vivienstorm3

MOST Bus Fault

My 2017 Fiat Punto with a gasoline engine is showing a MOST bus fault. Symptoms include no audio output, the audio system being completely non-functional, and the navigation system not working. An error is stored. Thoughts on diagnosing a MOST bus issue?

A 2017 Fiat Punto is experiencing a MOST bus fault, resulting in non-functional audio and navigation systems. The issue is likely due to a defective control unit on the bus. Diagnosing the specific faulty unit can be complex without specific error codes, and specialized diagnostic equipment or professional expertise is recommended. The problem was confirmed to be a faulty control unit, which was repaired at a cost.

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4 comment(s)

MOST bus faults are tricky. Given the symptoms, a defective control unit on the bus is highly probable. Have you scanned the car with a diagnostic tool to pinpoint which control unit is throwing the error?

Yes, I scanned it. The error points to a general MOST bus fault, but not a specific unit. Is there a way to isolate which control unit is failing?

A general MOST bus fault with those symptoms strongly indicates a hardware issue within one of the connected control modules. Without specific error codes, isolating the faulty module is complex and often requires specialized diagnostic equipment. I would recommend consulting a workshop with expertise in automotive electronics.

Thanks for confirming my suspicions. Took it to the workshop, and it was indeed a faulty control unit on the MOST bus, cost me 1000€ to repair.

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FIAT

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PUNTO