retsurg

I have a 2015 SLK 350, shows distronic plus inoperative, the front two sensor (on the grill) was shown to be at fault and was replace. Still inoperative. Scanner shows voltage fault at the ESP ABS control module. The input voltage to the ESP/ABS module is only 5V instead of 13 or so Volts.
Totally baffled. Anyone has any ideas?

Thanks