I am trying to connect to the CAN bus of a heavy trucks 24V OBD2 port.
I have already tested my setup with a van, and confirmed it working.
The only differences I can see between the 2 vehicle's OBD ports is that in my truck there is 0v difference between the CANH and CANL lines, and 0.3 on the van that worked.
I can't find anything online around the "issue"(if it even is one) of no voltage difference between can lines.
The truck works fine, and there are no issues reported in the instrument cluster.