Question about 2003 Chevrolet Silverado 1500
P0455 Evaporative Emission System Leak Detected (large leak)
The large leak detected could be in a hose or connector leading to the front under the hood evaporative canister.
It is not a loose gas cap, though.
Posted on Oct 08, 2010
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Posted on Jan 02, 2017
These codes are for the evaporative emission system.The 455 is the vent solenoid.The 455 is a large leak in the evap.system.The vent solenoid I would replace because they go bad and will not work because they are under the vehicle in the rear of the truck.There is a bulletin for these and the vent valve is installed in another spot.The number for the bulletin is 02-06-04-037E.You should also look for a broken or loose hose or pipe that might have came off.Specially if you ran over something.If none found it could just be the vent solenoid stuck in the venting position.Good luck.
Posted on Dec 01, 2009
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