Engine Boiling Over Sprinter Control Unit Problems

Sounds frustrating! I had something similar happen with my Sprinter. The symptoms sound familiar. Overheating and coolant spills can be scary. Have you checked all the cable and plug connections? The control unit can throw fits if it's not getting a solid signal. It's like a bad phone connection, you know?

I checked a few obvious connections, but there are so many! Which cable or plug connection are you talking about specifically? Was it related to the cooling system directly or something else that triggered the overheating? Did your car diagnostics tool also show the same communication fault?

Honestly, I'm no expert. My car diagnostics tool was showing similar communication fault codes. To be safe, I would suggest taking it to a workshop. They ran some tests and found a defective connection. I would hate for you to keep poking around and make things worse. Just my two cents!

Thanks for the advice! I took it to a workshop, and you were spot on. It was a defective cable connection to the control unit, just like you thought. They fixed the connection, cleared the codes, and now it's running perfectly. Total repair cost was 95€. Appreciate the help!