What Is 7E8 Engine Code: How To Diagnose And Fix

You might use an OBD scanner to examine engine faults in numerous scenarios. It’s more likely that you will face one or more of the problems listed in the code.

But because it’s so unusual, codes like 7E8 can guide you on what to do when the screen shows this error.

Be at ease! The following parts will contain all the crucial details and advice on handling them!

7E8 Engine Code: What Is It?

What is meant by the engine code 7E8? When there is a problem with the emission system, namely with the loss of air pressure by the evaporative emission control system, code 7E8 appears.

What Is Meant by Code 7E8?

This 7E8 engine code is a generic number indicating a problem with your vehicle’s air or fuel intake system. As a result, you will see the Check Engine light coming on.

Furthermore, a momentary misinterpretation of a machine sensor could cause the Check Engine light to illuminate. When it coexists with error code 7EA, it can mean something different.

Nonetheless, you can use an OBD-II scanner at home to diagnose the problem independently. Specific tools will even recommend fixes you may perform in your garage.

Of course, to use this one, you must learn how to operate an OBD-II scanner.

Typical Symptoms

The Check Engine Light is the most noticeable of the few symptoms associated with this code.

Due to its potential for many coding interpretations, this signal may be misinterpreted, making it challenging to identify engine issues.

To ascertain the severity of the issue and the urgency of the solution, to save the machine, you must scan the code. In this case, the engine code 7E8 should be displayed by an OBD-II diagnostic tool.

Reduced performance or low mpg (mileage per gallon) are other signs of this problem. The automobile is under stress therefore you will notice a drop in power when the tachometer rises.

This results from an improper combustion air-fuel ratio (AFR). It may be underweight or excessively wealthy.

For mpg, the same is true. The machine will use more gasoline than usual if it does not get enough air to finish burning the fuel.

As a result, you will notice the darker smoke emanating from the exhaust pipe.

7E8 Engine Code

The Causes

Some of the following may be the reason behind their engine code 7E8 once you have determined it:

Broken Fuel Filler Cap

The fuel filling cap is an essential component of the vehicle’s evaporative emission control system. It prevents water and foreign objects from getting inside and corrupting the power and fuel from evaporating in the fuel tank.

Typical damage includes a persistent gas smell within the cabin, improper tightening, and an illuminated check engine light—all indicating a failed or damaged filler cap.

If it’s broken, it evaporates or has trouble controlling the air pressure inside the tank.

Fuel Tank Pressure Sensor (FTPS) damage

Another crucial component of an evaporative emission system is the FTPS, which keeps track of the system’s pressure.

The vehicle can detect evaporative leaks from damaged or loose gas or fuel caps.

When the EVAP emission system is operating, an erroneous engine data stream is sent to the engine control module by a malfunctioning FTPS.

Fuel Vapor Line Damage

The gas tank’s vapor pipes are used to return extra gasoline there for recirculation. Their main route is from the gas pump to the gas tank, where the vapor cools and condenses to become liquid gasoline.

If its vapor lines leak, come unplugged or are severed, there will be a significant loss. The engine code 7E8 could be caused by the machine running out of fuel.

Because so much gasoline is wasted due to exhaust leaks, this also results in poor fuel efficiency.

Fuel canister valve or damaged canister close valve

Charcoal is used in your car’s fuel canister to capture vapors that escape into space.

The purge valve (canister closure valve) returns the trapped vapor to the engine, where it is burned. They contribute to lowering air pollution in this way. A flawed one is useless for what it was designed to perform.

Fuel Pump Seal Breakage

A vehicle’s pump seal or gasket prevents fuel oil leaks to the cam case. In short, it closes the pump.

These leaks will result from problems that could lead to the machine running out of energy if you have a faulty seal. Moreover, this can activate the 7E8 code.

Poor Purge/Pressure Control: The solenoid valve

Its Elimination of Authority Your car’s solenoid valve is mostly in charge of controlling emissions. The charcoal canister holds the caught fuel vapors before they are put back into the machine.

When a malfunctioning one does not react to control signals, the system recognizes the issue.

How Can The Engine Code 7E8 Be Fixed?

Identifying the root reason and making the appropriate decision are necessary for handling this engine code. For your consideration, you can look at these fixes for the 7E8 engine code:

Reconnect, plug, or fix any leaky fuel vapor lines.

Any missing or damaged fuel filler caps should be replaced.

Fix the malfunctioning gasoline filler pipe.

Fix or swap out a damaged fuel canister.

Fix or swap out a malfunctioning FTPS.

Replace or repair a purge or pressure control solenoid valve that isn’t working properly.

If necessary, install new fuel pump seals.

How Is The Engine Code 7E8 Diagnosed?

The diagnostic code may be caused by visually inspecting the fuel system for leaks or by smelling for gasoline aromas inside the cabin. A fuel pump, line, etc., may need to be changed in this situation.

The best action is to check the code and find potential reasons or issues that need to be repaired utilizing a multipurpose OBD scanner. This procedure is easy to complete if you use the OBD tool.

It can take a while to diagnose engine code 7E8 due to many potential causes.

For this reason, you should bring your car to a technical mechanic with professional auto repair experience if you are not an experienced do-it-yourselfer.

What Is The Price Of Fixing A 7E8 Engine Code?

The emission control system in your car needs to be addressed immediately if the error 7E8 engine code flashes. A correct diagnosis might call for changing the vapor trapping device, such as a canister.

To seek assistance from a technical technician, it would be preferable to drive your vehicle to a reputable servicing facility. The initial repair cost to address these problems ranges from $400 to $606.

The labor costs in your location and the fees charged by each repair shop will affect this price.


What is a 7E8 Engine Code?

A 7E8 engine code is a generic control module code, often related to the engine or transmission. It’s not a fault code itself but a signal to investigate deeper into your vehicle’s system for more specific issues.

What causes a 7E8 Engine Code?

Common causes for the 7E8 code can include transmission issues, exhaust leaks, or a failing oxygen sensor.

How is a 7E8 Engine Code diagnosed?

An OBD-II scanner is used to diagnose the 7E8 code. It is plugged into your vehicle’s OBD-II port and used to read any stored codes that are causing the 7E8 code to appear.

What are the common issues related to a 7E8 Engine Code?

The 7E8 code can be an indication of several underlying problems like transmission issues, exhaust leaks, or a failing oxygen sensor. Symptoms may include a decrease in fuel efficiency, poor engine performance, or difficulty starting the car.

What is the cost of fixing a 7E8 Engine Code?

The cost can greatly vary depending on the specific issue. Simple sensor replacements might cost around $100, while more complex repairs like fixing transmission can run into thousands of dollars.

When should I seek professional help for a 7E8 Engine Code?

If the diagnosed problem is complex or if you’re not comfortable performing the repairs yourself, it’s advised to seek professional help. Experts can accurately and safely address the issue.

What happens if I ignore the Check Engine Light or a 7E8 Engine Code?

Ignoring these signals could lead to serious damage over time. The issue may worsen, severely affecting your car’s performance or even making it unsafe to drive.

How do I reset my car’s computer after fixing the 7E8 Engine Code?

Usually, the car’s computer is reset by disconnecting the battery for several minutes, then reconnecting it. The exact duration varies depending on your car’s make and model

What Would Happen If I Drive While the Check Engine Light Is On?

It is generally advised against driving a car with a Check Engine Light code displayed. It really is an emergency. It usually signals a malfunction in the machine.

You will likely harm the vehicle irreparably if you drive on, namely the catalytic converter.

Take your car to a nearby dairy repair shop if you are on your way and don’t know how to check. Professionals will help you identify and correct mistakes.

How Is The Check Engine Light Turned Off?

Here are four methods to follow if the Check Engine Light is intermittently flashing:

Using the OBD scanner to identify the fault code to clear this light.

Continue driving for a few minutes, allowing it to pass independently. This is appropriate if you diagnose and discover no problems.

To restart your automobile, turn the ignition on and off several times.

Reconnect the battery and use the ECM hard reset technique.


What engine code is 7E8? You already know everything there is to know about it!

Even though it isn’t considered a very harmful code, you should do a comprehensive scanning and exhaustive inspection to determine the engine flaws.

Seek assistance from auto mechanics or a third-party provider if you lack experience.

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