From Wikipedia..
A checksum is a small-sized block of data derived from another block of digital data for the purpose of detecting errors that may have been introduced during its transmission or storage. By themselves, checksums are often used to verify data integrity but are not relied upon to verify data authenticity.
I have been informed that potentially, a non Vida dice code reader may also cause this (Cem-u030141 (software incompatibility)) code. I'm guessing it could be Volvo's way of detecting anything untoward being done to the installed software. But I'm not 100%.
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