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Doesn't exist on these cars. There is no active monitoring/sensors at any of the diffs or any failsafes, your warning of no gear oil is the diff seizing
I dont think there was any sesnors on my 05 cts either. When I rant codes nothing said anything out of the ordinary for either one. 🙃 it's worth a shot though for them toncheck their diff.
Maybe....gold bits are never good. You may be losing pressure in a servo when hot or an apply piston that is in its last leg. What trans do you have so I can check the drum/brake strategy for 1st and 3rd?
A140E.
Additional data point, in colder weather the transmission has zero issues. Also, the unit has at least 400,000 miles I'm shocked it works at all given the level of debris I found. Yesterday I had a flashing O/D light for the first time which was potentially great I could pull any codes see what's up. Sadly none are stored.