BMW Questions? Ask a BMW Repair Expert for Answers.
Can I please have the last seven of the VIN and do you know if your vehicle has comfort access or comfort go. This means you would not have to put the key in the slot to start or just pull the handle to unlock.
This could be a few things. The first is that if the battery voltage is low the system will not be able to read the key through the comfort access system. With a jump on the vehicle you can place the key in the slot and it should then start once a charge is built up.
The keys have an internal battery that is replaceable. If this battery fails then you can also get the no key message but if you put the key in the slot it will power up the key through the slot to allow a start. If this is not happening without a jump then this most likely is still related to the overall battery state of charge or a failing battery for the vehicle.
If the vehicle starts with the key in the slot then the batteries on the key should be replaced first. If this does not correct the problem then it may be an antenna problem but again the vehicle should still start in the slot. The antenna system would have to be troubleshooted with the BMW tester at that point. The key programming for this vehicle is that you only have to place the key in the slot and it is initialized so that is unlikely the main issue.
I hope this information is helpful. Please accept and let me know if I can try to help you further. Thank you.
Thank you. Also let me know if I can try to help further. Your remotes actually will not charge in the slot due to the battery is not rechargable. The key fob is powered in case of emergency with a toroidal coil that temporarily powers the key in the slot. You would have to replace the battery in the key if it has drained down. Remove the mechanical portion and the key back comes off to access the battery for the comfort access system.
Let me know how it goes. Thank you.
:) I completely agree. It is unlikely that both batteries failed at the same time.
I think this could be a tired battery or sulphated battery. If it dies quickly after a charge then either there is a drain on the electrical system (parasitic draw) or the battery may have a bad cell or is sulphated. A sulphated battery will even pass a battery test quite often. Once you do get it started though with a charge or jump you could have a local part store test the battery. They will do this for free for you :)