FAQs Brief Specs Question What should I do if a communication error occurs? Product Overview Answer Please follow these steps to troubleshoot the issue: 1) Check if the ignition is ON. Features 2) Check if the UltraDiag VCI is securely plugged into the vehicle’s DLC port. 3) Turn the ignition off. Then, turn the ignition on again after 10 seconds and continue the operation. 4) Check if the vehicle’s control module is defective. What's In The Box? Comp Chart FAQs