I must join everyone here to extend my personal thank to @bit1817 for doing the write-up. Without it, I don't know if I would have the courage to try it out myself or not.Thanks for the feedback, everyone! I just updated the guide to address common issues and changes.
Just a short update that I was able to drive around all day yesterday and today and no SHVCS error shows up again. I was also able to recomplete most of my emission monitors except for the O2 sensor for the smog test, without having to drive for 100 miles or several days on gas like some of the dealers suggested. I've also heard of a suggestion to drive 500 miles on gas from a repair shop right next to the smog test facility.
To restore most of my emission monitors, I just depleted my battery then ran in Mountain Mode (not Hold to make sure that the ICE doesn't shutdown at times automatically) for about 15 minutes at 65 mph on the freeway until I got home to get the engine nice and hot. Then park overnight for >8 hours. The next day most of my monitors were set except for fuel system and O2 Sensor. I then followed the GM drive cycle recommendation to drive on gas at a constant 55 mph for at least 3 minutes. It's supposed to complete my O2 Sensor and my Fuel System monitors. But it only completed the Fuel System one, my O2 Sensor remains the only incomplete monitor now according to the Torque app. I guess I could have incorporated this 55 mph constant speed for 3 minute procedure with my first drive as well, if I had known ahead of time that this needs to be done to set the O2 sensor and fuel trim system.
The AZ emission test allows for 1 Not Ready monitor, so I think I'm going to take my Volt in for the emission test tomorrow anyway, despite the O2 Sensor monitor still incomplete. But if anybody has a suggestion on how to complete the O2 Sensor monitor, I'm all ears.
Update: another 3 minute drive in ICE mode at constant 55 mph on the freeway this morning on the way to the smog test helped cleared my last monitor, the O2 Sensor. Not that I needed it because I'm allowed 1 incomplete, but at least it's good to know that you don't have to drive 500 miles or even 100 miles to restore the emission monitors like the dealers tend to lead people to believe. In my case, it took 3 short drives of about 15 minutes each. But in hindsight now, I could probably have combined it all into a single drive of about 20 minutes altogether to restore all the emission monitors.