I disconnected the negative lead on my battery for about 10 min, and the check engine and other lights turned off.
-- Another note: it wasn't just the check engine light and cruise control indicator that were illuminated. The traction control, abs, and other indicators had also turned on. On top of this, the tachometer and speedometer were unresponsive while the CBT was connected. --
I tried connecting the CBT again using the OBDII connector and had the same results as the first time. I am able to capture packets, but it is annoying to have to disconnect the battery after each use.
Your sequence worked for me one time, but not the next. I'll have to play around with it some more.
As far as your DTC, if you haven't already figured it out. I found this:
I don't know if it will work for the 2015, but it's worth a shot if you can spare the time.
The problem I am now facing is that I cannot access the low-speed CAN. I think I have tapped (soldered) into the right set of wires, but the CBT doesn't seem to pick up the signal