Hi Jeff,
Dodge truck? I don't have the chart for their numbers, they may
like other Chrysler products such as the Cruiser:
http://www.ptcruizer.com/computer-codes.html of which 442, 455, and 457
are similar numbers to the Grand Cherokee we were talking about, of
which a loose cap may have thrown P0442, P0455 P0456, P0457, and/or
P0624: http://www.wjjeeps.com/faultcodes.htm
God Bless America, ßill O|||||||O
http://www.billhughes.com/

Jeff Strickland wrote:
>
> Because in the past 6 weeks the Check light came on on my daughter's truck,
> and the code was P0440. There were other codes as well, but they all related
> to an open in the fuel system somewhere. She said that she found the gas cap
> not fitted properly, and this can contribute to the other codes we got. We
> got three codes in total, but I only remember the P0440 without looking at
> the choices.
>
> All I was pointing out was that the link you posted, just by chance, lists
> two P0439 codes, but the second of them should be P0440. P0440 simply means
> the Evaporative Control System is open. Check another ODB II Code List to
> confirm. And, the second digit is 0 (zero) not O (uppercase o).