Okay...not starting a "who's reference is more correct" argument, but......
I'm staring at my 2012-2014 GL1800/A GL1800B/BD Service manual.....
pg 4-13
Code 18: CMP Loose Sensor / No Signal
Code 19: CKP sensor no signal
pg 4-27
DTC 18-1 (CMP Sensor) Troubleshooting and Diagnostics
pg 4-28
DTC 19-1 (CKP Sensor) Troubleshooting & Diagnostics
So, I'm truly confused as my Honda Dealership "verified" the Code 19 as the Crank Position Sensor
....grumble....