PSchwarz
Mercedes B Klasse Electric Audio Problems MOST Bus Fault
Summary of the thread
A 2016 Mercedes B Klasse Electric experienced a complete audio system failure, with navigation issues and a MOST bus fault error. The problem likely stemmed from a faulty control unit on the MOST bus network. It was suggested to get a professional diagnosis using Mercedes-specific tools to accurately identify the issue, which could prevent unnecessary expenses. Ultimately, the faulty control unit was confirmed and replaced by a specialist, resolving the problem.
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4 comment(s)
PSchwarz (community.author)
It happened suddenly No recent work or aftermarket stuff Is there anything I can check myself before shelling out for a new control unit
lea_knight7
Sudden failure and no recent work hmm While a DIY fix is possible diagnosing MOST bus issues without specialized tools can be tricky You're essentially looking for a broken fiber optic cable or a malfunctioning module in the loop Since you don't have gradual degradation the chances of a loose connection are probably low Given the cost involved and the complexity of car diagnostics these days honestly I'd advise getting a professional diagnosis A proper scan with Mercedes-specific diagnostic equipment will pinpoint the faulty component Could save you money in the long run versus replacing parts blindly
PSchwarz (community.author)
Yeah that's what I figured Bit the bullet and took it to a specialist Turns out it WAS a faulty control unit on the MOST bus just like I suspected They replaced it cleared the codes and everything is working again Thanks for confirming my fears and the advice
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MERCEDES
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BKLASSE
lea_knight7
A MOST bus fault Oh dear that sounds like chasing gremlins in your car electronics Think of the MOST bus as the nervous system of your car's infotainment – if one nerve is pinched the whole system can go haywire The symptoms you describe definitely point to a break in the optical loop Before you commit to that repair bill a few questions Has this happened suddenly or did it develop gradually Have you had any recent work done on the car's electrics or audio system Any aftermarket modifications installed