1.9 Multijet won't rev over 3k rpm code PO481

[tayto.king]

My 2006 fiat doblo 1.9 multijet will not rev over 3,000 rpm and is showing code PO481- POWERTRAIN cooling fan 2 Control unit.

 

[tayto.king]

I've changed the maf, map, fuel filter and air filter. There are no air leaks either.