2011 Ford Focus P0605 Fault: Causes, Symptoms, and Warranty Coverage for Low-Mileage Drivers

I own a 2011 Ford Focus with 34,000 miles, driven primarily on short daily trips. Over the past two weekends, I've taken weekend drives of about 100 miles each, and both times the check engine light activated with fault code P0605. The vehicle runs normally under normal conditions, but this recurring issue is concerning. Given that my car is five years old, I'm wondering whether this problem would still be covered under warranty—especially since I've had difficulty getting honest answers from dealerships. Any technical insights or advice on what P0605 typically means and how to address it would be greatly appreciated.