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PSchwarz

Mercedes B Klasse Electric Audio Problems MOST Bus Fault

My 2016 Mercedes B Klasse Electric is having audio issues The whole audio system is dead navigation is a no go and I have a MOST bus fault error stored Sounds like a faulty control unit on the bus network to me Anyone seen this before Quoted around 1000€ for the repair Ouch

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)

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

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