The convertible top may have problems with the micro-switches and potentiometers that help control the raising and lowering of the top.
Several issues occur with the door locks on the Volvo C70 and most are because of the door lock assembly. What happens is that one door will not lock while the other one does. In other cases you will lock the doors and then one of the doors will immediately unlock.
The problem is that the door lock assembly is defective and will need replacement. Replacement of this assembly on the C70 is very difficult and is not recommended by a novice. Getting the door and window aligned properly so that you don't get air or water leaks is very, very difficult.
Knocking noises going over bumps can be caused by worn sway bar end links . These end links have small ball joints that become loose and rattle. Replacement is the only fix.
While driving the 2011-2013 Volvo C70, operators may notice harsh shifting or slippage of the transmission .
This is caused by software issues in many cases, however, internal transmission failure may be the culprit as well.
In some instances, the failure has been attributed to the ‘sealed-for-life’ nature of the transmission, as the transmission fluid may break down before the transmission is taken out of service.
The manufacturer of the transmission, which is a third party, has issued many software updates, but when these updates fail to correct concerns, the transmission must be removed, disassembled, inspected, and repaired.
Door window regulator failures have been reported. These vehicles have a very complex door window mechanism that can be very difficult to adjust properly after installing a new window regulator. This can lead to air leaks, wind noise, and a door that doesn't open or close properly. This is a good time to find an experienced Volvo mechanic !