I am submitting this report to formally document a severe safety-related failure involving my 2013 Volvo S60, VIN # [XXX] . This vehicle is part of the Volvo brand, widely recognized and marketed as among the safest in the world. Incident Summary: On [XXX], at approximately [XXX] in Norwalk, Connecticut, the vehicle experienced a catastrophic mechanical failure while in operation. The auxiliary (serpentine) belt suddenly failed, shredded itself, and wrapped around the timing pulley. Debris from the failed belt entered the timing belt housing a” a supposedly sealed and protected compartment a” causing the timing belt to jump. This resulted in an immediate loss of engine power while driving, placing me in a highly vulnerable position. Fortunately, I was not on a multi-lane highway or in fast-moving traffic. Had I been traveling on a busier route, the sudden loss of power could have led to a serious crash and potential injury. This failure represented a genuine threat to my safety. Further inspection revealed that: The lower crankshaft sprocket had skipped three teeth due to the intrusion of the auxiliary belt. The timing belt, although not broken, was off track. A new timing belt was installed in an attempt to restart the engine. The engine would crank but failed to start. A compression test revealed zero compression in all cylinders. The valve train was severely damaged (bent valves), and the engine sustained internal mechanical failure beyond repair. Conclusion and Context: This is not an isolated incident. Upon further research, I discovered that this failure a” specifically the auxiliary belt disintegrating and compromising the timing belt system a” is a known and well-documented problem in vehicles equipped with the B5254T12 Turbo engine. Volvo has been previously alerted to similar cases before. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)