felixphoenix2
Citroen DS5 MOST bus fault
Summary of the thread
A 2017 Citroen DS5 experienced a failure in the audio and navigation systems, with an error indicating a MOST bus fault. This issue is likely due to a problem with one of the control units on the fiber optic network. A similar case was resolved by replacing a faulty control unit, suggesting professional diagnosis and repair are advisable. In this instance, a faulty amplifier was identified and replaced, resolving the issue.
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4 comment(s)
felixphoenix2 (community.author)
Thanks for the reply. Did you manage to fix it yourself, or did you take it to a workshop? And do you remember which control unit was faulty?
achimmaier9
I'm not really that tech-savvy when it comes to car electrics, so I took it straight to a workshop. They diagnosed it pretty quickly and replaced a faulty control unit. If you have the same issue, it's probably best to let professionals handle it.
felixphoenix2 (community.author)
Ok, thanks for the advice! I'll take it to a workshop and have them check the control units. I suspected it was a deeper issue than just a fuse. They found a faulty amplifier, it cost me 1000€ to fix. Hopefully, that sorts it out.
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CITROEN
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DS5
achimmaier9
I also own a DS5, and I had a similar issue a while back. No audio, no navigation, just a dead system. Sounds like a problem with one of the control units on the MOST bus. It's a fiber optic network, so any break in the line can cause problems.