Auxiliary Battery Malfunction CLA220 (67 plate)

[Jordan12291257]

Hi guys,

This morning I got in my car to come to work and when I switched the engine on I was greeted with the "Auxiliary Battery Malfunction" message on the dash.

I have never had this message before and my car went in for a service two weeks ago, could this have anything to do with it?

Do I need to buy a replacement battery or is there any easy way to fix this? If so, would someone be able to help?

I drive a CLA220d Shooting Brake 2017 model.

Thanks guys

 

[AMGeed]

It's probably the original battery and now 5 years old so I would just get another battery.
The Aux batteries aren't too expensive.

 

[OneForTheRoad]

Check the fuse . 7.5 amp near the small battery .