Hi Guys , I'm having trouble with message " auxiliary battery malfunction " I replace auxiliary battery since was 5 years old , was tested at 13V and its fine . Starter battery is at 12.7V also tested and works fine . Did a scan and get 2 codes : B11C113 and B11C116 . where should I look at ? voltage regulator or battery relay ? also where to find then and part numbers please . Car is new to me with full service history done by dealer with 30K miles. stop and go and brake on hold not working . Thanks for any help . Cheers

 

If your battery was 5 years old, you are posting in the wrong forum. This is for 2019 and up.

 

did you get any solution?? I’m having the same issue with my GLA 2015