There is no power in the Phoenix MDCI Pro dongle after connecting to the vehicle's DLC port. Q A Possible reasons ： Poor contact of vehicle's DLC port; Too low voltage of the vehicle battery; Damage of the Phoenix MDCI Pro dongle. Solution ： Plug out the Phoenix MDCI Pro dongle, and then plug it in again; .Recharge the vehicle battery; .Replace the vehicle battery if it is damaged; Contact TOPDON after-sales service to get support. 33