SMA Computer Core Upgrade.....

[tomp]

I think you might be outta luck. Sorry for that...

Sounds as if you might have to get a new OEM ECM & start from there, if this is something you just gotta have...

[1GaNole]

I'm sure I'm not the only one with this issue as thousands of hummers owners have this option added. Jacked it up 50+ HP and with the eldelbrock headers, borla duel exhuast, k & n cold air intake I'm pushing 400 hp...

[tomp]

You can try to see if dealer will/can reprogram for tire difference for speedo cal...

[H2 Ranger]

Give these people a call and I think they can sort out your issues.
Nelson Performance (210-626-0278). Let us know when you get it sorted.

[1GaNole]

Wow, Great !! I'll call first thing Monday and see what they can do. Thanks for the tip.