Codes, codes, and more codes

[bigjoe01]

Hey, newbie here, in have an issue with my 01 Z71, 5.3 Tahoe, the service engine soon light is on, the codes are P0405, P0446, and P0405 again (autozone), which is a bad egr valve, but I replaced the egr like 6 months ago, the ses light never went away, any suggestions on what this problem can be? Btw, the truck runs fine, gas mileage is normal, and I have no other issues, well other than rust....

 

[pudgyhd]

Look at the evap module. The line to the canister by the gas tank get plugged in really dirty conditions and will trip codes. Mine did as well so i will be replacing mine on a nice day.

 

[5time]

How do I find the codes

The check engine light came on in my 2005 tahoe. It seems to be running fine and oil is ok. All guages look good. Gas cap is on and door is shut. Where can I see the associated codes? Does it take a special device?

Thanks for any help.

 

[pudgyhd]

Autozone can help with that. Could be evap sensor code 446 is plugged. Mine is on for same reason and my 01 tahoe is running fine also. Changing this weekend to see if it helps. I am sure other more skilled may chime in, but just my situation.