Chevy’s Check Engine Light Flashes And Then Stops – 10 Causes

Written By: Terrence Hines
Category: Engine

If Chevy’s check engine light flashes and then stop, it is important to figure out why. The reasons could be different, so you need to understand the exact reason to fix the problem.

Chevy’s check engine light comes on as a warning when something is not working right. Learning what these warnings mean and what to do about them is important.

Chevy’s Check Engine Light Flashes And Then Stops – 10 Common Causes

Don’t be alarmed if you’re a Chevy owner and the check engine light starts to blink – take it as an opportunity to get your vehicle checked out!

It’s possible that the light is indicating a serious problem that needs to be remedied quickly—or it could mean something simple like an oxygen sensor needs to be replaced.

It’s essential to address the issue quickly and thoroughly, regardless of the results.

Some Chevy owners have found success by scanning their cars for possible error codes that can provide more details about what is causing the light to flash.

Taking this step could be advantageous in resolving your problem efficiently and successfully. To resolve your car troubles, visit your neighborhood’s Chevy dealership or auto mechanic.

They are well-equipped with all diagnostic tools and resources to determine what is causing the problem and how it should be fixed efficiently.

1. Engine Misfiring:

If you’re driving and your Chevy’s check engine light flashes and then stops, this indicates engine misfiring.

Chevy's check engine light flashes and then stop

Diagnosing engine misfiring can be a major headache without the right tools. Fortunately, proper diagnosis is within reach with the correct equipment.

When an engine misfires, the cylinder where a spark plug cannot ignite the explosive mixture of air and fuel ceases to generate power.

Consequently, your car may stumble or stop running as its combustion cycle is disrupted.

It’s important to remember that if left unattended for an extended period, engine misfiring can result in catastrophic damage – such as spark plug or catalytic converter failure.

While it might not seem critical, overlooking this red flag could cost you more than money.

If you own a Chevy, take it to a qualified technician immediately after the engine light starts flashing. This will help fix any problems before they get worse.

2. Loose Fuel Cap:

A loose fuel cap could cause Chevy’s check engine to light flash and stop.

If the fuel nozzle is left unsealed, air can leak into the system and cause the engine to misfire or decrease efficiency due to incorrect fuel transmission.

Plus, small gasoline droplets with vapor can cause harm because they can catch on fire. They may also make holes in a hose if not cared for.

Regular inspections of all components, including the filler neck, are paramount for optimal Chevy’s check engine light performance and efficiency.

Any leakage or improper sealing signs should be immediately addressed to ensure peak operation.

Doing this will guarantee a smooth running engine and prevent any impromptu breakdowns.

Taking preventative maintenance measures like these will help you avoid any future unpleasant surprises.

3. Faulty Oxygen Sensor:

If Chevy’s check engine light flashes and then stop, it could be related to a faulty oxygen sensor.

The oxygen sensor is an electronic device that monitors the air-to-fuel ratio in a vehicle’s engine, sending data to the ECU computer that adjusts accordingly.

If you experience poor performance, heightened emissions levels, or a spike in your fuel consumption, it’s likely due to a malfunctioning oxygen sensor.

To rectify the problem and ensure the optimal functioning of your vehicle, you must replace the defective part as soon as possible.

Depending on your Chevy model, you may require different types of oxygen sensors for installation.

 Faulty Oxygen Sensor

Thankfully, Chevy replacement parts and kits are widely available from major retailers, so drivers can replace their faulty oxygen sensors and get back on the road quickly.

4. Catalytic Converter Failure:

If your Chevy’s check engine light flashes and then stops, there could be a malfunction in the catalytic converter.

This component plays an essential role in maintaining optimal air-fuel mixtures for emissions.

If the catalytic converter reaches its end of life, it can send signals or codes to Chevy’s onboard computer due to extreme temperature fluctuation or deteriorated performance.

The Chevy diagnostic tool is your go-to for detecting and troubleshooting any potential issues with the device. Signs that something may be going wrong?

Poor fuel economy, a rattle emanating from under the hood, or excess exhaust fumes are all clues that could lead to bigger problems later on.

Investing in this service now will save you time and money! It is important to address these issues immediately, as they can lead to further damage.

5. Ignition Coil Failure:

Ignition coil failure is one of the most common causes of situations where Chevy’s check engine light flashes and then stops.

The ignition coil is responsible for converting the low voltage of a car battery into high voltage to feed the engine spark plugs.

A failing coil can create an error code and disrupt the ratio of fuel to air in your combustion, resulting in a less efficient process.

This will cause the computer to record this degraded performance and produce a blinking check engine light as a warning.

While it can be inconvenient or costly to have this part repaired, ignoring such an issue can cause additional wear on the engine, decrease overall performance and reduce fuel economy.

6. Spark Plug Failure:

If left unresolved, a failed spark plug in your Chevy can make its presence known with the dreaded flashing check engine light.

Additionally, this malfunctioning or worn-out part could decrease power and fuel efficiency – an annoyance no one wants to deal with!

Chevy drivers will likely see the check engine light disappear eventually, but rather than being relieved, they should prepare for a long road ahead as this is probably only temporary.

Therefore, Chevy owners should act fast and take their vehicle to an authorized technician for a correct assessment, and the essential repairs can be done expeditiously.

This will aid in managing any unresolved problems related to spark plugs malfunctioning.

7. Clogged Fuel Filter:

Chevy models may experience a check engine light flashing for short periods, usually due to a clogged fuel filter.

The fuel filter prevents dirt and impurities from entering the fuel system to ensure your Chevy’s engine continues operating at its highest efficiency level.

Chevy's Check Engine Light Flashes And Then Stop - 10 Common Causes

Over time, this filter can become filled with contaminants, leading to decreased performance and the flashing check engine light.

If you want to maintain your Chevy’s engine in its best condition, it is essential that you promptly replace the clogged fuel filter so that your car can get back up to par.

Skipping this step could cause significant damage and significantly reduce its performance level.

8. Dirty Air Filter:

If your Chevy’s check engine light flashes and then stops; you may need to replace your air filter.

Dirty air filters can clog up the plenum of your Chevy, blocking fresh air from reaching components in the engine.

The symptom is usually the check engine light going on and off temporarily because Chevy’s computer can’t recognize when there’s a lack of airflow.

To ensure your Chevy runs properly, you should regularly change or clean your air filter; most Chevy owners recommend doing it every 15,000 to 30,000 miles.

If you’re uncertain how to do this, refer to your Chevy owner’s manual for instructions or consult a car service professional for help.

9. Leaking Coolant System:

If you have a Chevy and your check engine light is flashing and quickly stops, it could be due to a cooling system leak.

This is especially the case if your engine overheats frequently or there’s an excessive buildup of white steam coming from the exhaust pipe.

When your coolant system is compromised, the pressurized liquid can escape through multiple areas, such as seals and gaskets, or even cracks in the radiator!

As these components slowly degrade over time, they become more prone to leaks which can disable the engine if unresolved.

For this reason, it’s important to immediately inspect and fix any potential problems before serious damage is done to your Chevy’s engine.

10. Stuck Throttle Body Or EGR Valve:

Chevy drivers may find themselves confronting when Chevy’s check engine light flashes and then stop. In some cases, what is causing the problem is a stuck throttle body or EGR valve.

The Chevy’s electronic system will detect this as an engine misfire and send a signal to the car’s computer that illuminates the dash warning light but won’t necessarily indicate a precise cause.

If you want to know if Chevrolet’s electronic and powertrain systems are working well, you can investigate the throttle body and exhaust gas recirculation (EGR) valve.

If either of these parts is not working, it must be cleaned or repaired.

Stuck Throttle Body Or EGR Valve

To ensure that your Chevy remains in optimal condition, paying close attention to the dashboard notifications is essential—especially if you notice the engine light keeps flashing during startup.

Moreover, enlisting a certified technician for regular maintenance and repairs will guarantee that your car runs smoothly and efficiently over time.


Chevy’s check engine light flashes, and then stops is a symptom indicating a few different things.

When your Chevy’s check engine light flashes and fades, it could mean something minor, like a faulty oxygen or air pressure sensor requiring resetting.

Be aware that prompt action could be necessary to avoid additional damage, as this issue may have something to do with emissions and the catalytic converter.

It’s always best to have any issue regarding the Chevy check engine light checked out by an expert mechanic who can diagnose the cause.

Ultimately, knowing the cause and getting it fixed immediately is important for maintaining your Chevy’s good performance and avoiding further damage or injury.

Terrence Hines

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