you will need the "service" level password. if you don't have it, you will most likely need to have your local Yale forklift dealer send a tech with the laptop to reset it. Since you are going to have to pay for that service, you may as well get him to calibrate the transmission for you. (it is not a trivial series of things to do, but should take less than 1/2 hour for someone who has done it a few times). as far as clearing codes, same thing, you need the correct service level password, which can and does get changed.