mariemaier1
Mercedes X Klasse Diesel Reduced Power Issue
Summary of the thread
A 2020 Mercedes X Klasse diesel experienced significantly reduced power, suspected to be caused by a defective engine control unit (ECU) potentially due to a faulty main relay. The issue was confirmed by an error code, and there was concern about possible ECU damage. The main relay was replaced, resolving the power issue without further damage to the ECU, thus avoiding a costly repair.
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4 comment(s)
mariemaier1 (community.author)
I don't have the specific error codes. Assuming the main relay is the source, what's the likelihood that replacing it would fully resolve the problem, or could there be consequential damage to the ECU requiring extensive ECU repair?
EmmDrive
Replacing the main relay might address the issue, assuming it's the sole cause. Without knowing the specific error codes or conducting further tests, it's difficult to say. If the relay failure caused a surge, it could have damaged the ECU itself. Seek assistance from a qualified workshop to perform thorough car diagnostics.
mariemaier1 (community.author)
I took the vehicle to a workshop. The main relay was replaced, which resolved the immediate issue. Fortunately, there was no consequential damage to the ECU, avoiding a costly ECU repair. All seems well, thank you again.
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MERCEDES
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XKLASSE
EmmDrive
A defective ECU with those symptoms suggests a deeper issue. Reduced engine power and stored error codes typically point to more than just a system reset. While a faulty main relay could be the culprit, it's not always straightforward. What specific error codes are you seeing?