ironduke wrote:bojimmy35 did you try writing the same vin back to that 2010 Express van ecm? Vin 1GC2GUBG9A1184016? I'm guessing that works ok but changing it to a different vin fails..
I have run into it before where I couldn't change the vin, except I did find out that I could write the vin right after a sps programming event.. Not sure why though? even just pushing the gm sps write kernel didn't do the trick, I had to write the calibrations at a minimum.. that might be something to try if your able.. Do you have unlimited access to sps? or do you have to pay ver vin? Do you need this ecu to be changed or are you just goofing off like I do all the time? lol..
I see the differences in the vin location and I see in the xml where kurd4o and joukoy are doing the figuring for that, sorry but it's over my head.. request 1A 90 is for the vin and 1A 28 is for partial vin, but I've always been seeing the full vin with that request. I see 2 sports for the vin and they match so that makes sense, I just don't know howto determine where it is like they have.. Other than that they do look like good bins, hopefully the 2 of them can get it figured out..
Sorry forgot to initially try that. It does work to write the same vin back in by either simply leaving the field blank or manually typing the same vin in.
So I pay per vin for sps/techline. On a hunch while trying to make this post, I tried a different bench harness I made that powers both the tcm and a bcm on the canbus not just a standalone ecm. This allowed the tool to successfully change a vin on the 2010+ ecm. When I attempted to change it back I am now getting the same error as before. So it has now been incremented 1 but won't go back down to its original vin now.