E-2 error code in Accu chek indicates that the code key is entered incorrect or the bar code information which was stored in the gluco-meter is lost.
Try these for fixing the issue:
1. Turn off the meter and insert a new code key. The black one which is inserted on the side.
2. Turn off the meter. Open and again close the test strip drum door.
If still the problem persists, you need to call the Customer Care Center and get help from them for fixing the issue. CCC number of Accu-chek is 1-800-858-8072.