hi,
i know your problem well, the tailgate lock had a faulty component inside it that prevented the handle from opening it sometimes. volvo made a new lock design to fix this,most were done under warrenty but its not a big job to fit anyway. HOWEVER getting the tailgate open in this situation is not easy and unless you are able to get the tailgate interior trim off in place then you might be better off to go and see your volvo dealer.
steve.
p.s. the keyfob batteries have nothing to do with this problem.
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