Alternator replaced twice by MBZ dealer but still have P0620 code

Question

Replaced alternator twice at Mercedes Dealership and battery too but still have P0620 code. Do I need to replace the ECM module to get rid of the check engine light coming on?

Answer 1

Hi there,

It is possibly a fault in the wiring to cause this code. I would suggest checking your wiring before replacing the ECM. Here is some more info for you.

P0620 MERCEDES-BENZ - Generator Control Circuit Malfunction

Read more: https://www.autocodes.com/p0620_mercedes-benz.html