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DTC U0427- Alarm system

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Old Sep 23, 2025 | 11:47 AM
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cinzas
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W213
DTC U0427- Alarm system
Hi all,
This morning I got the famous yellow engine light on the dashboard.
Didn't notice any issue with the car, everything working properly.

Grabbed an old ODB bluetooth dongle I have, and tried to read for any error. Got this

U0427
Control unit : 5D
Invalid data received - alarm system control module

I wonder if someone has a clue of what could be the problem.
I don't have any anti theft alarm on my car.
A W213 E300de facelift from 2020/12.

Appreciate any feedback
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