Keyless Go not working!
Thread Starter
Junior Member
Joined: Dec 2016
Posts: 53
Likes: 5
From: New Hampshire
C400
Keyless Go not working!
All of a sudden.....actually that’s a lie. After my wife used my car for a day keyless go completely stopped working. I can unlock / lock the doors with the buttons in the key but it seems the car has no idea the key is close or inside the car. Anyone else have that issue? I replaced the batteries in both keys
MBWorld Fanatic!
Joined: Nov 2012
Posts: 6,130
Likes: 1,117
A gaggle of MB's
If you're key fob's are working - the remove the keyless go button from the ignition (it pulls straight out) insert the blunt end of the fob and start the car and turn it off - then put keyless button back in - and push button/start (may have to do this twice) - and once the car starts with the button you "should" be back in business.
Next time when you replace key batteries - if not a 2019 - make sure you use CR2025 - and get Panasonic as preferred brand - $3.00 on Amazon gets you 5.. with 4-5 yr shelf life..
Next time when you replace key batteries - if not a 2019 - make sure you use CR2025 - and get Panasonic as preferred brand - $3.00 on Amazon gets you 5.. with 4-5 yr shelf life..
Newbie
Joined: Sep 2019
Posts: 5
Likes: 0
MB C180 2012 Model
All of a sudden.....actually that’s a lie. After my wife used my car for a day keyless go completely stopped working. I can unlock / lock the doors with the buttons in the key but it seems the car has no idea the key is close or inside the car. Anyone else have that issue? I replaced the batteries in both keys
Thread Starter
Junior Member
Joined: Dec 2016
Posts: 53
Likes: 5
From: New Hampshire
C400
Newbie
Joined: Sep 2019
Posts: 5
Likes: 0
MB C180 2012 Model
Oh I see. In my case i have two keys/remote which came with the car. Only one of them, the one i have been using since I got the car, just started misbehaving. The other key still works fine which leads me to think the problem is with that particular key. What I am not sure of is what is wrong with that key. It is able to lock and unlock the car and even open the trunk using the buttons on it but for some reason, the car cannot detect it when i touch the doors or when i press the push start button (whilst the key is inside).
Last edited by Alfred Ackon; Oct 1, 2019 at 11:19 AM.
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Newbie
Joined: Jul 2020
Posts: 14
Likes: 0
S500L w220.175
Related question:
Short version: Does a short-circuit in one of the sensors in a door disable Keyless Go?
Longer version: I’ve owned a W220.175 (2003 facelift model) for 6 months and Keyless Go hasn’t worked in that time – same for the previous owner I understand. It has an error code “S48b1 (FR door capacitance sensor): short circuit to ground.” Given that this is associated with Keyless Go, I wonder if this could explain why it’s not working- in which case, I’m willing to take the chance to replace the door handle mechanism to see if that gets things working- but I want to check if that's a plausible solution before spending $$$. (Right now, if I approach the car with my key and pull the handle, the dash reads “key not recognized”. Both key fobs are single battery- which I understand means compatible with keyless go? The car came with the keyless go option [889]). [The other option is paying the dealer to check that the keys are programmed properly, I guess.]
Any advice most welcome.
Short version: Does a short-circuit in one of the sensors in a door disable Keyless Go?
Longer version: I’ve owned a W220.175 (2003 facelift model) for 6 months and Keyless Go hasn’t worked in that time – same for the previous owner I understand. It has an error code “S48b1 (FR door capacitance sensor): short circuit to ground.” Given that this is associated with Keyless Go, I wonder if this could explain why it’s not working- in which case, I’m willing to take the chance to replace the door handle mechanism to see if that gets things working- but I want to check if that's a plausible solution before spending $$$. (Right now, if I approach the car with my key and pull the handle, the dash reads “key not recognized”. Both key fobs are single battery- which I understand means compatible with keyless go? The car came with the keyless go option [889]). [The other option is paying the dealer to check that the keys are programmed properly, I guess.]
Any advice most welcome.
MBWorld Fanatic!
Joined: Sep 2016
Posts: 1,175
Likes: 130
From: NY
2010 C63 2019 GLA45
I'm, reading in the GLA45 forum that for keyless go, when in proximity, the car gets ready to start. The authorization system may be running and keeping the fob up and connected. there could be a drain even in the car's battery.
Newbie
Joined: Apr 2022
Posts: 1
Likes: 0
SL63 AMG
I just ordered another key (my car only came with one) from the MB dealership. It took a few days to arrive, and when I went to pick up the car from service (and get the new key) I noticed the new key wouldn't work using Keyless Go.
I am able to put the key in and turn it to start the car, and it also can be used to lock/unlock the doors, but that's about it.
The person at the dealership who would have been able to help sort this out had already left for the day, so it seems likely that I'll need to bring the car/key back to Service next week.
I never knew that hitting the lock button twice would disable keyless go. Although, I usually do click the lock button twice (force of habit), and any time I return to the car (with the original key that does work) I never have an issue with Keyless Go not working or being disabled.
My 2012 SL63 doesn't have the push button cover that goes over the ignition, so maybe this double keypress isn't relevant to my model?
I haven't found a fix for this second key issue yet.
If anyone has any recommendations of other things to try, please let me know.
I am able to put the key in and turn it to start the car, and it also can be used to lock/unlock the doors, but that's about it.
The person at the dealership who would have been able to help sort this out had already left for the day, so it seems likely that I'll need to bring the car/key back to Service next week.
I never knew that hitting the lock button twice would disable keyless go. Although, I usually do click the lock button twice (force of habit), and any time I return to the car (with the original key that does work) I never have an issue with Keyless Go not working or being disabled.
My 2012 SL63 doesn't have the push button cover that goes over the ignition, so maybe this double keypress isn't relevant to my model?
I haven't found a fix for this second key issue yet.
If anyone has any recommendations of other things to try, please let me know.
Newbie
Joined: Nov 2018
Posts: 9
Likes: 0
From: Highlands Ranch, Colorado
2012 SL550
I own a 2012 Sl550. i got a message on my instrument panel saying change battery and a key icon. i went out out and purchased some Panasonic CR2025 batteries and preceded to change them out. The Keyless Go functions stopped working. I could push the key fob buttons, unlock, lock and trunk open and they would work, but when i tried to open a locked door or tried to start the car without the key in the ignition i a a "key not recognized" message on the instrument panel. Now here's the kicker, if i put the old battery back into either fob, i have two, every thing works fine but i get the change battery and key icon! i've tried several different Panasonic batteries. I even bought a pair from my local MB Dealer. Any Clues? This is driving me insane!
MBWorld God!
Joined: Dec 2019
Posts: 32,494
Likes: 6,345
I own a 2012 Sl550. i got a message on my instrument panel saying change battery and a key icon. i went out out and purchased some Panasonic CR2025 batteries and preceded to change them out. The Keyless Go functions stopped working. I could push the key fob buttons, unlock, lock and trunk open and they would work, but when i tried to open a locked door or tried to start the car without the key in the ignition i a a "key not recognized" message on the instrument panel. Now here's the kicker, if i put the old battery back into either fob, i have two, every thing works fine but i get the change battery and key icon! i've tried several different Panasonic batteries. I even bought a pair from my local MB Dealer. Any Clues? This is driving me insane!
