2005 Gmc Sierra 1500 V6 Obd Codes

[venison]

My 2005 GMC Sierra V6 1500 first generated code PO128 a year ago. The truck runs fine and the temperature seems right on the gauge. This week the truck has 2 additional codes PO455 and PO449.

Could there be a common failure that creates the 2 new codes? What are we talking in expense to have the work done at a garage or dealer?

 

Thanks.

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Those two codes are basicly saying that you have a leak somewhere in your evap system. I don't think it's related to the temp sensor. It throws the other code because when it leaks it thinks the solenoid is not working correctly. Here's another topic on it: topic