Question about 1994 Buick LeSabre

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Check engine soon light. diagnosed as troble shooting codepo44

Probable causes defective or loose fuel cap,evap canister or hose cracked-not connected,purge or vent selenoid defective,vacum leak at engine.Every thing appears to be ok. check all hoses and connection,replaced fuel cap,What is the next thing that would you sugest checking? I wonder about the purge or vent solenoid. Is the purge or vent selenoid the same or two differnt components?

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  • Anonymous Mar 29, 2009

    i have a 2000 pontiac gramd am. I was wondering if the EVAP canister is located beside my mastercylinder? I had it checked at auto zone, and the codes came up : defective or loose fuel cap

    : EVAP canister or hose cracked- not conect.

    : Purge or vent solenoid defective

    : Vacuum leak at engine

    so what does this mean? do i need to change the EVAP canister? or solenoid?... can someone help me please


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Change the evap vent solenoid canister located near the master cylinder on the right side of the engine or your hoses may be cracked. Good luck!

Posted on Mar 12, 2009

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Replaced head gasket. now check engine light is on with a p0442 code. are there any evap hoses that I can inspect for cracks or damge since the gasket was replaced.

Tom, Yes, you should check all evap hoses for cracks and leaks.
Common Problems That Trigger the P0442 Code
  • Defective or damaged fuel cap
  • Distorted or damaged Fuel Tank Filler Neck
  • Small tear or puncture in the Evaporative system hose(s) and/or Carbon Canister
  • Defective Fuel Tank Sending Unit gasket or seal
  • Small split in a seam of the Carbon Canister
  • Defective Evaporative Vent Valve and/or Evaporative Purge Valve
  • Defective or damaged Fuel Tank
  • Defective Fuel Tank Pressure Sensor
  • Defective Leak Detection Pump
  • Slightly loose and/or worn clamps or hardened O-rings anywhere in the EVAP system Check the attached links,
    "I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
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Mar 10, 2016 | 2000 Chevrolet Malibu

1 Answer

Computer code 455

Possible causes - Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking The P0455 it's a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes.

When is the code detected? EVAP control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly. Possible symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors P0455 Buick 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.
if tightening the cap or replacing the cap does not help take your car to a shop to have it diagnosed as it requires special tools/equipment to test this and get an accurate results to find what needs replacing.

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2 Answers

Obd code p0457 fuel cap replaced mil reset defect not cleared connection checked ok

The code is for a large leak in the EVAP system such as a loose or missing gas cap. But it could also mean a loose or missing hose to the canister or other leak in the tank.
The computer vents the tank several times an hour while the engine is running, and it checks the system by pressurizing the gas tank. If the tank will not hold pressure the code is set.
You may have to check the top of the tank where the fuel pump gasket is, as well as the vent lines to the front of the car.
A mechanic would perform a smoke test to look for leaks.

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P0456 error code on a 2003 Mits. Galant

P0456 = "Evaporative emission (EVAP) control system leak detected (very small leak)."

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The error code PO440 comes up about two weeks after clearing. Checked the hoses, all looked great. The fuel cap o-ring looks good and the sealing ring on the gas filler look good, What do you suggest?...

Try checking The last two on the list.
    P0440 Generic Definition

    EVAP (Evaporative Emission System) small leak/no flow condition
    - The Evaporative Emission system is monitored for it's ability to hold vacuum.

    Probable Cause[s]

    1. Defective or loose fuel cap
    2. EVAP canister or hose cracked-not connected
    3. Purge or vent solenoid defective
    4. Vacuum leak at engine

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    What is code 455 (Check engine soon light) on my 2004 Chevy Trailblazer, 4.2l


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    Message comes up P440

    po440 is emission control system malfunction, Probable Causes:
    a) Defective or loose fuel cap
    b) EVAP Canister or hose cracked- not connected
    c) Purge or vent solenoid defective
    d) Vacuum leak at engine.

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    2002 chevy cavalier p0440 and service light is on

    that is fuel tank evap related code.
    It can be caused by simply removing the gas cap while the engine is running.
    Dont get too concerned with this code if you think you may have opened the cap while car was running, the computer will soon turn the light off if all is well.
    Other things Like ta cracked or faulty gas cap, The evap purge canister or hoses loose or cracked, filler neck hoses loose or cracked ,damaged orings on evap sensor. could also cause this code.
    They often use a special smoke machine to diagnose leaks in the tank and evap system.
    The special machine fills tank with smoke at 2 psi making it posible to spot leaks.
    Hope this helps.
    If it does dont forget to leave a comment.

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    I have a 2003 Mitsubishi Eclipse with a P0442 code small evap emission control system leak What are some of causes,and how would I trouble shoot

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