I have received both of these letters too. The most recent(steering)yesterday.Just received this letter yesterday, framing it along with that other 150K mile/10year extended warranty with the water pump.
Both say, do not take your Cruze to your Chevy dealer unless you are having a problem.
With the water pump letter I thought it was a scam with a GM look alike letter. I guess not with the info I see here.
What do we do? Do we have to "sign up" with GM to cover any problems in the future?
I have a 2013 1LT cruze.