I learned something new. Yesterday the Wifey called me on her phone and said her '05 Cobalt had no power steering. The dash display showed "POWER STEERING". I told her to shut it off and I'll check it out later. Today I did and the engine started as always and the power steering worked. Huh? So I checked the FSM and it said that if the EPS computer doesn't see the voltage it wants, it shuts down. The electric PS uses a 60 amp fuse so I guess it is a power hungry component. I am thinking that since the car has mostly sat for three weeks with the schools closed, the battery ran down. The fact she sat in the car with the engine running yesterday may have given it just enough juice to satisfy the EPS computer. There were no codes stored, nor any pending. That was relief because almost every EPS code ends in "replace steering column". So I have the battery charging all day and I will see what happens.