So I got an OBD II for my birthday last week! YaY! I finally got around to going out and plugging it into my truck, only to get NOTHING! Wont even turn on. I tried it in my dads F-150 and it worked fine. So therefore its my truck. Any ideas?

 

Check fuse #17. It is shared between the OBDII Data Link Connector and the lighter.

 

ditto

 

Thats exactly what I needed to do. Actually for some reason, I had no fuse in 17...idk.

Anyways. Pulled the code and it says

P0442- EVAP Emissions Control System Leak (small)

anyone have a diagram of the evap system???

 

Mine came up with the same code a few months ago, which is why I purchased the OBD scanner.
Turned out that my gas cap was loose, which causes the evap code.
Try re-tightening the gas cap and clear the code. If the code comes back, I'll find the evap diagnostics on my Factory Maint CD.

http://silvertank.batcave.net/obd.html

 

That makes sense George. Loss of pressure in the fuel tank/lines/etc.

If his Body lift was installed recently, that may be a cause also. Maybe tighten the clamps from the extensions you made to the fuel filler neck.