pTr73

I was taking the car to work the other day and fueled it up. when I was coming home from work I started the car and the CEL light came on. I had this problem in the past, after the headers and CAI intake installation so I am figuring it's related to that again. I get home and I plugged the reader up to it and it read P0499 EVAP emissions control. I am thinking maybe a fuse blew and i checked them and they all seem fine. I have seen the thread about this issue but I want to know of anyone else has had this problem. my far is an 08 z51 6spd. does anyone know the part number for that valve?

TnRZ06

May not be it but check your gas cap.

pTr73

Thanks, I checked the cap and even fueled it up again, the light is still on. I never topped the car off so I can safely rule out getting fuel in the canister. The car is 6 years old and considering the solenoid's location I wouldn't be surprised if it is bad now. I don't really use the car in rain but a few times got stuck in it (never a puddle). I will change the part since I ordered one and if it still stays on I will investigate a short circuit (I hope it isn't).

pTr73

Ironically, this morning I was on my way to work and the DIC displayed "check gas cap". I pulled over and opened the fuel door and removed the cap and then screwed it back on. I turned the car off and on again and the message went away.... The CEL light was off at the time and I drove it around for quite some time yesterday.... I also suspect it may be the gas cap now since the light comes on after I went over the verrazzano bridge (its roadway peak height is about 230 feet above sea level). I am wondering if the cap seal is weak, would the rapid change in altitude alter the pressure hence triggering the CEL light to come on. I know it seems far fetched but its just a thought.... I ordered a fuel cap now for $15 and I will change that first and see if it fixes the issue.