I2C voltage anomaly on SDA of Pixhawk4

Hi friends,
I encountered an anomaly in my Pixhawk 4 control unit on the I2C port. The voltage on SDA is not 3.3V but 0.3V … that’s why the proximity sensor didn’t work for me! I’m pretty sure it’s a HW problem but I wanted to ask you if it could be an Arducopter version 4.0.6 problem. Thank you
@dkemxr @smartdave @xfacta

To me that sounds like a hardware problem