florianwolf1
Grandeur MOST Bus Fault
Summary of the thread
A 2011 Hyundai Grandeur experienced a complete audio system failure, with diagnostics indicating a MOST bus fault. The suspected cause was a faulty control unit on the fiber optics network. After checking fuses and confirming no aftermarket installations, it was suggested that pinpointing the exact faulty module without advanced diagnostics would be challenging. Ultimately, a shop visit confirmed a faulty amplifier on the MOST bus, which was replaced to resolve the issue.
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4 comment(s)
florianwolf1 (community.author)
Fuses are good, checked them twice. No aftermarket stuff installed, everything is factory original. Is there a way to pinpoint which control unit is causing the problem without replacing them all?
AnBeck19
Pinpointing the exact module on a MOST ring without advanced diagnostics tools is really tricky. It could be the head unit, the amplifier, the nav module, or even something seemingly unrelated that's hanging off the bus. Honestly, unless you have access to a proper Hyundai diagnostic system that can talk to each module individually, you're probably looking at a shop visit. Brace yourself, those MOST bus repairs can be pricey.
florianwolf1 (community.author)
Thanks for the info. Took it to a shop, and they confirmed it was a faulty amplifier on the MOST bus. Repair cost me 1000€ to replace. Annoying, but at least it's fixed now.
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HYUNDAI
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GRANDEUR
AnBeck19
MOST bus issue on a Grandeur, huh? That's a less common one. Are you sure all the fuses are good? And has any work been done on the car lately? Aftermarket stereo install or anything like that? A failing module can bring the whole thing down, so the diagnostics are probably right.