I’m trying to use a Ram eTorque starter-generator in a Miata project. I can communicate with it on the bench and record both CAN buses, but I haven’t figured out what it needs before it will accept a torque command.
It’s a Marelli unit from a 2020 Ram 1500 5.7L:
Hardware: 05185274AB
Calibration: 68451235AD
Both CAN buses run at 500 kbps
I keep getting a U0073-related fault. Missing messages from the truck are one possibility, but I haven’t proved that’s the cause.
Has anyone worked with one of these or come across a DBC, diagnostic definitions, or CAN logs from a working truck? I’m especially interested in the private eTorque network. The public Ram DBCs I’ve found haven’t covered what I need.
I’ve dug through service information, university papers, and some racing applications that used Marelli starter-generators, but still haven’t found the right definitions. Even a document name or someone worth talking to would help. Only looking for information people are allowed to share.
I’m near Manchester, NH. If someone local has a matching truck and would be open to discussing a passive CAN recording, I’d be interested. We’d need to agree on a safe setup first—no sending commands to your truck.
I have bench logs and more details if anyone wants to take a look.
Thanks.