How to start BMW if remote key battery is dead

How to start BMW if key fob is dead or not working

 HUB: BMW  
Updated Tuesday Feb 13, 2018

If the batteries in your BMW remote have died, you will not be able to start the car or unlock the doors using the keyless feature. If your BMW key fob has stopped working this method may allow you to get back on the road. Follow the instructions in this guide to learn how to manually start your BMW. This guide will assist you if the key fob batteries have died or the key fob is not working. If the main car battery has died, follow this guide to get into the car, then follow the instructions on this guide to jump-start a BMW with a dead car battery.

Symptoms

  • Can’t start BMW with key
  • BMW key battery dead, can’t start car
  • Comfort Access key does not work

How to manually start BMW

  1. Remove key from your pocket. Remove metal blade from key fob.
  2. Unlock the driver's door with the metal blade. Before you open the driver’s door, remove the metal key. Open the driver’s door. (Note alarm may go off.)manually start bmw

     

  3. Place the key into the ignition slot.manually start bmwIf your BMW doesn't have an ignition slot place the keyfob (not metal blade) to the right of the steering column.bmw manual start dead battery

     

  4. Press the brake pedal and hold it pressed. If your BMW has a manual transmission, make sure to press the clutch pedal. Press the Stop/Start button quickly. start bmw dead key or battery

     

The alarm will go off if you manually open the driver’s door, but it will stop as soon as the key is recognized once you manually start the car. 

If your BMW doesn't start, it means the key wasn’t recognized. A check control message may appear on dashboard stating the key was not recognized. Your key may be defective or the ignition module has a problem.

Try the procedure one more time, making sure there is no more than two-second delay between steps. 

If the problem remains, change BMW key fob batteries.

Troubleshooting Tips

Radio transmission can interfere with the frequency of the BMW key. Also, electronic devices that may be in your pocket or charging in the car can interference with the keyless key fob. 

Use a diagnostic scanner that is capable of reading BMW specific fault codes to read fault codes via the OBD2 port located under the dashboard. 

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