The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed." property="og:description">
For Shop Owners

P0457 JEEP - EVAP System Loose Fuel Cap

Repair Importance Level: 1/3
Repair Difficulty Level: 3/3 What does this mean?

Possible causes

  • Damaged, missing or loosely installed fuel filler cap
What does this mean?

Tech notes

Check for a loose, missing or damage fuel filler the cap.
What does this mean?

When is the code detected?

EVAP control system has a very large leak such as fuel filler cap fell off

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible a noticeable fuel odor caused by the release of fuel vapors
  • Fuel cap indicator lamp (FCIL) may be illuminated.

P0457 JEEP Description

This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition.

The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.

OBDII Code P0457 Jeep - EVAP System Loose Fuel Cap - itimaster.ru

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Repair Importance Level: 1
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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