I don't know what to put in the subject line for this, but here's what happened (two different occassions already). 08 XC90 3.2L FWD, 14K miles:
First incident was on the driveway with very slight incline. Started the engine, put the gear in reverse so I can back up and leave. Four grown adults in the car. Car was not moving even with a slight tap on gas pedal. It's like there was a chock on the wheels preventing it from moving. Put the shifter back on Park, got out of the car and checked the underneath of the car to see what's preventing it to move. Nothing. Got in the car again, put it in Drive this time, the car moved a little, then put it in Reverse, and it moved after a "clunk" sound. Weird.
Second incident was the same, about 3 months later. But this time, it was in the garage, which is level, no grade. The car won't move in both Drive and Reverse. Had to play with it, by tapping the gas lightly until it moved or showed signs of gear engaging. Did the "clunk" sound again before it moved.
In both situations, it seems that the gears were engaged, but the drive axle won't turn even after I released the break pedal totally. I should also mention that in both instances, the parking breaks were disengaged and there was nothing underneath that was preventing the car from moving.
Is this something I should be concerned with?