Hi, I’m new to the site and am having trouble with my w204 c320cdi, warning lights are on for my ESP and when trying to read faults, there is no communication with esp module n30/4, two faults in engine related to no communication with abs/esp unit. All fuses ok, power and earth to esp unit ok. Anyone here seen this problem or may be able to help. Have tried new second hand unit and still no communication. Thanks in advance