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P0457 Code: What Does It Mean?

February 23, 2024 | Victor Lukasso

Are you familiar with the P0457 code? If not, keep reading to learn what it means and how to save money on repairs by fixing the problem yourself.

Knowing the minor body parts of your car is crucial, as it allows you to detect issues early on and fix them before they become more severe or complicated.

What Does the P0457 Code Mean?

When your car’s powertrain control module (PCM) detects a leak in the EVAP system, it sets off the diagnostic trouble code (DTC) P0457, which stands for “Evaporative Emission System Leak Detected (Fuel Cap Loose/Off).” This particular code is usually caused by a fuel cap that is either missing or not tightened properly.


What Does the EVAP System Do?

The EVAP system prevents fuel vapor from escaping into the atmosphere.

EVAP system features the following primary components:

  1. Fuel tank
  2. Gas cap
  3. A pressure sensor that moderates the pressure in the fuel tank
  4. A charcoal container that holds the fuel vapor
  5. A purge valve
  6. A vent valve that closes during system testing
  7. Hoses and lines that connect the system.
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Its primary component is the charcoal canister, which absorbs fuel vapors when the engine is turned off.

When the engine is running and conditions are appropriate, the powertrain control module (PCM) opens the purge valve, allowing the vapors to be drawn into the engine and burned during combustion.

Modern vehicles built after 1996 have an Enhanced Evaporative Emissions Control System, which allows the PCM to test the EVAP system for purge flow and leakage. If a leak is detected, the PCM generates a diagnostic fault code.

The most common cause of an EVAP system leak is a loose gas cap that fails to seal correctly against the filler neck. If the PCM detects an EVAP system leak after refueling, it will assume that the gas cap was not tightened properly and trigger the P0457 code.

However, a significant leak in the EVAP system can also trigger this code.

P0457 FORD Possible Causes

  1. Missing fuel filler cap
  2. Incorrect fuel filler cap used
  3. The fuel filler cap remains open or fails to close
  4. Foreign objects caught in the fuel filler cap

What are P0457 FORD code possible symptoms?

  • Engine Light ON (or Service Engine showing Warning Light)
  • A noticeable fuel odor caused by the release of fuel vapors
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How Can You Fix the P0457 Code

If you are not a mechanic, you can still resolve the P0457 code issue by tightening or replacing your car’s gas cap. However, if this solution does not work, you must troubleshoot to identify the major causes of the EVAP leak.

In some cases, seeking the services of a professional mechanic or other professionals may be necessary to fix the problem correctly and effectively and prevent additional or severe damages.

It is essential to note that different vehicles have unique characteristics, and fixing a P0457 code issue in a Toyota will differ from setting it in a Nissan or Honda.

Before repairing or troubleshooting diagnostic trouble codes, consult your manufacturer’s guide or a professional mechanic for assistance. Repair manuals like those from Chilton can be helpful, but an ALLDATA subscription is a better option. ALLDATA offers DIYers single-vehicle subscriptions, providing them with detailed factory repair information.

Cost of Diagnosing P0457 FORD code

Diagnosing the P0457 code in your Ford vehicle typically takes one hour of labor. The labor cost for auto repairs is determined by various factors, including your location, the make and model of your vehicle, and the type of engine you have. Auto repair shops may charge between $75 and $150 per hour.

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Q: What are P0457 SUBARU code possible symptoms?

  • Engine Light ON (or Service Engine showing Warning Light)
  • Noticeable fuel odor caused by the release of fuel vapors.

Q: What are the Possible Causes of the P0457 SUBARU Code?

  • Missing fuel filler cap
  • Incorrect fuel filler cap used
  • The fuel filler cap is open or fails to close
  • Foreign objects in fuel filler cap.

Q: How to Fix the P0457 SUBARU Code?

To address the P0457 code in your SUBARU, the first step is to inspect the possible causes. Start by visually examining the wiring harness and connectors related to the issue. Check for damaged components and inspect connector pins for corrosion, bending, or dislodging.

Q: What is the cost to diagnose the P0457 SUBARU code?

The cost of diagnosing the P0457 SUBARU code typically involves 1.0 hours of labor. However, the cost of repair diagnosis and labor rates vary depending on your location, the vehicle make and model, and engine type. Auto repair shops generally charge between $75 and $150 per hour.

In Conclusion

The information provided in this article can be applied to diagnose, fix, and identify causes and symptoms of the P0457 engine code for different vehicle brands, including the PO457 Jeep.

However, before carrying out any further repair or troubleshooting for P0457, it is crucial to contact your vehicle manufacturer or factory for guidance.


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Meet Victor Lukasso, the owner of V. Auto Basics. Through this blog, Victor Provides Insights on the latest tips, maintenance, repair, and techniques in the automotive world.