The majority of the codes when I've done a search appear to come back as communication errors between modules or possible CAN errors.
One link I've found seems to point to possible issues with connectors on the wiring loom
(
https://www.volvoforums.org.uk/showthread.php?t=266079 )
so may be something to look at?
First thing would be to clear the codes if none are showing as active then recheck if a fault occurs or just periodically to see what returns.
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Current cars: 2003 V70 D5 SE (MY2004); 2012 CRV 2.0i V-TEC;
Gone but not forgotten: 2001 Honda HRV; 1989 VW Polo C Mk2; 2000 Honda Civic VTi Aerodeck
; Cavalier SRi; Cavalier LX; 1971 Triumph Spitfire Mk3; 1963 Triumph Herald.