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And when I said diagnose as a no crank, that goes way beyond starter and starter signK

Still can’t be done with HPT. Since the HPT tune won’t contain the throttle control segments.

HPT doesn't read the throttle control segments so if it truly empty it would have to be programmed with through GM website with no HPT tools.

But I still don't believe it is empty.
For everyone...

To me 10% is excessive, I would rather keep it below about 5%. Get more logs on long, typical drives and see what it does.

Still might be a power issue. The ECM might not even be awake or powered up. Forget the tune and start by trouble shooting this as a no crank. Unless you know of something that happened, just setting...

No matter what tuning you do with the wideband, if you run the vehicle in closed loop it's going to be using the narrowbands anyway so you might as well adjust it so the closed loop tuning is closer...

No, you don't want to write a file from the repository to your ECM. At least on a lot (most?) of GM's.

But way too soon to think that the ECM is shot.

And do you have any version of your tune?...

What makes you think the last file loaded onto the ECM isn't there?

I don't think adding any fan to 50+mph will make a difference.

Fuel Injection Clinic or Fuel Injection Connection?

Attach the data sheet.

HP Tuners included those tables for a reason, so I'm going to change them.

Really, it's usually all related, you just don't realize how.

If you don't know which side you wired it to, disconnect one and see if the one that responds in the log stops working.

This is a swap that you did the wiring on? Which side did you connect it too?

Are you running narrow band one side and wideband the other? If so, I would put in both narrowbands and compare.

https://forum.hptuners.com/showthread.php?107504-Turbo-5-3-tahoe-fuel-issues&p=762381#post762381
Do people not remember that they have existing threads when they start new ones?

People sure can be sensitive to what random people on the internet think about them.

Typically “return” style fuel system means vacuum regulated and c5 means constant pressure. Which are you trying to do?

Did you play with polling frequency?

I would try and see if it is different pressure on hot and cold starts. Somewhere around 70-75 psi is where Alvin says that the Injectors will have trouble opening so that may be the problem.

Is that 70psi on both hot and cold engines?

Best to be asked for the particular vehicle in the specific forum section. They all have different OEM strategies and different things available.

Does this not sound like a bad switch at the transmission shifter or on the trans itself?

I have to admit I would follow the instructions and contact support.

Read is a full read on GM as long as the module is selected. Write can be calibration only or entire. At least on the older stuff. If it was me, I would hook it and see if it has any options for...