One problem related to timing tensioner has been reported for the 2013 Volvo S60. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2013 Volvo S60 based on all problems reported for the 2013 S60.
With less than 50,000 miles on it, my S60 just completely stopped working on my way to work. While pulling out of my development, the entire engine, power steering - everything shut down. I had to coast into a turning lane to put on my flashers. I had not gone more than 3 minutes from my house. After Volvo had it for a few days they told me that the alternator belt had jumped off, hitting the alternator, fraying the belt. This then resulted in the belt wrapping around another part of the engine impacting the drive belt. This resulted in damage to the drive belt, alternator, 1/3 of my engine and my cylinder block. Volvo is blaming this on a faulty belt tensioner, yet they are making me pay for part of the repair which is a total cost of $6,000. This is clearly a defective part - either it was installed incorrectly or it was not properly built as a belt does not just "jump". I was lucky that I had not yet gotten onto the highway or I would have been injured along with other people if not worse. This is a huge safety concern and Volvo does not seem to want to admit complete failure here. This car has been serviced regularly and at the same dealership.