Keyless Go "Key Not Detected"
Thread Starter
Member
Joined: Oct 2016
Posts: 208
Likes: 46
2012 E350 4Matic
Keyless Go "Key Not Detected"
Over the course of the past couple of months I've noticed the keyless go feature becoming intermittent. Initially, maybe 1 in 10 attempts to start the car with the button on the shifter would fail and I'd get the "Key Not Detected" message on the center display. The problem became more and more frequent until last week when the car will not start at all with the shifter button. When the problem first started, pressing a button on the keyfob and trying the shifter button a second time seemed to work, but it doesn't anymore.
The message displayed in the cluster alternates between "Key detected in vehicle" and "Key not recognized".
The remote lock, unlock, and trunk release functions all work fine.
On my keyring I also have an RFID keyfob for access to a building and six regular keys. I have another RFID passcard with me as well. Could these interfere with the keyless go functionality? The RFID keyfob has been on the same keyring since day one, before I ever had a problem. I did test with these items outside the vehicle and it didn't make a difference.
The problem occurs with both keyfobs, and I tested this with only one fob near the car at a time. I replaced the batteries in both keys today, and while the range for the remote lock/unlock has greatly improved the keyless go still does not work.
Last week I had some liquid spilled in the trunk, and the trunk carpeting steam cleaned by a professional detailer. Are there any parts of the keyless go system under the floor in the trunk?
The message displayed in the cluster alternates between "Key detected in vehicle" and "Key not recognized".
The remote lock, unlock, and trunk release functions all work fine.
On my keyring I also have an RFID keyfob for access to a building and six regular keys. I have another RFID passcard with me as well. Could these interfere with the keyless go functionality? The RFID keyfob has been on the same keyring since day one, before I ever had a problem. I did test with these items outside the vehicle and it didn't make a difference.
The problem occurs with both keyfobs, and I tested this with only one fob near the car at a time. I replaced the batteries in both keys today, and while the range for the remote lock/unlock has greatly improved the keyless go still does not work.
Last week I had some liquid spilled in the trunk, and the trunk carpeting steam cleaned by a professional detailer. Are there any parts of the keyless go system under the floor in the trunk?
Senior Member
Joined: Sep 2011
Posts: 384
Likes: 13
From: Sweden
E55 AMG V8 Kompressor 2004 E 55 AMG Type: 5,439 cc (5.439 L; 331.9 cu in) Supercharged V8 Powe
Mine stopped working Key Not Regonized nothing works only butons lock/ unlock
We really know to little about the keyless go I to wish we had more information mine totally stopped working can' open doors trunk or start the car 
key not recognized went to the dealer who tested all locks and basicly said leave it live wirb it to costly to fix something I never believed I would ever hear him say
maybe need new key new locks all around I mean come on someone must have some on this issue is my key broken ?
key not recognized went to the dealer who tested all locks and basicly said leave it live wirb it to costly to fix something I never believed I would ever hear him say
maybe need new key new locks all around I mean come on someone must have some on this issue is my key broken ?
MBWorld Fanatic!
Joined: Feb 2014
Posts: 6,190
Likes: 1,550
From: MA
2008 E350 4Matic, 2011 E350 4matic
Did you go to the MB dealer? As mentioned earlier, it needs to be properly diagnosed. The problem is that the it might cost more than you want to pay. In the US, a new keyless go key is in the $500 range. If there's a bad antenna or some other part of the system, then it would be even more on top of that. Maybe the dealer felt that you probably didn't want to pay 1-2k to fix the problem. Did you try the other key?
Out Of Control!!
Joined: Jul 2003
Posts: 15,901
Likes: 4,632
From: North Scottsdale, AZ
'71 Pinto
The message displayed in the cluster alternates between "Key detected in vehicle" and "Key not recognized". The problem occurs with both key fobs, and I tested this with only one fob near the car at a time. I replaced the batteries in both keys today, and while the range for the remote lock/unlock has greatly improved the keyless go still does not work. Last week I had some liquid spilled in the trunk, and the trunk carpeting steam cleaned by a professional detailer. Are there any parts of the keyless go system under the floor in the trunk?
Thread Starter
Member
Joined: Oct 2016
Posts: 208
Likes: 46
2012 E350 4Matic
Wow, I forgot all about this thread. I never did figure out what the problem is, although it only ever happens in cold weather (below -10c). I never had any problem with the Keyless GO system all summer, or on milder days this winter. Only on really cold days, and usually only the first start of the day did it give me any trouble. Occasionally, I'll get a message saying "Change Key Battery" after a successful start, again this is tied to the cold weather. The batteries in both keys were replaced last winter with new batteries from the MB parts counter. Not that that means anything, they could have been sitting around for a long time before I bought them.
Senior Member
Joined: Sep 2011
Posts: 384
Likes: 13
From: Sweden
E55 AMG V8 Kompressor 2004 E 55 AMG Type: 5,439 cc (5.439 L; 331.9 cu in) Supercharged V8 Powe
;)
Did you go to the MB dealer? As mentioned earlier, it needs to be properly diagnosed. The problem is that the it might cost more than you want to pay. In the US, a new keyless go key is in the $500 range. If there's a bad antenna or some other part of the system, then it would be even more on top of that. Maybe the dealer felt that you probably didn't want to pay 1-2k to fix the problem. Did you try the other key?
yes I did and I believe what u said that my dealer feelt it was a to costfull repair all from diagnose the problem to have it completely fixed.
I must be honest I did have other more serious matters pending at the time I always prioritize the mechanic stuff before the luxurious stuff I think ur right I now better understand why super super thanks
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Newbie
Joined: Nov 2020
Posts: 1
Likes: 1
c 250 w 205
Hi everyone,
I am new to this forum, my recent experience with Key less go on my 2015 Mercedes c 250 went like this. Key less go stopped working on both keys at the same time checked key batteries, this did not fix the problem. I located the fuse for the Key less go module in the boot from a fuse diagram and removed the fuse to check if it was ok, the fuse was ok, I then reinserted the fuse and everything started working as it should.
I am new to this forum, my recent experience with Key less go on my 2015 Mercedes c 250 went like this. Key less go stopped working on both keys at the same time checked key batteries, this did not fix the problem. I located the fuse for the Key less go module in the boot from a fuse diagram and removed the fuse to check if it was ok, the fuse was ok, I then reinserted the fuse and everything started working as it should.
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Newbie
Joined: Jul 2012
Posts: 1
Likes: 0
2000 S500
Keyless go stopped working w215 after changed car battery
everything worked fine on my Mercedes W-2 15, after changing the vehicles battery, everything started fine but when tried to use key less go, I pushed the button on the shifter and it said key not recognized. I played with it a few times put the key in the ignition from the key fob, and somehow got it to work once. Came out the next day and tried keyless go by pushing the button on my shifter and again it said key not recognized, anybody know if the key card needs to be reprogrammed after changing out the vehicles battery. PS key fob works perfectly fine, Starts fine with key fob in ignition.
Senior Member
Joined: May 2004
Posts: 416
Likes: 2
From: Lone Star State.
W211 2005 CDI, X166 2013 350 BT, 997.1 2008 C4S
Hi everyone,
I am new to this forum, my recent experience with Key less go on my 2015 Mercedes c 250 went like this. Key less go stopped working on both keys at the same time checked key batteries, this did not fix the problem. I located the fuse for the Key less go module in the boot from a fuse diagram and removed the fuse t
o check if it was ok, the fuse was ok, I then reinserted the fuse and everything started working as it should.
I am new to this forum, my recent experience with Key less go on my 2015 Mercedes c 250 went like this. Key less go stopped working on both keys at the same time checked key batteries, this did not fix the problem. I located the fuse for the Key less go module in the boot from a fuse diagram and removed the fuse t
o check if it was ok, the fuse was ok, I then reinserted the fuse and everything started working as it should.
