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The airbag is probably due for a replacement, or there is a fault with it. Suggest you get this done by Volvo. And if you ever need to work near the seats, the side airbags are passive (does not help to disconnect battery) and there is a plastic interlock key that you need to insert. Remove a cover on the seat, then the key is right there.
It is unlikely the transmission electronic module is faulty, more likely a sensor or wiring. If you take the car to Volvo for the airbag, get them to check out the transmission as well.
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