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karen_frost1

Espace MOST Bus Audio Failure

I'm freaking out. My 2023 Renault Espace, hybrid engine, with 51253 km, suddenly has no audio. No radio, no music, nothing. The navigation is dead too. A code reader shows an error about the MOST bus. Data transmission? Bus network? What is that? Anyone experienced this? What am I looking at?

Summary of the thread

A 2023 Renault Espace experienced a sudden loss of audio and navigation, with an error code indicating a MOST bus issue. The MOST bus is a fiber optic network that connects multimedia components, and a break in this loop can cause system failures. The problem was likely due to a faulty control unit on the MOST bus. The recommended solution was to consult a Renault specialist for diagnostics, which confirmed the issue and led to the replacement of the defective control unit, restoring the system's functionality.

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4 comment(s)

marvinfrost33

MOST bus issues can be a headache. It's how the multimedia components communicate using fiber optics. If there's a break in the loop, things shut down. Losing audio and navigation points to a problem with a control unit on that bus. The error code confirms it. Have you had any work done that might have involved disconnecting components? Like the amplifier, head unit, or navigation module?

karen_frost1 (community.author)

Thanks! Fiber optics sound expensive. I haven't touched anything! It was running fine, then silence. If it's a break in the loop, can I pinpoint the faulty component, or do I replace everything until it works?

marvinfrost33

Pinpointing the exact component without diagnostic tools is tricky. Because it's a loop, one faulty module can knock out the system. It could be a loose connector, or a module failure. Given the symptoms and the error code, it's likely a defect in a control unit on the MOST bus. I recommend taking it to a workshop familiar with Renault systems and MOST bus diagnostics. They can use a tool to read the bus and identify the culprit.

karen_frost1 (community.author)

Thanks for the advice. I was hoping for a simple fix, but I'm out of my depth. I'll book it with a Renault specialist. I got the car back from the workshop and you were spot on! A control unit on the MOST bus had failed. New part and labor cost 1000€, but I have my tunes and navigation back!

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RENAULT

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ESPACE