[spacedout]

I don't have an LTZ but would think any settings would be buried in the radio like all the other car settings. If your not finding any settings out of whack I would probably take to the dealer since it appears to be malfunctioning.

 

[spacedout]

If I'm reading your car description correctly, you have a 2LT. And I'm pretty sure the keyless/passive entry system only comes with the LTZ. I could be wrong though. Anyways, all the settings your fob can do can be found in the CONFIG menu on your radio. And checking in your manual would be a good idea.

Its was optional on the 2LT in 2012 when I bought my car, think it was called remote access. Looking on chevys website now it looks like a $300 option 'Keyless Access with push-button start'. However Gm does not include this with the diesel for some reason, I think it should be standard.