walter_schulze10

Seat Ibiza MOST Bus Fault

I'm pulling my hair out here My 2017 Seat Ibiza with a diesel engine has completely lost its audio and the navigation system is dead too. Car diagnostics throws up a 'MOST bus fault' error. So, basically, the whole infotainment system is bricked. From what I've gathered, the MOST bus is like a backbone for data transmission between different control units in the car using an automotive protocol for communication. If one unit glitches, the whole bus network goes down. Has anyone else battled with this automotive protocol before? Thinking it's going to cost around 1000€

4 comment(s)

Whoa, that sounds like a nightmare I had a similar thing happen in my old Vauxhall Astra, though not exactly the same. Everything entertainment-related just died. They called it a 'data transmission error' and mentioned something about a 'bus network'. Is that the same type of thing?

Yeah, the error code pointed to a fault in the MOST bus. Sounds like the same sort of bus network you're talking about. What exactly was failing in your Astra? Was it a specific control unit, or just a general communication breakdown?

Okay, so the Astra... They initially suspected the head unit, but after some car diagnostics, it turned out a faulty Bluetooth module was spamming the bus with garbage data. The garage said it was disrupting the whole communication flow. Honestly, unless you're super confident with car electrics, I'd get it to a workshop. Those bus network issues can be tricky to trace.

Alright, the Ibiza went to a trusted mechanic. A faulty amplifier module on the MOST bus was the culprit, just as suspected. New module, coding, and labor came to about 1000€. Painful, but at least the audio and nav are back. Thanks for the heads up about the MOST bus thing It saved me some time explaining it all to the garage.

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