Thanks, Barry, for the feedback and advice. This has been an issue for a long time, since maybe 10k miles or earlier (I'd have to check the documents), involving several sessions of recharging the catalytic converter and having parts replaced in the exhaust, such as sensors, etc. I have certainly already decided I will be contacting corporate. I have plenty of documentation to defend my case.Did you have problems with the CEL coming on prior to passing 60,000 miles? Is this a long-term issue for you?
If so, you might petition GM to give you a "good will" warranty replacement. Show them all the redesigned EGR coolers that are going out to diesel Cruze owners because of these problems and show them that your problems started before your warranty ran out. If this is a redesigned part, you might ask them pretty please with sugar on top to replace it for you.
The other option for a continuing problem would be small claims court. If they refuse to replace a known bad part that they're replacing on other cars, it would make a decent case for you to take to small claims court. Having done this with Hyundai for a different issue, they just settled with me instead of going to trial.
What I find interesting, though, is that yours is covered under a powertrain warranty and the dealership that I took my car to told me that it was not covered under powertrain warranty. They also told me my car is still under the powertrain warranty (maybe it was extended due to these known issues).