Question about 2003 Chevrolet Silverado 1500

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I have a 2003 Chevy silverado and I'm getting a p0455 code, what's does that mean

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P0455 Evaporative Emission System Leak Detected (large leak)
The large leak detected could be in a hose or connector leading to the front under the hood evaporative canister.

It is not a loose gas cap, though.

Posted on Oct 08, 2010

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Posted on Jan 02, 2017

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SOURCE: 2006 5.3ltr chevy silverado z71 p0455 andp0449

These codes are for the evaporative emission system.The 455 is the vent solenoid.The 455 is a large leak in the evap.system.The vent solenoid I would replace because they go bad and will not work because they are under the vehicle in the rear of the truck.There is a bulletin for these and the vent valve is installed in another spot.The number for the bulletin is 02-06-04-037E.You should also look for a broken or loose hose or pipe that might have came off.Specially if you ran over something.If none found it could just be the vent solenoid stuck in the venting position.Good luck.

Posted on Dec 01, 2009

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1 Answer

2005 chevy 1500 silverado eng. light on ran code p0455 and p0449 how to fix the problem. and how much work it takes. thanks STEVE.


P0449 is the evap vent valve solenoid circuit malfuntion.
P0455 is an evap gross leak
Perhaps the gross leak code has to do with the vent valve. Find the vent valve. It should be near a rectangle evap canister. Maybe under the bed. The small vent line from the fuel tank will go to it. The solenoid is near the cansiter. With the key off the valve will be open. With the key on it should be closed. You may try disconnection the hose and blow through it with both key off and on and see if air will pass through. If the valve has died and is stuck open, that can be the huge leak.

If it is not the leak then a smoke machine should be used. Easier than searching the lines for bad o-rings, splits, or whatevers.

Sep 02, 2011 | 2005 Chevrolet Silverado 1500 2WD

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Need the unlock code for chevy silverado 2003


the only way to get the right code is to contact your local dealership and get it from them

Mar 09, 2010 | 2003 Chevrolet Silverado 1500

1 Answer

2006 5.3ltr chevy silverado z71 p0455 andp0449


These codes are for the evaporative emission system.The 455 is the vent solenoid.The 455 is a large leak in the evap.system.The vent solenoid I would replace because they go bad and will not work because they are under the vehicle in the rear of the truck.There is a bulletin for these and the vent valve is installed in another spot.The number for the bulletin is 02-06-04-037E.You should also look for a broken or loose hose or pipe that might have came off.Specially if you ran over something.If none found it could just be the vent solenoid stuck in the venting position.Good luck.

Nov 30, 2009 | 2006 Chevrolet Silverado 1500 2WD

2 Answers

2003 chevy silverado 1500 check engine light on .leak in evaporator system code,how can i determine which part


2003 chevy silverado
A picture of a engine is on the dashbroad, what can I do to get it off.
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Oct 01, 2009 | 2003 Chevrolet Silverado 1500

1 Answer

We hooked up an OBD11 Auto Scanner to our 2005 Chevy Silverado 1500 pickup and got the codes P0449 and P0455 What do they mean and can we fix it ourselves or do we have to take it in.


P0449 has to do with the Evap System. The problem could be with wiring short circuit, Could be the EVAP canister purge valve or the ECM.
P0455 has to do with the evap system as well. Could be a leak in one of the hoses to the evap system so you need to check all lines to the evap system. There is also one hose that connects to the top of the tank that we have seen come loose. Could also be a intake leak or a problem with the Canister purge valve. You can fix these yourself somewhat. I would trace down all the lines first to see if anything has come loose under the vehicle to the Black plastic EVAP canisters. Without being able to check the valves you will probably have to take it to a shop to have them checked out or pay the price to replace the valves and gamble they are the problem.

Sep 29, 2009 | 2005 Chevrolet Silverado 1500 2WD

1 Answer

Have a p449 code on my 2003 silverado


P0449 and P0455 has to do with the Evap Canister control solenoid which causes a large vacuum leak. I think the replacement part number is 19207763. The part is located back by the fuel tank, mounted to its side.

Aug 29, 2009 | 2003 Chevrolet Silverado 1500

2 Answers

Check engine light is on p0455 is the code whatis it


P0455 EVAP EMISSIONS SYSTEM GROSS LEAK DETECTED.CK GAS CAP.IF IT IS TIGHT U WILL NEED A SMOKE MACHINE TO CK THE SYSTEM FOR LEAKS

May 04, 2009 | 2003 Chevrolet Silverado 1500

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