Check engine light code problem

My 2005 chevy aveo is still giveing me a POA11 obd2 code and said DC/DC converter enable circuit/open this is a code for a hybrid but mine is gas and sometimes the hold light will start flashing and it acts like its stuck in 2nd or 3rd gear but if i pull over hook up code reader and clear codes hold light goes off and shifts fine and will not do again for maybe a month but check engine light comes back on in couple min with same POA11 code dose anyone have any ideas ive tried different code readers and all give same code thanks for any help