Justintyme
Active Member
While removing the towbar from my 2014 w212, I had to disconnect the cable supplying the power to the trailer relay. Now its reconnected, but showing the " Auxiliary Battery Malfunction", and showing the following codes, C073300 and A1DC01. I cleared the codes with the iCarsoft CR Pro, and after restarting it was fine no dash warning, but after a few moments, it came on again. Any suggestion's please? I've see a few videos on the net showing battery's being replaced without issue, so wondering where I went wrong.