bq78350, reading wrong values

Hi,

I am getting some false readings from the bq78350, 

I have enabled pec to avoid just that, however, sometimes when I request pack voltage (SBS CMD 0x09), I get 3600 . this is the answer of SBS CMD 0x19 - DesignVoltage().

I tried sending a request with a wrong pec - and got an answer from the bq78350. 

Is there a way to enable pec on both directions? bq78350 -> host and host -> bq78350?