New computer need guidance already bricked one

[blindsquirrel]

There is no one single VIN that will cover this, 'this' being an existing '07 Corvette pedal and TB, and existing ECM service number, and a T42. Your "(not difficult)" is not as straightforward as you think.

The only years that work with the 12603892 ECM service number are 2006 and 2007. The only auto trans in '06-'07 Vettes was T43. A '07 non-'Classic' truck ECM OS ('06 trucks were all still P59s) will not work with the existing Corvette pedal/TB.

Which parts should be replaced to make it work using a single VIN?

The '07 Vette ECM OS will work with any pre-'09 TCM OS whether it's a T42 or T43. T42s can be properly fully flashed using HP Tuners and a write-entire as long as the file being written is licensed first. Buying a T42 pre-flashed to either the '07 Suburban or '08 Express 4L80E VIN will work with the existing ECM and ECM OS and not require spending another 2 credits just to license a different TCM file.

[Tody'shop]

There is no one single VIN that will cover this, 'this' being an existing '07 Corvette pedal and TB, and existing ECM service number, and a T42. Your "(not difficult)" is not as straightforward as you think.

The only years that work with the 12603892 ECM service number are 2006 and 2007. The only auto trans in '06-'07 Vettes was T43. A '07 non-'Classic' truck ECM OS ('06 trucks were all still P59s) will not work with the existing Corvette pedal/TB.

Which parts should be replaced to make it work using a single VIN?

The '07 Vette ECM OS will work with any pre-'09 TCM OS whether it's a T42 or T43. T42s can be properly fully flashed using HP Tuners and a write-entire as long as the file being written is licensed first. Buying a T42 pre-flashed to either the '07 Suburban or '08 Express 4L80E VIN will work with the existing ECM and ECM OS and not require spending another 2 credits just to license a different TCM file.

This is where i think i'm screwed. I have yet to a service number the same as mine from another vehicle. My service number on the ecm is 12597121 with an OS number of 12614679. So i ges my quistion is could i rig up a bench harness to run a t42 and do a segment swap alone? Or could i take like the ecm from the escalade i have and use it to change the t42 since it has more service numbers that actualley are the same as it?

[blindsquirrel]

No segment swap. It needs the whole 4L80 operating system given that you're starting from some FWD thing.

As for ECM service numbers...
https://www.rockauto.com/en/moreinfo.php?pk=984663

More Information for GM GENUINE 12597121

OEM / Interchange Numbers: 12603892

They are the same thing, just an updated number.

[blindsquirrel]

An Escalade ECM with an Escalade ECM OS in it would need a truck pedal & TB and wouldn't solve any of the other problems with putting the right OS into the TCM or what I still suspect are wiring problems in your harness that are causing all these stupid comms issues you keep getting. That's not normal, and it's not going to work right even after you get everything programmed until whatever is causing that is found and fixed.

[Tody'shop]

Ok i'm thinking outside the box a little but is it possible to take the escalade file with the t42 file and change the t42 then take the t42 file and add to the vette file after its been changed? Here is the file for the escalade and the problem with it was the ecm wouldn't talk to the TB and Pedal and OS stuff, but since it won't be used just the tcm would that work?

[Tody'shop]

Dang you was thinking what i was. LOL I'm about to go out and go threw the wiring again and see what may be the issue. Thanks again for youir help.

[blindsquirrel]

Was an Escalade ever built with a 4L80E? If it was, and that's what you have, and it's a 2009 or older, then yes, you can use that TCM and OS. However if it's from a 4L60E truck then that gets you no closer than you are now with the Impala TCM/OS.

The way you make a tune file with ECM 'A' and TCM 'B' is you plug them in and do a read and save the file. You do not need to bother thinking about making a file that is only the TCM that you can later use to combine with... whatever.

[Tody'shop]

Ok i get what your saying. I was thinking later on that i have the file alone but couldn't figure out how too separate after the fact. But i thought about how i got it alone and then wondered but it would be a 100$ gamble. If i could swapp evertything as the escalade file and then hook the bricked ecm to the tcm and reread then it would be alone again at its new form and could add back too the new ecm. I'm reaching now sorry too bother you with dumba$$ ideas just adhd kicking in.

[Tody'shop]

Ok i am going threw the wiring again and had the pinouts saved in my phone and it got run over and my new phone didn't get some stuff when transfered over. That being said i just went threw 4 06-07 corvette pinouts for e38 and all 4 is differant. How can i get a pinout that is what i need. I had an os or service number pinout but like i said it didn't make it. I now see why Blindsquirrel and well most everyone ask where the harness comes from first when somebody has quistions. It's mind boggling how the same thing is so differant. Anyway thanks for the help. here is my file if it helps.

1980 z28 stock pcm only.hpt

I have this e38 pinout thing but some of its differant also.

E38 Complete Pinout.pdf

[blindsquirrel]

Document ID 1819097.pdf

[Tody'shop]

Document ID 1819097.pdf

Thank you i appreciate it.

[Tody'shop]

Ok i went threw the wiring and found one wire the #18 on J2 the Accessory start up wire and it went to nothing so added it to 11 on tcm. I still can't get a complete write entire to kill vats. I got aggravated wripped the tcm out all together and tried that and still no go so figured F it and tried a write calibration and went threw and completed the first time. Tried write entire again nope the highest it made was 51% and timed out. Well wripped the PCM out and unpinned every wire and hooked up the 2 pink wires too a 12v switch, 2 gmlan, ground on 13, and 12v to 20 and hooked up a dtc port and powered with a 12 volt power supply thats actualley 13.6 switched on and it will write calibration but still will not write entire. Also all the stuff in OS screen is greyed out and alot of stuff in the tune is greyed out also. Is the greyed out normal? Any thing i may have wrong? I looked at the info and will try to put it below with the file.

VCMSuiteInfo 1-17-24.txt

stock z28 with vats delete.hpt

This is the file i'm trying to load with only the vats patch saved.

[edcmat-l1]

Did you read out the file that's in the PCM now? Can you post that? Sounds like there must be some compatibility issues with the OS.

[Tody'shop]

Did you read out the file that's in the PCM now? Can you post that? Sounds like there must be some compatibility issues with the OS.

Yes that's the file of the computer i ordered with my vin, it's what Blindsquirrel had said would be best thing since i didn't have a way to do it myself. I was done by SpareEcm and i figured they would be better than one of the cheaper companies on ebay. They were middle of the road on price and actualley had warrenty but i figured with what i was doing it was voided anyway but at least he offered one.

[gtstorey]

I would see if the existing file will reread and post that unedited file on here.

[edcmat-l1]

Yes that's the file of the computer i ordered with my vin, it's what Blindsquirrel had said would be best thing since i didn't have a way to do it myself. I was done by SpareEcm and i figured they would be better than one of the cheaper companies on ebay. They were middle of the road on price and actualley had warrenty but i figured with what i was doing it was voided anyway but at least he offered one.

That's Rodney I've dealt with him many times over the years. He's a stand-up guy. Knows what he's doing.

I've got a stack of E38s I'll see if any are compatible. I've got your tune file and unlimited credits so no cost for me I'll try flashing your file and see what happens.

[blindsquirrel]

If I'm following this right, the ECM has been written with the edited file, but only as write-calibration. So what's in there currently is not the 100% untouched file. Hopefully that was saved before starting and still exists.

I too would like to see the read of what's in it now, though that file shouldn't be used for anything in the future given the VATS changes vs. the write-calibration thing.

[blindsquirrel]

Does it still have the same issues as before with the scanner connecting and getting live data?

[Tody'shop]

Does it still have the same issues as before with the scanner connecting and getting live data?

Yes it did so thats when i took out the tcm completely because of the newer tcm and all that issue. The file i posted was the one i was trying to load. I haven't changed anything but the vats enable vs disable. Here is the file from the initial stock read. Also i don't know if i means anything but in the os deails the cvn number is different on main system and fuel system but the rest are the same. The T button is messing up on keyboard if the spelling is to bad.

1980 z28 stock pcm only.hpt

This is out the box plugged up and read.

[gtstorey]

One reason I mentioned a reread is to check if any of the attempts to write had corrupted the file. Although I don’t know if you would see any corruptions since we can’t view the entire file.