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DCAN1 J6 EVM works fine in the loopback mode and not in the normal mode

Hi 

I am working on a J6 EVM and working on developing a DCAN driver.

After initializing all the CAN settings, loopback mode test communications happen correctly.

no Tx errors, no Rx errors, all received.

Tx pin also shows activity using the oscilloscope.

 

but when in normal mode, Tx pin is always high, and no activity is seen on this line.

What could be wrong? 

i have pull updown disabled on both dcan1 tx and rx.

any clues are appreciated - thanks

KR