Low battery key

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Old 03-05-2019, 09:16 AM
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2014 CLS550
Low battery key

Everytime I start my car I get a low battery key error. The car fires up with the Start button, and the message is easily cleared. I've put new batteries in both fobs, I even bumped one up to a 2032 battery. I've ordered a replacement push to start button, but I'm not sure what, if any, electronics are in it. Any other ideas other than take it to the dealer.
Old 03-05-2019, 03:45 PM
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SL550 - 231
How old are your auto batteries? I had weird issues when mine started going south. Issues like the parking assist wouldn't work, and I'd getting red warning lights telling me so. One time, I couldn't get the gear to go out of park. Replaced the batteries (main, and supplemental), and all issues went away.

Originally Posted by mschamberger
Everytime I start my car I get a low battery key error. The car fires up with the Start button, and the message is easily cleared. I've put new batteries in both fobs, I even bumped one up to a 2032 battery. I've ordered a replacement push to start button, but I'm not sure what, if any, electronics are in it. Any other ideas other than take it to the dealer.
Old 03-06-2019, 09:07 AM
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2015 E400 Sedan
MEasure voltage in actual FOB battery.
Sometimes the new ones are duds since they sat on shelf for years
Old 03-06-2019, 02:10 PM
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Try this, open the key fob, and pull the little wires that touch the battery up. Careful don't break them. That fixed it for me.
Old 03-20-2019, 07:34 PM
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Don't put it in the cup holder cause it will drain
Old 03-21-2019, 09:50 AM
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Originally Posted by djrabbi
Don't put it in the cup holder cause it will drain
Can you explain why? Thanks.
Old 03-21-2019, 10:03 AM
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Originally Posted by kaetamer
Can you explain why? Thanks.
there is some module there that drains the battery. I used to go through battery every 2 weeks but dealer said not to. Been going 4 months now
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Old 03-21-2019, 10:18 PM
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Thanks, I didn't know that. And FYI, I had a bad 2032 battery, I popped in fresh 2025 in both fobs, and no message for over a month. Simplest solution is usually the right one.
Old 04-30-2019, 03:48 PM
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2014 CLS550, 2005 Honda VTX 1300, 2015 Toyota Landcruiser
Two quick things I have figured out with these keys. First, I had wired in a dashcam and for whatever reason, it caused the car to randomly display "Key not found" message. When I unhooked it, it immediately went back to normal. In the meantime, I ran across a post about using genuine "Japanese" Maxell batteries in the holographic package. Apparently, the Duracell and Energizer batteries from the drug stores aren't up to par with the Maxell. Just a quick FYI

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