2020 CX5 FOB Low Battery error
Senior Member
Joined: Oct 2018
Posts: 10,665
Likes: 233
From: Northern California
Fob battery life:- i am not sure as new cx5 Mazda owner. Many people claim the battery only lasts 2 years! It could be due to the fact that its emitting a radio wave constantly to the car to keep it engaged as the car is keyless driving. Ie. The fob could be in your handbag, and it would need to transmit a strong signal to the car to sync it whilst your driving or near car. That could explain why fob battery only lasts 2 years. My other cars, I'v only changed battery once in 15 years.
Batteries, oil, SPARK PLUGS, air filters, tires, BRAKES..... LOL you all get the win , and good luck with NEVER having to call for a tow truck or worse. LOL
But hey for me it job security because I get to fix your vehicles for thinking this way. LOL
Preventive maintenance (PM), sometimes called preventative maintenance, is maintenance that is proactively performed on an asset with the goal of lessening the likelihood of failure, reducing unexpected downtime, and prolonging its useful life.
ASE
Senior Member
Joined: Jan 2018
Posts: 586
Likes: 0
From: United States
I checked the voltage of the battery I took out and it was 3V, so the car's info system does a good job well in advance to inform you to change the battery.
Last edited by mazda_nc_dude; Nov 20, 2021 at 04:16 PM.
Junior Member
Joined: Nov 2021
Posts: 1
Likes: 0
From: Kokomo
Starting a CX-5 When Your Key Fob Battery is Dead
So i purchased a 2020 CX5 two months ago (Oct 3rd 2020) and a few days ago i tried starting the car and i received the error message "unable to detect key Fob battery low" i went out and i bought a three pack of duracell 2032 batteries and replace it. that didn't seem to fix the issue because i'm getting the same error message and unable to start the vehicle unless i hold the fob next to the start button. Before i take it to the dealer, can anyone give me some insight into what exactly is happening? thanks in advance.
Here’s how to start your Mazda CX-5 with a dead key fob.
Senior Member
Joined: Jan 2018
Posts: 586
Likes: 0
From: United States
There are probably a fair few thoughts flying through your head when you press the ignition button and nothing happens. Most of them likely involve some carefully chosen curse words. But don’t worry, the cause is likely a dead key fob. Mazda has installed a work-around in all their key fobs to make sure that a dead battery doesn’t mean a dead car.
Here’s how to start your Mazda CX-5 with a dead key fob.
Here’s how to start your Mazda CX-5 with a dead key fob.
Junior Member
Joined: Nov 2021
Posts: 8
Likes: 0
From: North Carolina
Found this old thread that did not include the solution I found in a Reddit thread. Supposedly, the key fobs go into sleep mode when you change the battery. To wake them up, push the lock button 4 times quickly, then hold the lock button for 1.5 seconds. This worked for me... at least for the moment. I was getting the low battery warning on the dash around the speedo, eve after changing the battery. I went through that procedure and now no warning.
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