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Evap code on 2003 gmc sierra - 2003 GMC Sierra

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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.)

Posted on Oct 08, 2009


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Always Google any codes you get & read up

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If the Evap Vent Valve or it's control circuit are bad, then
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2002 gmc sierra p0171 p0174 p0300 oygen sensor and misfire codes

Check for vacuum leaks to start. Then check the evap system. I just replaced a evap vent solenoid on a suburban with the same codes. fixed the problem.

Apr 17, 2011 | 2002 GMC Sierra 1500

1 Answer

2003 GMC Sierra Has recently developed rough idle/lope at idle which sometimes goes away. Runs fine otherwise. Scan codes-Lean condition bank1 and bank2. Random misfires on all cylinders. Fuel pressure...

You never replace anything, on a Wishing,Hoping,Pushing,Poking,diagnostic approach

You learn the vehicles Systems,Test,then Replace,if you have a failed component.

Work on the Misfire Issues.
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Not a the plugs.

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1 Answer

Po446 code on a 2000 gmc 50000 miles

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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

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