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You most likely have a fault on the regen system with a stored code and that is why the regen isn't able to be done. Disconnecting the battery doesn't do anything other than cause more codes because the ECM sees a power loss.
At this time, the onlyo ption is to pull the codes, reset them, and have a manual regen done with the computer. When the manual regen is done, it will code out as to the error and then that error will need to be repaired in order for the regen to complete.
Volvo engines just will not allow regens any other way when they error out.
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