanic or a dealership to diagnose and repair the problem. They have the expertise and diagnostic tools necessary to identify the root cause accurately.

Possible Repairs for Check Engine Light Flashing and Car shaking

The repairs required will depend on the underlying issue. Possible solutions may include:

  • Spark plug replacement
  •  Ignition coil replacement
  • Fuel system cleaning or repairs
  •  Engine sensor replacement
  •  Engine tune-up or mechanical repairs

A flashing check engine light and car shaking should never be ignored. These symptoms indicate a significant problem that demands immediate attention. By promptly addressing the issue and seeking professional help, you can prevent further damage, save on repair costs, and ensure your vehicle’s continued performance and safety on the road.

Remember, regular vehicle maintenance and timely repairs are key to keeping your car running smoothly and avoiding potential breakdowns.

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