Code PO455


#1


Evaporative emission control system leak detected (gross leak) can someone give me some advice as to where to start looking? 2007 Avalanche










#2

Gas Cap On Tight?

Make sure it’s clean around the neck and the cap. Caps are relatively cheap.

Out of warranty, already?

CSA


#3

Try a smoke test. It’s a test where smoke is pumped into the vacant areas of the fuel system and blows out the leak.


#4

You could possibly have some chance for warranty here as these systems must work for 2 years regardless of mileage. Why are you out of warranty?