KlaraBee
Starting difficulties with Benz X Class 2018: Possible malfunction of the main relay of the engine control unit?
(Translated from German)
Summary of the thread
A 2018 Benz X Class is experiencing starting difficulties, potentially due to a malfunction of the main relay of the engine control unit. A similar issue was resolved in a 2015 Benz S Class by replacing the main relay, which restored normal function. The suggested solution is to consult a mechanic to confirm and address the issue, as it is a fixable problem.
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4 comment(s)
KlaraBee (community.author)
Hey, thanks for the quick reply and the support! Searching the net only led to more confusion for me too. It's good to hear that your mechanic was able to solve the problem. Do you happen to remember what you paid for it? And has anything similar happened again since then? Thank you again!
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SophiaWonder
Hey, glad I could help! The repair of the main relay cost a pretty penny, I had to fork out €120 for it. But since then my Benz has been running like clockwork, no more problems. After the mechanic got to it, the malfunction of the main relay of the engine control unit was solved. So don't panic, it'll be fine! Good luck!
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KlaraBee (community.author)
Hey, great, that's a relief! 120 doesn't sound like a bargain, but if it solves the problem and gets my Benz running again, it's worth it. Your experience has helped me a lot. Off to the garage with it! Thanks again and hopefully this problem won't happen to either of us again! All the best!
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MERCEDES
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XKLASSE
SophiaWonder
Hey, your guess could well be correct. I drive a 2015 Benz S Class and had a similar problem about a year ago. In particular, I noticed that the car stuttered and sometimes wouldn't even start. After some back and forth on the internet, I came to the conclusion that the problem could be with the main relay of the engine control unit. I went straight to my garage and the guys confirmed my suspicions. They had to replace the main relay, sometimes that's the way it is, even if it's annoying. It was a bit of work, but not a problem that couldn't be solved. So, don't worry, you'll manage that too. Just take it to the mechanic and tell him everything. Good luck!
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