Note: The following article is a best-effort reference for our customers and is provided "as-is" without any express or implied warranty. does not provide detailed troubleshooting as these are potentially complex tuner problems, not unlocking ones. Please proceed at your own risk.

This doesn't happen very often, but if after purchasing the Overdrive Software Unlock you are not prompted for a code there are a couple of things to check.

First and foremost - the Cummins Overdrive Software only works on 2006-2012 Dodge Cummins 2500/3500 trucks with the 48RE/68RFE automatic transmission. Dodge Cummins Cab & Chassis (4500/5500) trucks with the Aisin transmission are NOT compatible.

Another possible cause is the XRT Pro/Mini Maxx can't read the data from the TCM (Transmission Control Module) properly. The tuner queries which transmission that the truck is equipped with, and if if the response data is corrupted, or it doesn't recognize the firmware part number given, then it will not present the user with the option for the Overdrive tuning.

Check your SHOW SETTINGS menu and look for TCM P/N. If it shows a series of white squares (instead of a part number or serial number), then your data is corrupted and you should update your tuner to refresh the data files.