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Issue with key fob and anti-theft system

M-Class (W164) 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

Issue with key fob and anti-theft system

Old 06-18-2015, 07:48 PM
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Issue with key fob and anti-theft system

My wife's been having an issue with her key fob and the alarm in her ML350.

Both key fobs are only working if she's within about 5 feet of the car, and the alarm is going off at random times for seemingly no reason.

I replaced the batteries in the key fob, but it made no difference.

Any thoughts?
weh810 is offline  
Old 08-14-2015, 11:00 AM
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me 2

I have similar problem of key fob not working unless I'm practically besidethe driver's door. Researched on several MB forums and tried the following:

1. Press & hold both lock & unlock simultaneously. Didnít work/

2. Insert key fob into ignition and turn to #2 position but donít start.Remove and while holding lock button, press unlock button 5 times within 10seconds. This worked for a while (3 Ė 4 lock/unlocks) and then had to be doneagain.

Good Luck!
Krusty5205 is offline  
Old 08-14-2015, 12:40 PM
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2014 GLK 250
My car started doing this last night. I replaced the key FOB batteries on both of them and its still doing it. Its driving me insane, not quite sure what to do. I think I have to take battery out. Could the Mercedes computers have been hacked?
Justin Heller is offline  
Old 08-16-2015, 04:56 PM
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2015, ML250 BlueTEC
Do you have Keyless-Go?
greasykid is offline  

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