Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
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This can be due to an internal electrical fault with a vehicle speed sensor sending an incorrect signal.I have seen this occur before with the speed sensor and had to replace it.Usually there are other issues as well if it is a speed sensor like the speedometer reading incorrectly or incorrect transmission shifting.If none of these issues occur here with this fault then this may not be the vehicle speed sensor needing replaced.
One other common component that will cause this is the cruise control module itself.I have seen this act up internally causing the speed to drop or operate the cruise like this here.This module is located under the hood near the brake fluid reservoir as shown here.
This will need checked/tested further to be sure this is the cause and requires that the fault codes are checked using a scan tool that is fully compatible with your model here.
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