I have had the problem of the P0440 code for about the last month on a
2000 GMC Jimmy. Tried the gas cap and a new air filter to no avail
and the code would come back, once reset, after about 200 miles of
driving. It needed an air filter, which I am embarrassed about,
because there is no excuse for that.
So I went outside and put the -just stand there and look at the engine
treatment on it-. I found this solenoid thing on the passenger side,
mid to back of the engine with what looked like it needed a connector
on it. I am not sure what this part does but I found the wires
tucked down into the wiring harness. I snapped it back on the
solenoid, and reset the computer. I will let you all know if this
fixes the problem. I can take a picture of it and show you guys the
part I am talking about.
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