When connecting to a newer truck with a Cummins and Allison, I am having trouble reading the vehicle parameters.


The issue is most likely that the truck is utilizing the ISO (DL2) data link to connect the shifter to the transmission. Tech Tool is then trying to read the parameters from the shifter and transmission causing the interference. Pull the fuse(s) for the Allison transmission and try again.

Click here to return to the most common questions.