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Code P455

CardGuy

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CardGuy Enthusiast

CardGuy

Posted
Posted

03 silverado 5.3L 69,000 miles.

 

Check engine light is on. Had code read at the local shop and showed Code P455 (Evaporative System Gross Leak).

 

Does anyone know what or where I should be checking for a leak?

Haulin' 8.1 Enthusiast

Haulin' 8.1

Posted
Posted
03 silverado 5.3L 69,000 miles.

 

Check engine light is on. Had code read at the local shop and showed Code P455 (Evaporative System Gross Leak).

 

Does anyone know what or where I should be checking for a leak?

 

 

 

 

Don't take this as a smart remark, first thing is to make sure your gas cap is in place and fully tightened. That's by far the most common source of a sudden gross leak. Yes there are codes for small leaks. The shop you went to should have checked that for you and reset the light. Other causes of gross leaks are loose or damaged EVAP plumbing or components. These hoses and pipes connect the fuel tank vapors to charcoal collection canisters then to a valve that regulates their injection into the intake manifold for burning. They usually run with the fuel lines but are larger. Check for a hose damaged underneath, especially if you've been over rugged terrain or ran over something. Check underhood for a loose are torn rubber hose in the system.

 

Vernon

CardGuy Enthusiast

CardGuy

Posted
  • Author
Posted
03 silverado 5.3L 69,000 miles.

 

Check engine light is on. Had code read at the local shop and showed Code P455 (Evaporative System Gross Leak).

 

Does anyone know what or where I should be checking for a leak?

 

 

 

 

Don't take this as a smart remark, first thing is to make sure your gas cap is in place and fully tightened. That's by far the most common source of a sudden gross leak. Yes there are codes for small leaks. The shop you went to should have checked that for you and reset the light. Other causes of gross leaks are loose or damaged EVAP plumbing or components. These hoses and pipes connect the fuel tank vapors to charcoal collection canisters then to a valve that regulates their injection into the intake manifold for burning. They usually run with the fuel lines but are larger. Check for a hose damaged underneath, especially if you've been over rugged terrain or ran over something. Check underhood for a loose are torn rubber hose in the system.

 

Vernon

 

 

 

 

 

Thanks Vernon. I have checked the gas cap and always make sure it clicks. So far I have not been able to visually spot anything that looks out of wack. This check engine light has come on twice before but went off the next day. It happend maybe a month ago, then a week ago, and now the light has been on steady. I'm going to poke around under the hood again tonight and see if I can spot anything. Hopefully this won't ruin my 4th of july :fume: run to the lake with my boat. The truck seems to be running just fine. Maybe I can get it into the dealer soon. I doubt it though, they are usually backed up pretty good. :cheers:

Guest 007FL

Guest 007FL

Posted
Posted

I wouldn't worry about your trip to the lake. I believe SES codes are only about emissions. As long as you can't smell fuel I wouldn't be too concerned. Don't get me wrong. Get it fixed, but don't let it ruin your weekend.

 

:fume:

BlueTahoe Enthusiast

BlueTahoe

Posted
Posted

I tripped the same code a few months ago. I pulled of the gas cap wiped off the seal with a paper towel. Then cleared the code and off I went. No code since then. I do give the gas cap a couple extra clicks for good measure now. Mechanic told me basically the same as above here. Check all vent hoses running back from the charcoal canister for leaks. Mechanic also said it could be the gas cap itself. I havn't got the code back so I'm assuming it was just a bad seal at the gas cap. I know the cap was tight but it must have had some dirt or something preventing a good seal.

CardGuy Enthusiast

CardGuy

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  • Author
Posted

Well, I was poking around under the hood last night and so far I can't seem to find any leaks, cracks, or loose fittings. I've looked over every hose I can see coming into/out of the intake area of the motor. One thing I couldn't find is the charcole canister itself? On previous vehicles I've found it easy. Does anyone know where this thing is or what shape it is? I really need to get a manual but the stores I've looked at never have it for an 03. Time to order online I guess. Next step may be to clean up the gas cap and reset the code. I did check the rubber gasket on the gas cap and it seems ok. Keep the suggestions coming! Oh, and don't worry, I'm no tree hugger! To the lake CEL or not!

Haulin' 8.1 Enthusiast

Haulin' 8.1

Posted
Posted

Nowadays the charcoal canisters and control valves are mounted very close to the fuel tank. Also on the GM truck it will be above the tank just forward of it. I don't know about your area but here we are under emissions control inspections. any inspection shop can check a gas cap, if not a dealer should be able to.

 

Vernon

  • 3 weeks later...
sjspor Enthusiast

sjspor

Posted
Posted

On my truck, the purge valve had a rock in it, so it would'nt seal. Thats the valve almost mounted between the bed and cab, that is attached to canister.

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