My 2017 LT threw this code earlier today and it was caused by operator error on my part. My car port has a threshold bump that must be driven over (pulling in forward facing) and as soon as my rear tires hit it I shift into neutral and let the car's momentum carry it completely over. I do this in case I accidentally hit the gas so I won't hit the wall in front of the car which is close. Today when doing this I still had my foot on the gas while the car was rolling and shifting into neutral... The MIL light came on immediately with P3260 and P0AC4 both set. After reading this thread cleared the codes, drove in both normal and hold modes with no further issues. Thanks for the earlier posts that described the P3260 fault... I immediately realized what I did caused it.