I just got my upgrade in the mail from serial to USB.
I am trying to connect to a DuraMax diesel. I have not purchased credits for this vehicle yet.
When I plug in to the vehicle and hit read calibration it brings up the window that allows me to begin the read. I thought this was odd as I expected to be prompted to license the vehicle. It says it is going to take about 7 minutes to read the VCM. This seems strange as well as the other cars only take 1.5 minutes. Anyway, after about 3 minutes, it says it is going to read the TCM, and then ends with a TCM read failed at location 0 Error: Timed out.
I tried multiple times and it did the same thing.
Why don't I get prompted to buy credits when I hit "read calibration"?
Why does the read go for 3 minutes and then fail?
Thanks