If the WebSphere Admin Console application has been accidently removed, You can redeploy the same using wsadmin script deployConsole.py
a. Check if the isclite application is presnt in <WAS_HOME>/systemApps/ folder, If the file is not there you can try copying isclite.ear from a working system (of same version) to systemApps directory
b. The script deployConsole.py is located in the profile_home\bin directory.
To install the admin console module -
wsadmin.sh|bat -host hostname -port portnumber -lang jython -f deployconsole.py install
( To uninstall : wsadmin.sh|bat -host hostname -port portnumber -lang jython -f deployconsole.py remove)
Restart Deployment Manager