Notes On Intermittents
WARNING: This page is about a different car, the 1988 Cadillac Seville and 1988 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
If code EO60 is stored as an intermittent code, check operation of park/neutral switch input test. After selecting input EI74, manipulate affected wiring while observing switch status. If switch changes status while wiring is being manipulated, repair faulty wiring or connections. If no trouble is found, it's possible that code can be set by inadvertently placing transmission into neutral while cruise control is engaged.