My 2003 Durango is showing a PO440 engine code. Can anyone tell me what it means and if I'm going to have to take it to the dealer. The vehicle is running fine. I don't want the dealer to rip me a new one. Help!

 

First thing to do is go buy a new gas cap. There is an index of engine codes at the top of this section heres a link. https://dodgeforum.com/m_614377/tm.htm

If the gas cap doesn't work tighten up all of your connections on the fuel lines.

 

welcome to DF...

Mean... is the 440 code for the small evaporative leak? I thought it was 442...[&:]

 

Should I get a replacement gas cap from somewhere like Advance Auto Parts or do I need to get one from a dealership?

Thaqnks for your help.

 

Ater replacing the gas cap will I need to diconnect the battery to reset the computer and turn off the check engine light??

Thanks

 

You're right Steve it wouldn't be the gas cap unless there is a huge crack in it or something [&:].Sorry for that advice. I would look at the fuel lines and I think the most common area to get the leak is in the filler neck going into the tank. Make sure it is all seal up well.

 

After checking the the gas filler hose, how do I reset the computer??

Thanks

 

You can disconnect the battery for 15 minutes which will reset the whole system, or you can pull the fuse to your ecm which will keep your clock/radio settings and reset your check engine code only.

 

where is the fuse for the ecm.

 

Thatis incorrect. I took my D to the dealer under warranty 5 times. They always said it was a fuel or vacume line we found it its fixed. Two days later the check engine light was back on. I told them to replace the gas cap because I had the same problem with my old dakota and it was the cap. Finally ater getting tired of them I replaced it myself and reset the light. It never came back on. Save yourself the hassle buy a $12.00 cap...