No Can can solve that for you
You need a logic anaylser you will need schematics, in circuit debuggers , and lots of knowledge about can bus not to mention software
Could be anything !! reciever ,transmitter , could be a line problem could be the micro , could be software Who knows
Its a specialist job ,plus you also need to know what commands your sending and responses you might be expecting and if you recieving equipment or can transcievers on the can bus are all perfectly functional
I wouldnt like to guess at that one not without all the info available and certainly not without the test equipment , analysers that you will need not forgtetting there are two standards maybe even three now relating to can bus controllers
