¡Ooh.

 

It doesn't have to be from a 2002, does it? As long as the Service Number matches your ECU, it shouldn't matter. My 99 Silverado has an ECU from a 2000 model. I can't recall the service right now. It's the other one, not the 0411. 🤔🤷

 

I changed to a 2002 ECU because it was supposed to have a less aggressive knock retard living in its hardware. I think that 2002 was the year that it was changed, and I think 2002 is the newest I can use. And like I stated earlier, I have licenses for 2000 and 2002.

 

I'm not positive about it though

 

Oh yes 2002 is going to be the highest computer you can use.

 

The mention that the cluster stays in "2" regardless of gear selector is at least one significant problem. As @shakenfake mentioned, likely culprit seems to point to the Neutral Safety Switch. ECU won't allow truck to crank if it is being told it's in manual 2nd gear.

Would also check for wiring integrity to the NSS switch too, prior to replacing it.

 

Maybe the ECU won't allow it to fire because it thinks that it is not in P or N, but the NSS allows it to crank because it is in P? Because it cranks just fine.

Something ain't right here.

 

That is how it works I believe.

 

So what, it's some kind of fail safe? So the NSS kills ignition and cranking? That would still lean towards multiple problems, because if the NSS thinks it's in 2, then it shouldn't allow the engine to crank. I didn't think that there was anything electronic, or I should say digitally controlled, about the starter. It should be purely electrically controlled by mechanical switches. The ignition switch and the NSS.

It's raining here now, all I can do is argue with you guys on the internet

 

Yes if the NSS sees that the truck is not in park it will not fire. I believe it should crank though.

Sounds like excuses to me