sluggish acceleration at high speeds

[JJ2004XC90]

i have a 2004 volvo xc90 that was hesitating upon acceleration and climbing hills. i had volvo run a diagnosis on it and here is what the computer found. ecm-6110 engine cooling fan relay - signal missing
ecm6220 ECU-box cooling fan - signal too high
ecm6805 Turbocharger (TC) control system boost pressure fault - pressure too high.

any suggestions. the car runs fine it is just when i accelerate particularly at higher speeds it acts very sluggish.

Justin

[JJ2004XC90]

i know what caused this issue. i put 85 gas in a few fill ups ago. it definitely makes a difference using premium fuel. i have since used premium and the check engine light is gone and the car runs as normal.

[007]

Hi Justin, I am having the same problem in the same car, so the fuel was your cause?; I will try a better gas.

What about the 6110, 6220, and 6805 codes? are they gone?

Thanks.