I am new to the Duramax and love it so far. I was a Ford man for years but I have been wanting to upgrade. I traded in for a 2017 2500HD with the Duramax/Allison combo. I have driven it 5000 or so miles now. Just recently my check engine light stays on and the remote start does not work. My code reader says P133f and the printout says its rare for this model. Anybody else see this code and what does it mean?