Common Mode Voltage Shift: The Three Thousand Five Hundred Dollar CAN Bus Noise Problem You Didn’t Know You Had
We got the call on a Tuesday. A fleet telematics provider had twenty data loggers failing intermittently across a mixed truck fleet. Every few hours, the CAN bus would lock up, then recover. No DTCs, no damaged wiring visible. The field techs swapped loggers, replaced OBD connectors, and even flashed new firmware. Nothing fixed it. Finally, an engineer […]