No not really without seeing it, check you have permanent 12v at camera, check you have 12v when selecting reverse, check the camera feed cables are in the correct plug/pins on the back of the headunit, check to coding has been done correctly
A couple of pointers, the camera will NOT work if the tailgate is open so must be closed when testing
If the coding has been done correctly you should see a different display on the radio screen even if there is no video signal being inputed
You have to use an upto date version of VCDS, older versions will not be able to communicate with the modules and will prob ask for an access code before accepting coding, a current version shouldn't need this
Some vehicles don't register coding changes immediately and the vehicle needs to be allowed to 'sleep' before the changes take effect