Question about 2009 Chevrolet Silverado 1500

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Check engine light came on diaognsics say leak

Took to auto zone diagnostic test saidECM has detected large leak in the EVAP

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If you have a EVAP code and no broken hoses or vacum lines then to find the leak will be a daunting task. Best will be to get a Smoke test done. Smoke test is done by forcing smoke in the Gas tank and then wait for it to escape from the point it leaks out and fix that leak or replace the component.

Posted on Mar 23, 2015

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Evap system has many parts , cannister,vent and purge valves ,fuel tank and cap, first is the fuel cap on and is the seal in good shape. You will need to inspect all vauum hoses that leave the cannister if all ok then get the valve and solenoid tested for stuck open

Posted on Mar 23, 2015

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Posted on Jan 02, 2017

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SOURCE: check engine light remaining on all the time.

Replace the oxygen sensor

Posted on Jul 21, 2009

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SOURCE: The check engine light is on chevy cavalier 2001

The check engine light would record an error code in the computer, you need to get that information in order to know what the next step is.

Posted on Oct 11, 2009

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SOURCE: Received P0455 Evap System Large Leak Detected - 2004 Cavalier

your problem is probably a vacuum hose that goes from the purge valve to the gas tank (crack or broken hose). There should be two of these check both. A broken vacuum line will make the purge valve make a clicking noise that can be mistaken for noisy engine valves.

Posted on Apr 28, 2010

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SOURCE: 08 Impala - Check engine lite on - Large Evap leak detected

If it is missing or not running perfectly you can damage the Oxygen sensors or the catalytic converter. If it is running perfectly then more than likely no damage will be done, but you still need to have it looked at by a professional with the proper tools and skill to diagnosis the problem and not just throw parts at it. The PCM and catalytic converter are covered by an 8 year 80,000 mile warranty whichever comes first. To know if your defect is covered which is highly unlikely, you need to talk to your local GM dealer.

Posted on Jun 07, 2010

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czaa
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SOURCE: evap large leak detected. troubleshoot

the charcoal canister that absorbs the fumes is in engine area-u see a hose attached to it ina corner--inspect hose rite down to the gas tank as well as all parts of system--itz an EPA thing and doesnt effect car performance

Posted on Oct 05, 2010

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1 Answer

When Engine light came on 2009 Mercury Sable and got P0442 diagnostic code so how bad is diagnostic and how costly to fix?


code p0442 refers to evaporative emission system(EVAP)--small leak detected==causes-- hose connections,--intake leak--EVAP canister--EVAP canister purge valve
it also refers to large leak detected ( loose fuel cap/missing cap) causes--mechanical fault--hose connections---EVAP pressure sensor
If it has just started then check that the fuel cap is on tight or replace the pressure sensor or lastly ( it will probably the most expensive) the purge valve.

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How to repair engine code po442 2009 mazda 5?


Check the purge solenoid under the hood common problem in mazda 5 6 cx7.

Jul 11, 2014 | Mazda Cars & Trucks

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Check Engine Light appeared; diagnostics resulted in PO455 code


If you Googled the code, you would find you
have an Evap System Gross Leak

If the gas cap was just loose the light will go out

The evap monitor only runs every few days,so
you may have to wait & see

I think you need to smoke the system & find the
route cause,vent solenoid,pressure solenoid,etc

Apr 05, 2013 | 2006 Ford F-150

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My engine lite is on and took it to auto zone they checked it and said it was p0455 evap emission control system system leak,large...how do i fix it without taking it to a shop?


Do you know where the leak is ,or what is causing it?
Check all the EVAP hoses in the system.
Pretty hard to test without,pressure,vacuum or smoke machine and system knowledge

May 04, 2010 | 2004 Chevrolet Monte Carlo

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2004 Mazda RX-8 PO455


It will not go off by itself,you will need to reset it by connecting to a diagnostic tool.Once cleared if there is any other problem then it will trigger the check engine light again.Hope this helps..

Sep 03, 2009 | 2004 Mazda RX-8

1 Answer

Failed Emision test


po442 is evap emission control system leak (small) 1 of the lines for emissions is leaking. po455 is-- emission control system leak (large). turn off light with code scanner after it is fixed.

Sep 01, 2009 | 2001 Dodge Caravan

1 Answer

My check engine light came on on my dodge truck so I took it to get a free computer reading at auto zone & it showed that I have an evap valve leak! A small on as well as a large one, anyone know what...


in reference to the evap leak, it very well could be your filler neck. it could have rusted a hole in it. look underneath where you fill your gas and see if there is rust or if you smell gas the small one could be the evap cannister

Jun 20, 2009 | 2001 Dodge Ram 2500 Truck

2 Answers

I have a 2003 dodge ram 1500 with a V-8 4.7 engine and my check engine light came on with a P0456 code and I have been told that it could be the gas cap, I have checked it and it seems fine but should I...


The leak in your evap system is very small at .020. It is more than likely a small split in a hose somewhere. The cap is probably ok, we rarely find a bad one. If it is a small split in a hose it will only get larger over time. Here is the factory info on the code. We have found that alot of these leaks are from a small hose on the evap canister under the vehicle, but with out looking at your vehicle it is hard to say. If the leak goes away or is no longer large enough to be detected, your light will go out after a few days. These leaks are emmissions related and will not effect the integrity of the vehicle. I would have it checked and corrected if the light stays on at your convienience.

Symptom List:
P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED
P0455-EVAP LEAK MONITOR LARGE LEAK DETECTED
P0456-EVAP LEAK MONITOR SMALL (.020) LEAK DETECTED
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0442-EVAP LEAK MONITOR
MEDIUM (0.040) LEAK DETECTED.
When Monitored and Set Condition:
P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: If there is a leak larger than 0.0409 and smaller than 0.0809 in the
evaporative system.
P0455-EVAP LEAK MONITOR LARGE LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: There is a leak larger than 0.0809 in the evaporative system.
P0456-EVAP LEAK MONITOR SMALL (.020) LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: There is a leak larger than 0.0209 and smaller than 0.0409 in the
evaporative system.
POSSIBLE CAUSES
LEAK AT GAS CAP
VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
VISUAL AND PHYSICAL INSPECTION
VERIFY EVAPORATIVE EMISSION SYSTEM LEAK
EVAP PURGE SOLENOID OPERATION
INTERMITTENT LDP MONITOR FAILURE
EVAPORATIVE EMISSION LEAK DETECTION
GAS CAP
LDP COMPONENT LEAK

Jun 12, 2009 | 2003 Dodge Ram Maxi

5 Answers

2001 Dodge Caravan/check engine light


P0442--Evap Emission Sys. leak detected small leak
P0455--Evap Emission sys. leak detected gross leak
P0456--Evap Emission Sys. leak detected very small leak

Jun 07, 2008 | 2001 Dodge Caravan

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