Question about 2001 Jeep Grand Cherokee

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Engine light on.engine read out say's it's a vacuum leak.replaced the gas cap engine light still on. what could be the cause?

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Well, it is most likely a vacuum leak *somewhere*. Open the hood, look around carefully for any cracked, broken, or disconnected vacuum lines (these are usually about 1/4 inch in diameter, black rubber hoses, sometimes 1/8 inch diameter rigid black plastic tubing). Often one or more goes to the firewall to control the a/c dampers, make sure that the air comes out of the defrost vents, the dash vents, and the floor vents according to the knob settings, if not, look for the engine to dash hose.

Posted on Sep 01, 2010

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I would like to know what the code PO455 on a 2007 Mitsubishi Endeavor means.


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
help.jpg What does this mean? Tech notes
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.
help.jpg What does this mean? When is the code detected?
Evaporative Emission System (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 Mitsubishi 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.

Read more: http://engine-codes.com/p0455_mitsubishi.html#ixzz3NlVyARyX

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Dec 30, 2014 | Cars & Trucks

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.

Oct 10, 2014 | 2004 Buick LeSabre

3 Answers

Runs good engine lt on code p0455


A loose gas cap or bad gas cap can cause this ,or filling gas tank while it running .or it could be a small leak in the evap system

Apr 21, 2014 | 2003 Jeep Wrangler

1 Answer

Check engine light on codes p0442 p0456 p0513


P0442 and P0456 are both evaporative emission error codes due to a small leak. The most common cause is a leaking gas cap or hose leak on that system. I did not list a code for your 0513. I am sending you a little information about your problem.. Best of Luck to you..


2003 Lexus RX300 3.0L 2003 Toyota Sienna 3.0L 2003 Toyota Highlander 3.0L, Eng Cfg V6, Eng Des 1MZFE, USA/Canada 2004 Toyota Avalon XL 3.0L
Check engine light is on with trouble codes P0442 and P0456. The codes are evaporative system small leak codes.
1. Verify that the gas cap is a factory Toyota gas cap and visually inspect that all hoses and lines are tight and connected.

2. Locate the canister closed solenoid and the vacuum switching valve on the canister. Manually ground them and verify that they operate and function. The canister closed solenoid is normally open and should close when grounded. The vacuum switching valve on the canister is normally closed and needs to open when grounded.

3. Verify that the hoses are not loose or pulled off the canister closed valve on the air cleaner housing. This has been a common problem on some models.

4. If no problem is found, the next step is to ground the canister closed solenoid and the vacuum switching valve under the vehicle and simulate an evaporative test and verify that the system holds a vacuum and functions normally. When the solenoids are grounded, back probe the Blue/Black (L/B) wire on the pressure sensor, and with no vacuum or pressure, the voltage should read around 3.3 volts. Start up the vehicle and turn on the purge vacuum switching valve and use engine vacuum to draw down the system to around 2 volts on the pressure sensor. If the voltage does not increase rapidly, there is no problem. If the voltage increases quickly, look for the leak in the evaporative system. Potential Causes: Canister Closed Valve
Disconnected Canister Closed Valve (CCV) Hose
Gas Cap
Harness
Vacuum Switching Valve - For the pressure sensor.

Aug 21, 2011 | 2002 Lexus ES 300

1 Answer

Hi, I have a scanner cause engine light is on, shows vacuum leak large. tried new gas cap, cleaned filler tube where gas cap contacts, replaced a plastic tube from valve cover to air filter hose. tried to...


what code is it?po440,p0455?If it is one of those codes it means you have a large evap system leak not a vacuum leak by the engine.the evap leak is most likely a inop vent valve or a fuel cap not properly sealing.

Apr 13, 2011 | 2005 Chevrolet Uplander

3 Answers

P0456 error code on a 2003 Mits. Galant


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

Feb 25, 2011 | Mitsubishi Galant Cars & Trucks

1 Answer

I have a 2000 Saturn SL1 that would start out fine in the moring but by the time I drove 25 miles to work it would be idling at 3000 and stick there or come down VERY slowly. I replace the ICV. Still had...


Sounds like a vacuum leak at the canister or vacuum lines, lift the hood, start the car and listen for a hissing sound after it warms up, on the fender/frontend area there should be a black canister with vacuum hoses connected, check all the hoses end to end for leaks, there is a vacuum that is created in the tank that is controled (vented gas cap), if there is no vacuum in the canister to the fuel tank, this will cause the check engine light to come on (faulty gas cap). vacuum leaks cause the RPM to increase, I am surprized that's the only code you have. most cars have a diagram under the hood of the emissions.

Dec 28, 2010 | Saturn SL1 Cars & Trucks

1 Answer

Got scan problem numbr P0442 Check engine is


Po442 is an evap leak, this is the fumes from the gas tank, check vacuum lines from engine compartment for any cracks or splits also make sure gas cap is tight and gasket is good, most of the time this is caused from a bad fuel cap, i would replace the gas cap make sure its on tight then drive for a week if the light goes out then problem solved if light is still on after a week of driving then there a leak is the system. hope this helps.

Aug 30, 2010 | 2005 Dodge Grand Caravan

1 Answer

Can you explain how the gas cap can cause a service engine light to come on in a 2006 chevy uplander with a 3.5L engine.


The gas tank and emissions are under vaccum and a loose/bad seal or missing gas cap allows the vacuum to leak out when the pcm detects irregular vacuum it will turn the service engine light on.

Jul 06, 2010 | 2006 Chevrolet Uplander

2 Answers

Check engine light on DTC P0456


P0456 is a code set when there is a very small leak (theres very small leak, small leak and a couple of others, your code indicates the smallest level of leaking). This can be caused by a vacuum line that is cracked or otherwise leaking on the evaporative (EVAP) system. It could even be from a gas cap that is not sealing properly, though typically a gas cap leak tends to set code P0441. Just the same, and since it is the cheaper way to go, start by replacing the gas cap and see if that clears the code and any check engine light you may have.

Once you replace the gas cap you may need to disconnect the battery for a couple minutes to reset everything if you dont have access to a scanner that can do it.

Jan 01, 2009 | 2004 Kia Amanti

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