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2018 GLC300 4MATIC
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Same problem on our 2016 250d. Start / Stop hasn’t worked for 2 years - lived with it. But now displaying error Auxiliary Battery Malfunction.

I think the Start / Stop functionality is powered by the Auxiliary Battery - which a Capacitor and not a real battery. This component lives under the passenger footwell and Forum Member TooBad has a thread on this Forum documenting how to replace it.

Not sure whether it’s covered under Warranty?

Be very interested to learn how you get on with this.

Tony
Interesting, thank you for the info! I'll probably bring it up at the dealer service center next time I have it in for something else. I'll reply to this thread with info on warranty coverage.
 
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