06MonteSS wrote:they're both GM Class-2 vehicles... same vehicle class, same communications protocols, etc...

So do you have any suggestions? My $100 Scan gaugeII monitors just about everything the Diablo does and doesn't kill the battery.

I maybe supid but how is a '99 Camero the same as a 2003 GMC 2500HD?

Still waiting

we're still checking it out.

I think that they forgot about us and moved on to modern car problems! Must be a lot of issues with these tuners. I have one that I can't use for what I paid for because it will drain the battery in 2 days. What a POS! You won't ever get any more of my money you ...

I too have a 2003 2500HD with the 6.0. I have the same problem and I also have a running post under the 2006 post above. So far no one has come up with any answers and it has been well over a month with mine. I even wasted my money buying a new battery for my truck. I can max the sleep mode to 60 ...

I've been waiting over a month. About how long does it usually take? Seems like there are a million GMC 6.0 out there. Also, I only drive my truck on the weekend. I would like something that will not drain the battery in a week. 3 or 4 days may work for people with only one daily driver but for me ...

I also have a 2003 GMC 2500HD with 6.0 and battery drainage. I have tried everything and called the company about it 5 weeks ago. I even tried changing the sleep mode to the full 1 minute and it will drain my brand new 1000cca battery in 3 days. I just unplugged it for the time being but hate that I ...