Have you inspected the ecm connection? The pins are thin and prone to bending and not seating correctly.

 

I have not, truck is over ten years old and never moved anything there. But that doesnt mean it could have moved over time. Worth a check as well

 

Engine grounds can cause this issuse also.

 

Reviving this thread because issue is happening more often to where I cant even drive the truck. I tried to change the DTC to not alert and that did not band aid the issue. I called my local tuner and asked about if I got a new ECM if we would need to involve the dealership. He said yes if you get a brand new one but if you can find a used one you simply remove the vats, update vin, and anything else you changed on previous tune. With that being said I found the below vendor that can do all of it on a tested/proven ecm PnP basically. I am skeptical of buying one off ebay with no checks done on it. Anyone have any previous work with them?

https://www.fs1inc.com/2011-chevrole...plug-play.html

 

Never heard of them personally

Not to side track but I wonder what the alldata method of diagnosing this code is?

 

I have never heard of the alldata method

 

Alldata is the web service you can purchase that helps diagnose some codes and has good information. There is another website I can't remember the name that does the same thing and shows other mechanic fixes

 

Update on this one, I bought a ECM from flashmasters the junkyards didnt have one. The plus side is they had them cheap, tested for functionality, and they have flashed ready for plug and play. Once I got it in and drove to make sure no DTC's came up. I licensed it with HPtuners and put my old tune changes back in like DoD disable.