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walterlight1

Mercedes E Klasse control unit communication error

My 2021 Mercedes E Klasse with a diesel engine is acting up It has 180340 km and I am getting a control unit communication error The check engine light is on the engine overheats and there is coolant spilled under the car from pressure Is it a wiring issue or a control module fault

Summary of the thread

A 2021 Mercedes E Klasse with a diesel engine is experiencing a control unit communication error, leading to the check engine light being on, engine overheating, and coolant leakage. The problem could stem from either a wiring issue or a control module fault. After a diagnostic scan, it was determined that the issue was due to a defective plug connection, which was promptly repaired.

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4 comment(s)

lisacrystal9

Sounds rough I had something similar with my E Klasse though I didn't have the coolant leak The check engine light and communication fault were the main issues Is it possible it's a software glitch I wonder if the data link to one of the sensors is acting up which could cause weird issues

walterlight1 (community.author)

When you say data link acting up are you talking about a physical connection problem or is it more about the software itself I am not sure if I should be chasing a wiring issue or if I need to start thinking about a software installation and I am not sure where to begin

lisacrystal9

Honestly it's hard to say for sure without diagnostics but my gut feeling leans towards a cable or plug connection of the component being defective With these cars so much relies on the control module getting the right signals I'd suggest a workshop and a proper scan It saves guesswork

walterlight1 (community.author)

The issue was a defective plug connection They ran a diagnostic scan and found the error right away The repair cost was 95€ I appreciate the help

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MERCEDES

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EKLASSE