manfredeis97
V90 Alarm Communication Fault
Summary of the thread
A 'Siren communication fault' error on a 2023 V90 diesel indicates an inoperative alarm system, potentially due to a defective cable or plug connection to the siren. A slightly degraded battery could also cause communication issues with the alarm system. Checking the battery voltage and inspecting wiring connections for corrosion are suggested steps before committing to repairs. If unsure, seeking professional diagnostics is recommended to avoid further complications.
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4 comment(s)
manfredeis97 (community.author)
Thanks. I haven't explicitly checked the battery voltage, though the car starts fine. Could a slightly degraded battery still cause communication problems with the alarm siren specifically? Anything else I should be checking on the wiring before taking it in?
ninasmith1
Yeah, even if it starts fine, a slightly weak battery can mess with sensitive electronics. If you're already suspecting the wiring and connections, and you're not super comfortable digging around, honestly, it might be worth just getting it checked. I ended up doing that and they found a corroded connector. Cost me less in the long run than chasing ghosts.
manfredeis97 (community.author)
Understood. Good to know about the battery and corroded connectors. I'll schedule a diagnostic appointment. The workshop estimated the repair around 95€, for anyone else who runs into this.
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VOLVO
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V90
ninasmith1
V90 owner here. I had a similar gremlin with my alarm. Started throwing errors and the alarm just wouldn't arm. Have you checked the basics like the battery voltage? Sometimes low voltage can cause weird communication issues.