I have a 2015 1500 with the 5.3 and around 29,000 miles. Last week I was driving to work going about 60mph on a gradual uphill and the check engine light started flashing. I slowed down and pulled over. As I slowed down the light stopped, I then shut the truck off, then restarted and went on my way. Hasnt done it since, however it did do it about 2 years ago about the same situation. No loss of power or evidence of something going wrong. Checked for any codes and there was none. Any ideas what may cause this, and should I be concerned.