How To Fix P0457 Obd2 Code?

Affiliate Disclimer: ObdCore is reader supported, if you click on a link and make a purchase, We may receive commissions from purchases made via our links at no additional costs to you.

How To Fix P0457 Obd2 Code?
Table of Contents

Automobiles need two kinds of pollution controls: passive and active. The active component is concerned with fuel ratio regulation and the effectiveness of the catalytic converter to convert carbon monoxide, nitrogen oxides, and hydrocarbons into harmless water and carbon dioxide.

The Evaporative Emission (EVAP) Control System in vehicles is to prevent gasoline vapor, also known as hydrocarbons from being released into the atmosphere. When there is a vacuum leak in the system, the EVAP system interacts with the PCM, and one of three codes may be triggered: P0455, P0456, or P0457, depending on the severity of the leak. The OBD2 error code P0457 code is related to passive pollution control, and big leaks.

OBD2 Code P0457; What is it and what does it indicate?

This code indicates Evaporative Emission Control System Leak. It happens when the vehicle’s EVAP system fails to create enough vacuum due to a leak. 

OBD2 Code P0457; What is it and what does it indicate?

Error Code P0457: Symptoms, Causes & Fix

OBD2 P0457 Code Error; Causes

You can rule out a lot of lesser faults that would result in a P0455 or P0456 code since the P0457 code is only saved when there is a major leak. A P0457 code is stored in the majority of circumstances including;

  • A gas cap that is missing, fractured, or loose.
  • A hose that is fractured or rotting
  • A vacuum canister with a crack
  • Weathering or aging of system components and instruments will not trigger a P0457 or P0730 code since this system is sheltered from the elements. 

OBD2 Error Code P0457; Symptoms

A P0457 will not affect the vehicle’s performance or drivability in general, however,  you may notice a fall in fuel efficiency if the gasoline leak is big enough. You cannot solely rely on the lit Check Engine Light, as it indicates the issue. However, you may have to look out for symptoms or do a proper diagnosis. 

  • Illuminated Check Engine Light.
  • Noticeable fuel odor due to the discharge of fuel vapors

OBD2 P0457 Code Error; Diagnosis

If you wish to quickly diagnose the root cause of the P0457 OBD2 error code, here are a few steps you can perform. 

  • First and foremost, examine the gasoline cap, tighten it, clear the code, and reset the engine computer for an EVAP code.
  • After that, try the car to see if the code appears again. If not, it’s simply another example of “loose gas cap syndrome,” as they call it. 
  • If the issue continues, the fuel tank pressure sensor might be the source of the problem.
  • Look at the fuel tank pressure readings with a professional OBD-II scanner to verify whether the engine computer is reading suction from the sensor.
  • If not, before replacing the pressure sensor, verify the wiring from the sensor to ensure there isn’t a communication issue.
  • Inspect the PCM for defects and replace or reprogram it as needed.

A malfunction in the PCM may sometimes cause the system to store the erroneous error code or several error codes. Therefore, a thorough examination of all components is necessary.

Mistakes to avoid when diagnosing the P0457 Code

Before replacing any sensors and other components, it is important to check for loose caps and broken valves, as well as bad cabling. On the other hand, an incorrect diagnosis can lead to unnecessary replacements and leave the issue unresolved. 

  • Examine the wiring and connections for any issues.
  • Sensors and gasoline pumps that aren’t working properly.
  • Errors with EVAP canister valves.
  • Failure of the Powertrain Control Module.
  • The pressure sensor in the fuel tank is broken.
  • Faulty pressure sensor connectors.
  • The filler neck on a fuel tank is a concern.

How To Fix P0457 Obd2 code (Evaporative Emission Control System Leak Detected)

How To Fix P0457 Evaporative Emission Control System Leak Detected

Along with other repairs and replacements, the most frequent fix for the po457 code is to make sure the gas cap is correctly tightened or to replace it entirely. 

  • The fuel tank pressure sensor needs to be fixed or replaced
  • Fix or replace the gasoline tank pressure sensors if it is damaged.
  • One or more suction hoses in the evaporative emission control system must be replaced.
  • Ensure the intake manifold’s fitting is sealed and free of cracks, and replace it if necessary.
  • If the charcoal canister exhibits symptoms of cracking, it should be replaced.


How much does an EVAP system leak repair cost?

You can expect costs ranging between $200 to $560 for the EVAP system big leak. That is to say, the components or the parts cost more than half of the total price. The labor for the repair is most commonly between $35 to $140, with certain components costing between $150 and $440.

Will the EVAP code be clear on its own?

No, that is not the case. To clear the code, you must diagnose the problem and resolve the issue. However, if it’s caused by a minor flaw that goes away is fine, but if the condition indicates a more serious issue, it will not go away on its own. 

Can I drive with an EVAP leak?

There is nothing that prevents you from driving while your EVAP is leaking. However, traveling when petrol fumes are filling the cabin or the area around the car, is not a wiser decision. On the other hand, prolonging the issues can lead to more serious issues in the future that can cost you even more. 

How do distinguish between a small or a big leak in the EVAP system?

If your vehicle is illuminating check the engine light, and you must perform a scanning test to find out the code. P0456 and P0457 relate to the same issue, however, P0456 depicts a leak smaller than 0.020” in diameter, unlike P0457. 

Where is the EVAP vent valve located?

Depending on the make, type, and model of your vehicle, the EVAP vent valve is often located below the car, near or at the charcoal canister. You will find the charcoal canister located near the fuel tank.