A friend of mine has a 2005 chevy blazer that had the check engine light on. i own an obd11 code reader, and the code p0455 was displayed. my manual describes this code as an evaporative emissions system gross leak. where do i start looking?
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P0449 has to do with the Evap System. The problem could be with wiring short circuit, Could be the EVAP canister purge valve or the ECM. P0455 has to do with the evap system as well. Could be a leak in one of the hoses to the evap system so you need to check all lines to the evap system. There is also one hose that connects to the top of the tank that we have seen come loose. Could also be a intake leak or a problem with the Canister purge valve. You can fix these yourself somewhat. I would trace down all the lines first to see if anything has come loose under the vehicle to the Black plastic EVAP canisters. Without being able to check the valves you will probably have to take it to a shop to have them checked out or pay the price to replace the valves and gamble they are the problem.
I had the same code on my 2005 Tahoe. I kept getting the tighten fuel cap warning and code P0455. I just replaced the Fuel Tank Evaporator Control, GM part # 25932571. List price is $28.27. On the Tahoe it is located on the passenger side in front of the rear axle next to where the exhaust goes up and over the axel. With a lift it took about 20 minutes to replace it. I don't know if the location is the same on the Silverado. GM parts direct has the part for $14 and change with another $12 and change for shipping.....it's easier to go to the dealer and pick it up.
There are a couple of bulletins from GM on valves causing these codes. # 05-06-01-030D and #PIP3063C are the bulletin #'s you need to have them look at. They are related to the valves in the cylinder head causing your exact symptoms. You should contact another dealer or GM customer assistance with this info. Good Luck
Your car has a OBD2 hook up under the dash somewhere on the drivers side, You have to have a computer to hook up to that ODB plug and reset it, If you live near a Autozone they will clear the code for you for free, One other thing you try is disconnecting your battery for about 30 mins, that works on alot cars to reset the check light.