Missing VIN

[99STEPSIDE]

I've been attempting to upgrade my OS from the current 99 to 02. After the full reflash it indicated missing serial number , but it created one. I also noticed vin is missing?? I've tried full re-flash but to no avail. What did I miss, screw-up, etc???

1999 5.3L original os--09379910 new--12212156

[GMPX]

What version of software are you running?

[99STEPSIDE]

EFILive_Tune.exe V7.5.5 (Build 78)

[99STEPSIDE]

BTW- I decided to do reinstall original OS because of missing vin, everything looked ok. I then did a read of PCM and vin still indicates it's missing. N/A000000000000....

[joecar]

Try to write your correct vin using the scantool.

[99STEPSIDE]

Thanks for the reply. I did further research on the forum and I came across one of your old posts with the exact same help. I can do this from the bi-directional controls, right?

[ChipsByAl]

You can use the Tune tool, look for the "key" icon at the top of the screen or "Ctrl-Home"
Al

[joecar]

Yes on both.

[99STEPSIDE]

Thanks for the reply's. I'll give them a try as soon as I get a new laptop. My old one gave up the ghost last night....

[99STEPSIDE]

Thank you for your help, I was able to program vin into pcm.