P0528 = Fan Speed Sensor Circuit No Signal. Check the electrical connector going to the fan clutch and also check the wiring to make sure nothing is broken or nicked.
Probably needs a fan clutch, or the wiring has been mangled up where it clips into the fan stator.
Year/Model of truck would be appreciated, too - makes it a little easier to offer input sometimes.
I don't show your U code in my manual - however U codes are set during module to module network communications, it may be nothing to worry about at this point in time.
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