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LTC6804-2 PEC error next to a high voltage motor inverter


I am developing BMS slave devices based on the LTC6804-2 IC. I put the BMS salves into an electic vehicle and when the 3 phase motor inverter starts to work it causes a lots of PEC errors on the isoSPI bus. When the motor inverter is not working i got no CRC errors. I think the inverter operation make some noise on the isoSPI bus. I put to the same environment the DC1942CFA eval board and then i got no PEC errors. My suggestion is that there is some board design difference between the two boards because the components of the two boards basically are the same. Could you please give me some advice about the design to make it more EMI protected or some ideas what things should i change to get rid of the issue? I attached the BMS salve board 3d picture.

Thank you very much,