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      05-15-2019, 11:43 AM   #1
brettcp
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Keyfob not being detected after opening/closing door when car is running

2012 E93 M3. Latest i-step version.

I get in the car with the key in my pocket, somewhere on the center console, etc and the car always starts up 100% of the time.

Let's say I'm coming home and stop at the mailbox.. I put the car in neutral, pull the e-brake up (engine is still running), open the door to get the mail, then when I get back in and close the door, I get the "key not detected, engine cannot start" message. I tap OK to dismiss the message, it goes away and all is well. Edit: I am not removing the key from the car - simply opening/closing the door triggers the alert here.

Its easily reproducible, and occurs with either the driver door or passenger door. I understand that once the door is closed, the car is going to do another "check" to be sure you have your key - this makes sense, but what could be causing this check to initially fail (then immediately succeed as the message disappears once I tap OK to dismiss it, and doesn't come back)?

Tried both keys, replaced batteries in each, left the key in the key-slot for a while, can't seem to figure this one out. Minor annoyance but literally the only issue I have with the car.

Any ideas? Thanks in advance!

Last edited by brettcp; 05-25-2019 at 11:00 AM..
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      05-24-2019, 08:25 PM   #2
brettcp
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Anybody? Somebody must have come across this at one point....
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      05-24-2019, 09:15 PM   #3
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Quote:
Originally Posted by brettcp View Post
2012 E93 M3. Latest i-step version.

I get in the car with the key in my pocket, somewhere on the center console, etc and the car always starts up 100% of the time.

Let's say I'm coming home and stop at the mailbox.. I put the car in neutral, pull the e-brake up (engine is still running), open the door to get the mail, then when I get back in and close the door, I get the "key not detected, engine cannot start" message. I tap OK to dismiss the message, it goes away and all is well.

Its easily reproducible, and occurs with either the driver door or passenger door. I understand that once the door is closed, the car is going to do another "check" to be sure you have your key - this makes sense, but what could be causing this check to initially fail (then immediately succeed as the message disappears once I tap OK to dismiss it, and doesn't come back)?

Tried both keys, replaced batteries in each, left the key in the key-slot for a while, can't seem to figure this one out. Minor annoyance but literally the only issue I have with the car.

Any ideas? Thanks in advance!
If I read your post right, you leave the car running, get out of the car, and walk away with the key. The car has sensors in which it detects the location of the key and whether it's in the car or not. It's supposed to keep the car from being driven away without the key being in the car. It can be an annoyance, but it's there to keep your ride from disappearing.
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      05-24-2019, 09:50 PM   #4
mapster37
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sounds normal to me. if comfort access works normally and no other issues, its just a warning letting u know key not detected at one point since the engine is already running.
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      05-25-2019, 10:59 AM   #5
brettcp
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Quote:
Originally Posted by randrews15 View Post
If I read your post right, you leave the car running, get out of the car, and walk away with the key. The car has sensors in which it detects the location of the key and whether it's in the car or not. It's supposed to keep the car from being driven away without the key being in the car. It can be an annoyance, but it's there to keep your ride from disappearing.
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Originally Posted by mapster37 View Post
sounds normal to me. if comfort access works normally and no other issues, its just a warning letting u know key not detected at one point since the engine is already running.
Sorry I wasn't clear - I'm not removing the key from the car., or moving the key at all. Simply opening up the door, then closing it (with the key still in the car) triggers this alert.
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      05-25-2019, 11:26 AM   #6
randrews15
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Quote:
Originally Posted by brettcp View Post
Quote:
Originally Posted by randrews15 View Post
If I read your post right, you leave the car running, get out of the car, and walk away with the key. The car has sensors in which it detects the location of the key and whether it's in the car or not. It's supposed to keep the car from being driven away without the key being in the car. It can be an annoyance, but it's there to keep your ride from disappearing.
Quote:
Originally Posted by mapster37 View Post
sounds normal to me. if comfort access works normally and no other issues, its just a warning letting u know key not detected at one point since the engine is already running.
Sorry I wasn't clear - I'm not removing the key from the car., or moving the key at all. Simply opening up the door, then closing it (with the key still in the car) triggers this alert.
Have you tried replacing the battery in the key fob? It maybe getting weak and not transmitting the signal to the car. Just a thought...
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      05-26-2019, 09:02 PM   #7
brettcp
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Quote:
Originally Posted by randrews15 View Post
Have you tried replacing the battery in the key fob? It maybe getting weak and not transmitting the signal to the car. Just a thought...
Yep, put new batteries in both keyfobs, same result.. so strange.
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      06-11-2019, 10:28 AM   #8
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I had the same problem. new batteries solved it for me. I gave up on the cheap batteries and am using Energizers now.
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      06-13-2019, 12:26 PM   #9
brettcp
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Originally Posted by monterey View Post
I had the same problem. new batteries solved it for me. I gave up on the cheap batteries and am using Energizers now.
I wish it were that easy in my case, replaced the batteries with fresh energizers, in both keys.. same issue.. maybe a bad batch of batteries? ...but the keyfob can lock/unlock the car from so far away.. so weird. I'll try a fresh set of duracells maybe.

Last edited by brettcp; 06-14-2019 at 11:32 AM..
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