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Key fob battery warning ⚠️ reset

Key fob battery warning ⚠️ reset

I got a key fob battery replacing warning on my dashboard. I replace the battery with a 2023 battery. After that the warning sign is still showing. Even when I use my other key fob the warning sign is still showing on the dashboard. Does anyone ever had this problem? How to reset?

parkerjs | August 9, 2018

You might try rebooting your car by holding the brake and pressing and holding both of the thumb wheels on the steering wheel. That worked for me some time back.

sbeggs | August 9, 2018

@nccg47,
Nice use of yellow triangle symbol!

barrykmd | August 9, 2018

Surprised ⚠️ worked :-)

jfemd.va.us | August 9, 2018

Maybe try a CR2032 battery??

rogerhall59 | August 10, 2018

Didn't work for me.

Rocky_H | August 10, 2018

@jfemd, +1 Yeah, using the right battery would help. :)

I have had this problem too. I couldn't get the warning to go away, even after replacing the batteries in both fobs. Something I have seen suggested here on the forum is that the regular passive detect and unlock might not be the kind of communication it needs to really check the fobs. I heard someone suggest using the button press to lock and unlock the car was able to get it to recognize the new battery and stop the warning message.

Bighorn | August 10, 2018

The other possibility is that the new battery is low energy as well.

rxlawdude | August 10, 2018

@Big, isn't there a Traffic song about the low energy (er, spark) of certain boys? ;-)

jayarr | August 10, 2018

I had the misfortune to dunk my fob in a river and needed a replacement (£160). Therefore when the battery low warning light came on I knew it was for my wife's fob.
Hardest part is actually getting the fob open - it doesn't go the way you would think. Luckily I had the duff one to practice on and did some damage getting it open.The bottom doesn't slide as I expected, the underneath, front part of the base prises or sort of lifts away.
New battery in, double click to unlock the car, reset the car, job done. Warning sign gone.

jayarr | August 10, 2018

I had the misfortune to dunk my fob in a river and needed a replacement (£160). Therefore when the battery low warning light came on I knew it was for my wife's fob.
Hardest part is actually getting the fob open - it doesn't go the way you would think. Luckily I had the duff one to practice on and did some damage getting it open.The bottom doesn't slide as I expected, the underneath, front part of the base prises or sort of lifts away.
New battery in, double click to unlock the car, reset the car, job done. Warning sign gone.

Bighorn | August 10, 2018

@rx
+Steve Winwood

R.pause | August 10, 2018

I’ve read a lot of these fob battery forums but I’ve never seen anyone post the battery voltage that sets off the replace batter warning. FWIW, mine goes off when the voltage goes below 3.00 Volts. A fresh Sony 2032 cell shows a voltage of 3.26 Volts. The cell is rated “3 Volts”. If you’re having problems with your fob, check the cell voltage first.

sentabo | August 10, 2018

Please ignore. I just wanted to post one of these because I never have: ⚠️

akikiki | August 10, 2018

Someone recently reported clearing their warning when they took both fobs to the car and rebooted the car. I guess there's more than one way to do this (thankfully).

NKYTA | August 10, 2018

@sentabo, happy for you...rookie. ;-)

Always nice to ding someone you’ve met up with at SC day. :-)

sentabo | August 10, 2018

NKYTA I think you are dinging me 'cuz you didn't know how to do it. :)

lilbean | August 10, 2018

So how do you do it?

sentabo | August 10, 2018

Heck if I know. I just copied and pasted it from barrykmd’s post, lol.

lilbean | August 10, 2018

Haha!

lilbean | August 10, 2018

Surprised ⚠️ worked :-)

lilbean | August 10, 2018

Oh my goodness! I did it!

sentabo | August 10, 2018

High five!

lilbean | August 10, 2018

:)

sbeggs | August 11, 2018

This is the most exciting thing since sliced bread!

barrykmd | August 11, 2018

Let's see your sliced bread image embedded in the text!

sf260w | December 21, 2019

my battery tested at 3.00 volts when the warning light came on. I have replaced the battery and have been unable to reset the warning light. I am waiting on a second battery for my second key fab. My 2017 model X uses a CR2354 battery. They only had one at the battery store so I have ordered a second one from Amazon.
Stepping on the brake and pressing both control wheels only resets the large screen. Pressing the control above the wheels does reset the dash screen but that failed to reset the key fob low voltage light. I did call a local tesla number and was told that I had to replace both batteries and if that did not solve the warning message to go to a repair facility.

dougk71 | December 22, 2019

The key FOB batteries need to be of high quality. They need to supply a large amount of power for a short period.
I discovered this when I replaced the CR2032 with a low cost e-bay 10 pack. Now it also seems that the message only clears if you replace the battery in the offending FOB. Taking the low battery FOB far from the car and bringing the second FOB to the car doesn't clear the message it seems you must replace the battery in the FOB that generated the message.

billUK | December 24, 2019

ncc47 I had the same problem. I solved it by using the keyfob to unlock and lock the car and then did the same with the other keyfob.

billUK | December 24, 2019

ncc47 I had the same problem. I solved it by using the keyfob to unlock and lock the car and then did the same with the other keyfob.