CGDI MB “Read data failed” Error Solution

CGDI MB Read Benz Tcu failed, beeps and appears “read data failed” message. What’s the problem and how to solve it?


Please remove the TCU from the Benz car, and connect to a CGDI EGS & FCU Testing Cable (see the figure below) to work with CGDI Prog MB on bench. If still cannot read data, please add a 120 ohm resistor between CAN-L and CAN-H cables.