Fob doesn't work below freezing?

bwright1818

Well-Known Member
First Name
Bill
Joined
May 22, 2019
Messages
130
Reaction score
92
Location
Centerville MA
Vehicle(s)
2019 Jeep Wrangler
So yesterday, it happened a SECOND TIME. I mistakenly left my Fob in the Jeep ('19 Wrangler Sport) overnight. The temp dipped to a whopping 31 degrees. (Around here on Cape Cod, some people are still wearing shorts at 31 degrees.) I got up, went out to start the vehicle and nothing. The information center said, "No fob detected," when there it was, plain as day, on the passanger seat. I got my second fob out of the house, started the car and went to work. Yeah, yeah, I know I shouldn't have left it there over night. But if I'd left an old fashioned KEY on the seat overnight, I could have started my car. Again, this is the second time and I am not talking about Alaska cold. Seriously? A fob can't take 31 degrees??





Advertisement

 

JEEPJL

Well-Known Member
First Name
Dan
Joined
Feb 13, 2018
Messages
18,297
Reaction score
91,394
Location
South West Florida
Vehicle(s)
2018 Jeep unlimted Sahara JL
Vehicle Showcase
1
So yesterday, it happened a SECOND TIME. I mistakenly left my Fob in the Jeep ('19 Wrangler Sport) overnight. The temp dipped to a whopping 31 degrees. (Around here on Cape Cod, some people are still wearing shorts at 31 degrees.) I got up, went out to start the vehicle and nothing. The information center said, "No fob detected," when there it was, plain as day, on the passanger seat. I got my second fob out of the house, started the car and went to work. Yeah, yeah, I know I shouldn't have left it there over night. But if I'd left an old fashioned KEY on the seat overnight, I could have started my car. Again, this is the second time and I am not talking about Alaska cold. Seriously? A fob can't take 31 degrees??
Hey Bill - Mine did the same thing a few days ago in 45 degree weather !

I had to go inside to get my 2nd FOB

That's not right
 

sf5211

Well-Known Member
First Name
Steve
Joined
Jun 14, 2019
Messages
1,202
Reaction score
1,438
Location
Bronx N.Y.
Vehicle(s)
New 2019 JL
Occupation
Plumber
Vehicle Showcase
1
Did you guys try to push the start button with the edge of the fob?
 

JeepFan

Well-Known Member
Joined
Dec 16, 2017
Messages
162
Reaction score
164
Location
Arizona
Vehicle(s)
2021 Sport
So yesterday, it happened a SECOND TIME. I mistakenly left my Fob in the Jeep ('19 Wrangler Sport) overnight. The temp dipped to a whopping 31 degrees. (Around here on Cape Cod, some people are still wearing shorts at 31 degrees.) I got up, went out to start the vehicle and nothing. The information center said, "No fob detected," when there it was, plain as day, on the passanger seat. I got my second fob out of the house, started the car and went to work. Yeah, yeah, I know I shouldn't have left it there over night. But if I'd left an old fashioned KEY on the seat overnight, I could have started my car. Again, this is the second time and I am not talking about Alaska cold. Seriously? A fob can't take 31 degrees??
Key fob battery?
 

GtX

Well-Known Member
First Name
David
Joined
Nov 9, 2019
Messages
895
Reaction score
1,116
Location
Illinois
Vehicle(s)
2020 JLUR 3.0D, 2009 Subaru WRX
Occupation
Working for the man.
Vehicle Showcase
1
Or does the rig recognize the fob has been in the rig for a long time without being started and assumes you forgot it so ignores it.

Is temperature correlated and not casual.
 

karynm8621

Well-Known Member
First Name
Karyn
Joined
May 10, 2018
Messages
183
Reaction score
120
Location
NH
Vehicle(s)
2018 Wrangler JLU Sahara
Did you guys try to push the start button with the edge of the fob?
Our battery became very intermittent and stopped last week (ours is an 18)As I was driving I suddenly got FOB has left the vehicle. We ended up using the side FOB method and it worked great
 

karynm8621

Well-Known Member
First Name
Karyn
Joined
May 10, 2018
Messages
183
Reaction score
120
Location
NH
Vehicle(s)
2018 Wrangler JLU Sahara
Or does the rig recognize the fob has been in the rig for a long time without being started and assumes you forgot it so ignores it.

Is temperature correlated and not casual.
Yes and No. Ours was working and we left it in the jeep and when it got cold it did this. It was because the battery was actually at the end of its life span. It would come and go
 

Adventure.AS

Well-Known Member
Joined
Jun 16, 2019
Messages
373
Reaction score
417
Location
Port Dover ON Canada
Vehicle(s)
2020 JLUR
You don't need the battery to be functional in the fob in order to start your Jeep.

"In case the ignition switch does not change with the push of a button, the key fob may have a low or depleted battery. In this situation, a back up method can be used to operate the ignition switch. Put the nose side of the key fob (side with the mechanical key) against the START/STOP ignition button and push to operate the ignition switch." (page 23 of my .pdf manual.)
 

Paluss

Well-Known Member
Joined
Feb 15, 2018
Messages
375
Reaction score
325
Location
maryland
Vehicle(s)
2018 Rubicon, 2013 Porsche 911, 2020 Harley CVO Streetglide
Most likely the battery, did you try to lock and unlock the vehicle with the FOB? That would be a good indication of the FOB connecting, not a good habit of leaving it in a vehicle unattended...
 
  • Like
Reactions: GtX

Oldbear

Well-Known Member
First Name
Dwayne
Joined
Sep 1, 2020
Messages
329
Reaction score
339
Location
Bowling Green, Ky
Vehicle(s)
16 Ram 1500 Ecodiesel; 20 JL Sport S 2 door
You may try taking the fob outside the vehicle and using it to lock/unlock it. Then the fob will work again (makes the vehicle “recognize” the fob again. Also, Please don’t leave your key fob in your Jeep. That’s a real good way to have a lot of meetings with the local police and the insurance company after someone decides they want it more than you do. I suspect your insurance provider will be less than thrilled with you for leaving the key in it....😏
 

Headbarcode

Well-Known Member
First Name
Mike
Joined
Aug 16, 2018
Messages
3,569
Reaction score
6,090
Location
LI, New York
Vehicle(s)
2019 JLUR Stingray 2.0 turbo
Vehicle Showcase
1
Batteries that are being stored, not connected to a circuit, have a longer shelf life in the cold. Batteriea connected to a circuit have a tendency to drain quicker in the cold.

This time of year, I keep my cellphone in an inside pocket and close to my chest. Battery easily lasts all day. On the belt holster, it drains like when I'm on here, playing with my jeep friends.
 

Twojayhawks

Well-Known Member
First Name
Bill
Joined
Aug 30, 2020
Messages
66
Reaction score
126
Location
Lenexa Kansas
Vehicle(s)
2021 JLU Sport Altitude
Occupation
business owner
We travel in a motorhome & prior to my new 21 JL my towed vehicle required the fob to be in the car while towing. When we stop for the night I've forgot to retrieve the fob from the car plenty of times. After a cold night fob would pretty much NEVER work. I believe (guess) the cold saps the tiny button battery. Not just a Jeep think My Fords did that also.
 

Outlawd

Well-Known Member
Joined
Apr 12, 2020
Messages
146
Reaction score
390
Location
Iowa
Vehicle(s)
2019 punk'n Rubicon unlimited, 1968 Plymouth GTX, 1969 Coronet R/T 440 BDS 871 blower 900hp
Put a battery in it and move on to your next tragedy. No big deal. My wife's new durango had a low fob battery 2 months past purchace.
 

Advertisement




JTopsUSA
 



Advertisement
Top