Just a WAG but could it be something stuck in the electric parking brake? I guess to test you could put it in neutral on a flat area and see if you could push the car, I suppose you could also jack it up and see if all wheels easily spin?? Like Leftie I haven't read of anyone having a similar problem so I'm just grasping at straws.
Oh, any error lights on the dash?
2012 SL purchased used 2/'16
2013 S w/QC purchased new
Juicebox Premium 60a L1/L2 EVSE, Ebusbar 16a L1/L2 EVSE
'12 EVSEupgrade'd 20a L1/L2 EVSE, '13 EVSEupgrade'd adjustable 6-20a L2, 6-13a L1 EVSE
Zencar 13, 20, 30a L1/L2 portable EVSE
GE Durastation 30a