How to fix the CAT ET SIS error

This means you have communication error between your CAT II / III adapter and the CAT ET SiS software setup. Usually it is a simple fix.

– In the CAT software go to UTILITIES   =>   PREFERENCES   =>  COMMUNICATIONS
– CHOOSE: CATERPILLAR COM ADAPTER II
– CHOOSE under PORTS: COM 7
– Click “OK”
– Restart the computer and usually that is all you need to do.

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But if the above steps do not work, then your adapter is setup on a different COM PORT. In which case watch the video below on how to find which com port your CAT II / III  adapter is using and match it with the Cat ET SIS software to fix the CAT #142 error message.