When my vehicle is running, I can get data without issue, however is it possible to get data from the CAN when the vehicle is off, key out and everything? For example, I would like to be able to connect and get my current fuel level, battery voltage, odometer etc. Thanks again in advance!
It depends on the vehicle and knowledge about it. The vehicle needs to support some sort of wakeup and allow that to be done from the OBD port, and the developer(s) need to know how to do that.
Regards,
Michael