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There is a dissector for J1939 if you look at the Wireshark source code.

I also see Controller Area Network (CAN) options in Protocols from the Wireshark preferences.

I think you could try decoding J1939 if you can provide the data in a packetize file format Wireshark understand.

As an alternative, you could also try importing from a HEX dump of the packets.

Not sure how to capture J1939/CAN data. Sorry.

Hope this helps.