I have a similar issue that I keep getting the fault code and comes back right after I clear it. A0B1 which says its for" SG Input P N" but my gear shifter works flawlessly.

But I do see in my service history sheet that the hand brake button was replace back in 2011 and maybe the they didn't reset properly? Is resetting different than just clearing the codes?

Let me know what you end up finding I think our issue might related.