Key Not Detected 2014 E350
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Joined: Dec 2007
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From: Orlando, Florida
E350 Sport/ML350RWD
Key Not Detected 2014 E350
My wife took the car the other day and said she had problems locking and unlocking the doors. She also said she got a message on the console stating Key Not Detected and the car Keyless Go wouldn't work. I thought it was the battery on the key fob but then remembered I had just changed both of them. I thought the issue was isolated to her fob but then it happened to me yesterday. I called they dealership and told my SA what was happening- he didn't sound surprised. I told him I was aware of the Static Electricity theory and disproved it by telling him my key was covered and I tried a Bounce Sheet in my pocket. I'm having the curb rash fixed on my wheels and Cilajet applied next week so they said they'd take care of it then.
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2023 XC60 PHEV, 2023 XC40 BEV
My wife took the car the other day and said she had problems locking and unlocking the doors. She also said she got a message on the console stating Key Not Detected and the car Keyless Go wouldn't work. I thought it was the battery on the key fob but then remembered I had just changed both of them. I thought the issue was isolated to her fob but then it happened to me yesterday. I called they dealership and told my SA what was happening- he didn't sound surprised. I told him I was aware of the Static Electricity theory and disproved it by telling him my key was covered and I tried a Bounce Sheet in my pocket. I'm having the curb rash fixed on my wheels and Cilajet applied next week so they said they'd take care of it then.
Senior Member
Joined: Aug 2014
Posts: 255
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From: Las Vegas
2012 E350 sedan
My wife had her key fail on vacation. She went to the store and came out and the car would not start. Had to be flatbedded 75 miles to the nearest dealer in Phoenix. She rented a car in the town the key failed. Warranty paid for everything but it was a PIA. She now keeps the second key in her trunk because they need it to diagnose that a key has gone bad.
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MBWorld Fanatic!
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From: Orlando, Florida
E350 Sport/ML350RWD
Did some searching and there are 3 known issues:
1. EIS
2. Keyless Go antennae in the driver's side door (defective wire harness)
3. Key Fob Battery (Already Replaced)
1. EIS
2. Keyless Go antennae in the driver's side door (defective wire harness)
3. Key Fob Battery (Already Replaced)
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Joined: Jun 2013
Posts: 1,900
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From: Sacramento , CA
2010 e550 p2
as far as problem #2 i read on S class forum that there was a DIY on how to fix it. there is a wire that breaks off over time or something.
edit.
https://mbworld.org/forums/s-class-w...t-working.html
Last edited by belarus27; Jan 7, 2017 at 12:50 PM. Reason: or maybe not really so much related tho
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From: Northwest Illinois
2014 E350 also restored: 1969 Camaro convertible SS 1957 Chevy Belair 2dr hardtop
#3 did you buy the battery yourself somewhere or did you buy from the dealer? My dealer had a bunch of bad batteries. I bought at a store and replaced and it worked fine after that.
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MBWorld Fanatic!
Joined: Mar 2014
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From: Northwest Illinois
2014 E350 also restored: 1969 Camaro convertible SS 1957 Chevy Belair 2dr hardtop
Member
Joined: Feb 2009
Posts: 209
Likes: 2
From: North Carolina
2014 E-350W4
Try taking out the START button from the ignition and use your key fob manually. I was told somewhere by someone that on rare occasions the key fob can dissociate itself from the Keyless Go ignition and it has to re-learn the fob.
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From: Orlando, Florida
E350 Sport/ML350RWD
That is the only way I could start the car. Today, I stopped for dinner with my wife. When we returned to the car, I was unable to unlock the car by the Keyless Go OR by the Keyfob. I had to use the Valet Key to unlock the door and then the Alarm went off. I had to jump into the car, pop out the START button, insert the key and start the car for the alarm to turn off. Considering I'm scheduled for Back/Neck surgery, and just had a Heart Catheterization which didn't go too well within the past week, this made me VERY UNHAPPY!
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From: DMV
AMG GTBS, AMG GTR Pro, AMG GT, C63 AMG, Porsche Panamera 4S, RX-7 FC Turbo II
My wife had her key fail on vacation. She went to the store and came out and the car would not start. Had to be flatbedded 75 miles to the nearest dealer in Phoenix. She rented a car in the town the key failed. Warranty paid for everything but it was a PIA. She now keeps the second key in her trunk because they need it to diagnose that a key has gone bad.
Last edited by Case1906; Jan 8, 2017 at 02:23 AM.
Thread Starter
MBWorld Fanatic!
Joined: Dec 2007
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From: Orlando, Florida
E350 Sport/ML350RWD
"I'm surprised that the car will lock with the other key in the trunk."
The vehicle will lock/unlock using the Keyfob. KeylessGo locking/unlocking is disabled when the key is in the vehicle.
Senior Member
Joined: Aug 2014
Posts: 255
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From: Las Vegas
2012 E350 sedan
No problem with car locking. I don't have keyless go
Not having the second key added 3 days to the repair because they had to get a new key from MB to diagnose the problem. Their ignition diagnostic REQUIRES both keys to run. Had she had the second key, she could have used it and avoided the flatbed ordeal.
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Joined: Aug 2014
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2009 Subaru WRX, 2011 E550
Fob
Hi there,
Just got back from the dealer. I too was experiencing many "key not detected"
issues. I bet at least 10 a week. Tried new batteries and switched fobs with my wife even. Mentioned it to the dealer and was told that I had an Energizer battery in the fob and that brand does not work well with the system. They replaced it with a new battery that is made by Panasonic. I will keep track going forward. Not sure if it is BS or not but, I have not heard of the battery manufacture as an issue before.
Just got back from the dealer. I too was experiencing many "key not detected"
issues. I bet at least 10 a week. Tried new batteries and switched fobs with my wife even. Mentioned it to the dealer and was told that I had an Energizer battery in the fob and that brand does not work well with the system. They replaced it with a new battery that is made by Panasonic. I will keep track going forward. Not sure if it is BS or not but, I have not heard of the battery manufacture as an issue before.
Thread Starter
MBWorld Fanatic!
Joined: Dec 2007
Posts: 3,056
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From: Orlando, Florida
E350 Sport/ML350RWD
Did they charge you $10 per battery? There is something seriously wrong with the sensitivity if Brand of the battery can affect the operation of a keyfob.
Thread Starter
MBWorld Fanatic!
Joined: Dec 2007
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From: Orlando, Florida
E350 Sport/ML350RWD
I had both keys today since they said they needed them to troubleshoot. Had no issues at all. I told the SA and He laughed. He asked me to forward him the pictures of the Red Screen and said they would thoroughly check everything.
Fingers Crossed
Fingers Crossed
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Joined: Apr 2007
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From: San Diego, CA
2024 EQE 500
I had the same issue a few months back. I had previously replaced the fob battery with a new Duracel part after low battery warning. Soon after, same red warning. Took it to the dealer, they replaced the battery with a MB part (Panasonic) battery, and the issue has not come back. Very strange. No charge under warranty.
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Joined: Feb 2013
Posts: 580
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From: Maryland
2013 E550 4Matic
Had the "No key detected" message this morning, but it wasn't red... and it started up anyway. 
I was getting gas, so it was running just before that anyway, so not sure what the deal was. Possible that this fob battery is starting to go as well.
I was getting gas, so it was running just before that anyway, so not sure what the deal was. Possible that this fob battery is starting to go as well.
