This looks like it may be under warranty yet so I would just take it to a dealer that knows what they are doing.

I would have to guess a bad wire crimp, bad map a leak. It is just one of those things where you have to get in there and start checking things out.

Mine had a temp issue that set no codes and found it was just the Map hitting the AC compressor due to a replaced intake tube due to an accident.

When I say a dealer that knows what they are doing I mean one that has a in house tech that is trained in the Eco and Duramax engines. There is nothing wrong with the crimps if they are done correctly with the correct Kent Moore tool. I find many are not done properly while others are and have no issues.

 

Bump This is good info, but I need more. I believe it's a short in the wiring, probably in the crimped area for several reasons. It comes and goes, especially when I hit bumps in the road. It will surge. Plus I do have the GMTU and the guy who owned it before me upgraded my intercooler to a HAHN. The Chevy dealership around me in a 50 mile radius DO NOT know crap about HHR SS or turbo systems. When I had my valve purge cylinder
replace, the Master Tech told me my SS was the 2nd one in his shop ever worked on. These cars have been out for what, 5-6 years? I simply don't trust anyone around here where I live. And I can fix anything if I just could get a little more guidance and direction. Can anyone help me with that?