my evap code keep coming on on 2004 GMC Yukon XL Denali

my evap code keeps coming on and the local auto parts guy tells me it should go off in a few days. the first time it came on i went to repair shop the removed code i would like to know how to solve and prevent problem from happening again thank you for any help.

by in Chadbourn, NC on December 26, 2009
2 answers 1 comment
ANSWER by on December 26, 2009
You need to have the EVAP code retrieved. Just clearing it is useless. In California, where I work, they DON'T allow you to just clear a code, because it is bogus and a scam, it fixes absolutely nothing. Once you know what the EXACT CODE number is, let me know, I do Emissions work for a living and I deal with theses issues every day. I will try to help you deal with this.
COMMENT by on June 16, 2010
I have the same problem with my Denali. my engine light came on. I took to auto zone and they gave me the code.. P0455 evap large leak detected. acouple week ago my service ride control light came on the dealer told me it was my air ride compresser. so I put the new on myself and i noticed it was a hose that look like it was coming from the area where you put the gas at running down to the pump. I hooked up everything right and my service ride control light went off..a week later my engine light you know if my evap problem got anything to do with the hose going to the compresser.
ANSWER by on February 17, 2010
Hi - just tried to smog my 2002 Jeep grand cherokee - failed for functional check - got "P0455 evaporation control system gross leak detected". HELPPPPP!!!

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