I apologize in advance if this is a dumb question.
I am trying to help my neighbor diagnose his 2011 Chevy Suburban, it has a P0300 code. I noticed in process that it never goes from V8 to V4 and I decided to pull the tune to take a look, while reading the tune I noticed the FSCM said CTS-V. Is this normal or does this indicate a changed component.
Here is the screenshot
Screenshot 2021-01-17 162710.jpg
I know this isn't a diag thread, but since I anticipate multiple questions.
1. Checked Fuel Pressure
2. Data logged and misfires mostly occurred on Cyl 5, with misfires on 3 and 7. I swapped 1 and 5 coil packs with no change. The most recently test drive had them mostly occurring on Cyl 6, with some on other cylinders.
3. He had put plugs, wires, and a few coil packs on before he brought it to me.
4. On 2-3 occasions I have got a Cyl 5 misfire and once I got a Cyl 6 misfire.
Feel free to PM me, I have some theories, but wouldn't mind bouncing off someone.
All that said, I just wanted to confirm if it saying FSCM is from CTS-V is normal or something is changed.