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Volvo odometer/mileage is stored in multiple ECUs: the instrument cluster(Drivers information module, DIM),
PSCM (Power Steering Control Module), ABS, TCM(Transmission Control Module)or VDDM(Vehicle Dynamic Domain Host)。
Furthermore, volvo also broadcasts odometer in its CAN messages,
e.g. CAN ID 0x285 every 200ms, byte [2 3 4 ], converted them into km
0x405 every 1000ms byte【5 6 7 】
nice share, thanks!. and one of the other fun facts is on the 93-95 850s (and possibly the 900s) with the push button LED code reader, you can also pull the odometer reading (just google or check YouTube.