Question about 2003 GMC Sierra

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2003 gmc sierra: changed gas cap,solinoid at gas tank,relocated filter, and check engine light came back on with same code.code for evap emmissions.

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  • jgrohs404 Oct 08, 2009

    changed all parts including solinoid, tank is good, fuel vapor line is good,EVAP canister has no cracks in it

  • Ronnie Wilson May 11, 2010

    Have you checked the EVAP Canister 7 or Purge Solinoid, Fuel Vapor Line @ Tank ,?

  • Anonymous Mar 16, 2014

    how to replace fill engine light come on with code evap problems


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What is the trouble code you have please?

Posted on Oct 08, 2009

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My check engine light is on in my 2008 GMC SIERRA 1500 pickup with 5.3 V8 I have 2 fault codes, PO449 & PO455. I tried removing battery cable no help. Can anyone steer me in righ direction. Thanks

First check the tightness of your gas filler cap as this can cause the codes to set. To erase the codes you will need a scan tool or code reader . Check the wiring and connections for the EVAP vent solenoid . Fuel tank pressure sensor may be bad .

Dec 11, 2015 | GMC Cars & Trucks

1 Answer

Evap emmission,control sys leak

Do not top off your gas tank. The gas is going into carbon canister which is only for fuel vapors to go into (carbon canister opening near the top of fuel neck near the gas cap). Your flooding the fuel vapor canister with liquid fuel; of course you are going to get a sensor message... 'Evap emmission,control sys leak

P0443 The fuel vapor canister reduces that gas smell on hot days outside/inside of car. The fuel vapor canister fillers bad smells from gas tank on hot days when the gas expands and burps fumes through carbon canister filter. From the canister (gas vapor fumes) goes back into the engine to be burned's a closed loop for vapors to be recycled though engine. Don't worry, once the carbon canister dries out and no longer flooded with raw fuel the code should go away...just don't let the top off fuel tank back flow into the 'Evap emission control' carbon filter near the top and close to the gas cap...:)

Apr 20, 2014 | 2000 Ford Mustang

1 Answer

Check engine light

Evap ,,, bad gas cap,,,not venting,,,,,,,evap purge valve,,, under truck, has trash in it,,,,,,,,,evap solinoid,,, under hood stuck open,,,,all 3 pieces together are less than 100 bucks,,,,,,,, get the whole assenbly(purge valve) at pep boys,,, 31 bucks,, the othe 2 are 20 to30 each,,,get any where, also could be a a bad fuel presure sensor in the top of the gas tank,,, very rare not likly or the charcole canister ,,,never seen one bad,,,,if you have a odb2 scaner tool,scan down to the evap vp and evap purge,, at cold start the evap vp (h20)..,,,0.125...,and stay fairly steady, if it rises steady the solinoid under the hood is bad or stuck,,, .The evap purge should be 0.000 for about 90 seconds then open and be around 11-15% at idle,,,,

Feb 08, 2014 | 2003 GMC Sierra 1500

1 Answer

My service light is on in my truck. A friend of my hooked the mechine to it and stated EVAP problem. Just wonder if you had a idea what the problem is or maybe. I didnt want to put it a shop and spend...


A very common code thrower is the Gas Cap not sealing and leaking. This will generally throw an EVAP code of some sort. Try resealing your gas cap, and if that doesn't work, try replacing your gas cap. They fail pretty often, actually.

Other things that may throw an EVAP code would be your Fuel Evaporation tank has a leak, or you have a leak in your fuel systems breathing system. HOpefully it is just a Gas Cap thought. That is usually a $5-$10 fix. Good luck.


Oct 26, 2010 | 2003 GMC Sierra

2 Answers

2002 GMC Z-71 Check Engine Light codes????

Off hand, it's by your oil fill tube on top off motor.

Mar 30, 2010 | 1999 Chevrolet Silverado 1500

3 Answers

Engine light came on code is p0455 evap large leak....gas cap was loose this the problem

Here's a little more info on the situation

Mar 01, 2010 | 2006 GMC Sierra

1 Answer

Idiot light, but otherwise runs fine

first check ur gas cap if wasnt put on correctly ,left off ,or does not seal usually sets off one of the evap codes--if cap looks good than need to check vent valve possible faulty and the wiring circuit for damage or short -also check vent valve for blockage

Feb 10, 2010 | 2003 GMC Sierra 1500

1 Answer

Evap code on 2003 gmc sierra

Check to see that the gas cap is tight. If this doesn't fix it, you will need to get it scanned. (It takes some time for the light to go away after it's fixed.)

Oct 08, 2009 | 2003 GMC Sierra

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