I am guessing you fitted a non-original alternator
These cars use intelligent alternators that talk to the CEM
If a plain old dumb alternator was fitted, it may charge the battery, but it won't talk to the CEM, and thus the CEM says something is wrong.
CEM won't need recoding for an oriignal Volvo alternator
Solution: fit an original Volvo intelligent alternator
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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