Passwaor reset on MEDALLION INFORMATION CENTER

If all else fails:

Customer Support

I tried calling Spartan (mine is on a Spartan chassis) and they had no help for this.
I have not found a password that will work yet. My local mechanic says no professionals use them as they just plug in their own computers. Spartan did warn me that if I succeeded in getting into it, I could really do damage if I changed any values by mistake.

Have you searched
This

Try 8127 as the password.

8127 worked for me. However the information I could access was near useless. I was getting check engine light due to a faulty turbo boost sensor. I ended up buying Silver Leaf for my laptop and it is very good. Found the problem in seconds. Plus you can call their very good TS.