Volvo Owners Club Forum - Mileage adjustment

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- XC90 '02–'15 General (https://www.volvoforums.org.uk/forumdisplay.php?f=37)

- - Mileage adjustment (https://www.volvoforums.org.uk/showthread.php?t=284357)

Quote:

Originally Posted by Tannaton (Post 2429270)

The Russians have.

I've read some discussions on Russian forums about altering the CEM flash memory.

BUT it requires very special tools, not readily available, and knowledge of how to calculate and generate the required PIN code needed to alter the CEM memory. And even the Russians keep that a very good secret.

In other words, there's a lot of security built in to the CEM that will stop all but the most determined hackers from messing with it's memory contents

Quote:

Originally Posted by Tannaton (Post 2429270)

I agree that it's possible to alter the mileage on the dashboard using simple memory chip programming tools, but altering the mileage stored in the CEM is another matter and I don't think anyone's done that.

With regard to "clocking", in the new age of electronic service and MOT records, unless you are winding back a sub-3 year old car small amounts on a regular basis - I don't see the point because it's so easy to check now.

It's straightforward altering the memory in the ECU, its just a specialist job.
Equipment is readily available, what isn't readily available is the knowledge on how to do it! Hence the expert needed.