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Jan Andersson
Jan Andersson, ASE Master Tech
Category: Chevy
Satisfied Customers: 834
Experience:  20 years of general automotive repair & modification. Chevy owner.
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I keep getting a P0455 code on my 2006 chevy colorado. does

Resolved Question:

I keep getting a P0455 code on my 2006 chevy colorado. does replacing the fuel cap fix this?
Submitted: 6 years ago.
Category: Chevy
Expert:  Jan Andersson replied 6 years ago.

that code indicates a "large leak" in the evaporative emissions system. The most common cause is a bad or poorly seated gas cap. But in all honesty, it can be something else too, like a broken or disconnected hose on the emissions evaporation canister or in the hoses leading to it somewhere.

There is also a purge valve on the evap canister that can go bad and cause this code. Trace all hoses that connect to the evap canister and look for a bad connection.


Is there rust or other buildup on the gas cap? Does the seal look ok?

Your vehicle is too new to have serious rust issues, but sometimes the tank breather (vent) pipe can rust through and cause this.

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