Did you ever determine the cause of this issue? I have a 2014 doing the same, already replaced throttle body and water pump.Did you find out what was wrong? I have the same p261f code. changed the change over valve and it didn't help I didn't see any sign of coolant in the old valve. it shifts strange like the engine isn't heating up and downshifts ruff. Today it gave me a turbo low boost code. Any ideas what I need to change or repair?