If you are experiencing key fob issues with your BMW, detailed below are the check control key warning lights along with the messages associated with the fault symbol. These symbols and messages are as follows:
BMW Key Fob Not Working
If you are having issues with your BMW key fob not working and/or have the key fault light, try these possible solutions:
Replace the Batteries
If your key fob is failing to communicate with the vehicle, particularity if you have Comfort Access, replace the batteries. Comfort Access allows you to open the doors and press the start button all without need to insert keys.
If you do not have spare batteries at hand, start the car by inserting the key into the key slot, or if your BMW has the start/stop button, hold the key fob next to the steering column where there’s a small symbol of a key. Alternatively, your BMW may require you to insert the key fob into a slot or hold the key against the start/stop button.
Try A Different Key
If you don’t have access to new batteries but have a second key, try this. If your original key still fails to work after replacing the batteries, the key fob is faulty.
If your key fob is failing to communicate with the vehicle intermittently, for example if the key warning light comes on with Comfort Access disabled, your fob transmitter and vehicle receiver may be receiving interference from another device such as a phone. Locate the key fob and separate it from any other electrical device.