mariomeier1
V Klasse Diesel ECU Problems
Summary of the thread
A 2015 V Klasse diesel experienced reduced power and logged an error, suspected to be related to the main relay. Diagnostics confirmed an ECU issue, and replacing the defective main relay resolved the problem. It was suggested to consult a professional for complex ECU issues, but in this case, the relay replacement restored normal engine control.
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4 comment(s)
mariomeier1 (community.author)
Yes, car diagnostics confirmed the ECU issue and the error is stored. Did replacing the relay fix your engine control?
victoriaheld1
My issue was more complex than just the relay. It required ECU repair at a workshop with specialized tools. Given your symptoms and the error code, I recommend consulting a professional.
mariomeier1 (community.author)
Thanks for the insight. As suspected, main relay was defective. Replacement done. Total cost: 120€. Now the engine control works as expected.
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MERCEDES
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VKLASSE
victoriaheld1
I had similar symptoms with my V Klasse. Error codes pointed to the engine control unit. Have you done any car diagnostics or tried a system reset? ECU problems can be tricky.