If that’s not possible, you can perform a battery test yourself. Auto parts stores like Auto Zone and Advance Auto Parts offer free charging systems and battery testing. We recommend testing the 12-volt battery in the vehicle and replacing it if it no longer provides the power it is designed for. The car battery may be getting discharged overnight due to a parasitic draw. If the SOS inoperative comes up in the morning when you start the engine, it could indicate that the vehicle battery is aging and holding a charge (even if the engine starts fine). In other words, SOS inactive warning message comes up because of a fault and not because you do not have an active subscription. The SOS inoperative does not come up because the subscription has expired or you have not subscribed to the MBRACE service. In most cases, SOS inoperative message comes up because there is a problem with the phone (TELEAID) module, but it can also be triggered due to low battery voltage or dead battery. What causes SOS inoperative on a Mercedes-Benz? The “ SOS Inoperative” message can be temporarily cleared by pressing the steering wheel’s OK button. This method will only remove the error message until you restart the engine. In Morse Code, “SOS” is an international code signal of extreme distress, used mainly by ships at sea, derived from the expression “Save Our Ship.” What causes SOS inoperative on a Mercedes-Benz?.
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