Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
This is Clay, I'm a certified master automobile technician with 30 years of automotive repair and diagnostic experience.
From your description most likely the power steering pump is at fault. Before replacing any compomnents it would be a very good idea to have all of the systems checked for any codes stored, particulary C0450. Let me know if any codes are stored in the BCM.
I hope this information is helpful. If you have any questions let me know. You can reply back to me through this thread at any time.