Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
im cam, a licenced diagnostic tech.
i have seen this a few times on these and it has been because the fluid was low because of a seal leaking.
this will have to be scanned and read the trouble code stored.
it is a very sensitive differential unit and if it is low or it notices slipping than it will activate the service message and store a code.
I am thinking it is to do with fluid level as i have seen the axle seals leak on these a few times before.
other possibilities are the differential clutch control module and the differential unit itself.
i would make an appointment and have them scan it and check for leaks
let me know what you find!
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