[jblackburn]

Usually wastegate pivot pin wear and the turbo will no longer build enough boost to satisfy the car. Wait for the CEL to come back and take it in; it is covered by powertrain.

 

[jblackburn]

wouldn't the light stay on until the code is cleared...? Or I like when you have a misfire it flickers when computer senses misfire..

No. Certain conditions are calling for more boost than it can deliver. Just like it takes multiple instances to set a check engine light, after multiple cycles of NOT seeing a condition reoccur, the car will turn the CEL back off and delete the code.

 

[jblackburn]

Would using some type of high temp grease on the pin such as break caliper grease prevent this?

Might prolong its life a bit. It seems like the Cruzes ECM is very busy battling knock and trying to advance timing most of the time, and it flutters that wastegate a lot under acceleration.