2008 toyota prius, 151,000 miles. Get code P0AA6 but can't get any sub code (detailed code) after that. I've been to 2 dealerships and 3 mechanics. None of them can get it to show the sub code either. Can't get anything fixed til I find out the sub code. Symptoms: won't start.. Mechanics reset code but same thing repeats - won't start and it won't give the sub code so I can diagnose it. Help!!!