The gas tank is locked with a DC lock motor item 6/37 on the schematic.
Lock motors move a link about an 1 inch, back and forth, to lock the doors and gas cap.
In the 850, and probably with your V70 there's a release link to manually free the gas cap cover, check the operators manual for this info.
You probably need to remove some trim inside by the gas cap to see what happened. The lock motor has only +12VDC and a ground, so you can check that there's power to the lock motor connector with a voltmeter.
The motor could be kaput, or needing adjustment. If the lock motor is working, there may be some adjustment to get it to latch and unlatch once you can see it. Maybe the linkage is binding/hung up.
Post back with some good news.
Bill
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