My 03 Silverado 5.3L is throwing a P0449 Code. Which is the Evaporative Emissions Control system vent valve/solenoid circuit malfunction.

Would that code come up because I installed a K&N FIPK and it is causing problems with the system??

I don't want to take it to the dealer and have them look at it and say the K&N is causing the problem and we will not service it under the warranty.

Is there something simple I can do to check the problem or possibly fix the problem??

Need some good advice on what I should do at this point.

Thanks!

 

put the stock air box on and take it in. I dont see how a air cleaner will throw evap faults but what do I know

 

that has to do with the fuel evap system. First step is check to make sure your fuel cap is tight, then I'd take it to the dealer. The K&N won't affect it, and they shouldn't say anything.

 

Correct.

Have you done any other mods??

 

I have been searching the internet about it and I came across the same conclusion that it does not effect the EEC system.

I checked the gas cap and it was tight. I have been a little over a week since I filled up and I have about 1/4 tank left. So a loose gas cap may not be the problem. Might be the valve/solenoid circuit itself.

No, I have not done any other mods.

I do have a PCM coming from PCMforless which should arrive in the next day or two.

Should I have the dealer look at it before I install the PCM from PCMforless??

 

I would. If the for some reason re-flash your PCM you are screwed.

 

Thanks you all.... I will get it checked out tomorrow.