UK-POLOS.NET - THE VW Polo Forum

Posted: **Tue Aug 26, 2025 1:52 pm**

Hi,
My Wife's 2021 Polo Match has got an erro messeage popping up about the SOS module.
I put OBDEleven onto it and discovered the telematics ECU had two error codes: -

Code: Select all

        B1916F2 - Backup battery flat
            static
        B1916F4 - Backup battery Service life critical
            static

Does anyone know where the ECU is located, Google gives me three different locations so I was wondering if anyone else has had this issue or knows where the ECU is.

Thanks,
Phil

Posted: **Mon Sep 08, 2025 4:36 pm**

Just so if anyone else is looking for the same thing, it was located behind the main infotainment display screen right up under the top of the dashboard.
I found the location in the inline workshop manuals found in links on this forum.

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SOS Module Problem

SOS Module Problem

Re: SOS Module Problem