I'm trying to read a tune out of an 04 LLY Duramax and for some reason it won't connect with the PCM! It keeps telling me to check the cables and turn the ignition off and try again, but it still does nothing. I've noticed in the little PCM selection box it says 98 PCM, 99+ PCM, and Duramax LBZ. There isn't a Duramax LLY selection, could this be the problem? Any help at all is appreciated, I've got to get this figured out ASAP!

 

check you lighter make sure it works...... if not cheack your lighter fuse... your pcm connection is powered by the same line

 

I've had to restart my labtop, Re-cycle the key, and unplug the MPVI interface will the labtop shuts down and restarts. Can you connect to the MPVI?

 

Just checked the lighter and it does not work, checking the fuse now.

 

Mine does that sometimes too. All I do is unplug the usb cable from the flashscan box and plug it right back in and reconnect. It works everytime.

 

if the lighter doesnt work, the obdii doesnt work.. Thought i fried my buddys obdii port, but the fuse blew because we had the power inverter (running laptop) plugged into cig lighter

 

Well turns out the problem was the fuse, how crazy is that? Thanks LesPaul, I owe you one man!

 

glad to hear it worked out for you.... wish someone told me.... i dicked with mine for hours....