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code p0440

code p0440

Postby art800 [OP] » Dec 15 2012, 1:11am

2002 Chevy 1500 Silverado v6 4.3
I had the check engine light on today so I checked the code and it was p0440 evaporative emission system. Does anyone know what's the problem and what to replace to fix it.
And once again Thank you
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Re: code p0440

Postby ThetaTauManOB163 » Dec 20 2012, 4:43pm

I have the same code on my 99 5.3L

Probable Causes:
-Defective/loose fuel cap
-EVAP Canister or hose cracked - not connected
-Purge or vent solenoid defective
-Vacuum leak at engine

I bought a new fuel cap, but that didn't help. I'm going to dive into the issue over the Christmas holiday, I'll let you know what I find out and how to fix it if need be. I've been driving with the Service Engine light on for about a month and haven't noticed a drop in performance, so that is why I've slacked.

In my research, the wires leading into the Purge Solinode can get corrode leading to the issue.
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