I did not find anything close to the problem that I am having in the other threads. This is a 2009 cobalt auto that shifts fine most of the time but some times I have hard shifts. I do not have any error codes for the transmission when I have hard shifts. I do not want to cherry pick parts to solve this problem. I have had this cobalt for a short time and it has 108K miles motor runs great accept has p0010 and p0013 codes. I have ordered the camshaft solenoids for the open circuit. Any ideas?