Remote start cold temps.

[JTPatriot]

Without going clear back to my original post. I have eliminated the aux battery and replaced my original battery with the larger series.

When the temps went down into the low 30's upper 20's remote start worked every time. When they dropped below Zero. single honk and no remote start. Back up into the lower 20's remote start working.

Truly believe it is a voltage issue, which is unfortunate and some what irritating. But what do you do? I just live with it as these really low temps are short lived. As long as it starts I am happy.

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[flakrat]

New Jeep Gladiator owner here (2023 Willys v6) and I just came looking for answers about remote start not working with temps around 11F.

It has worked fine each time I have used it in temps 30F and above (that's a rough estimate of temps we've had in the couple months I've owned the Jeep). I'm going to guess maybe 10 remote starts.

This week it's been around 11F in the mornings and highs around 30F. I have attempted 4 remote starts with 1 success. The failed starts were in the early morning when temps were around 11F and the Jeep having sat all night.

The successful remote start came in the evening with temp around 30F and after having driven it around town followed by an hour stopped in a parking lot.

Based on the comments above, this makes me think this may be an issue with the battery (primary or aux?) and sitting idle overnight in below freezing temps?

I haven't replaced the batteries. The primary battery has a 1/25 sticker on it, but no branding that I can see. I suspect it's a dealer cheepo. I'm think I probably ought to replace both batteries with good quality ones.

 

[JTdiRtyD]

New Jeep Gladiator owner here (2023 Willys v6) and I just came looking for answers about remote start not working with temps around 11F.

It has worked fine each time I have used it in temps 30F and above (that's a rough estimate of temps we've had in the couple months I've owned the Jeep). I'm going to guess maybe 10 remote starts.

This week it's been around 11F in the mornings and highs around 30F. I have attempted 4 remote starts with 1 success. The failed starts were in the early morning when temps were around 11F and the Jeep having sat all night.

The successful remote start came in the evening with temp around 30F and after having driven it around town followed by an hour stopped in a parking lot.

Based on the comments above, this makes me think this may be an issue with the battery (primary or aux?) and sitting idle overnight in below freezing temps?

I haven't replaced the batteries. The primary battery has a 1/25 sticker on it, but no branding that I can see. I suspect it's a dealer cheepo. I'm think I probably ought to replace both batteries with good quality ones.

Mine did this, replaced battery and all is well down to -20 so far (I deleted the Aux battery, so I replaced the main). I had zero other indications of a battery issue, voltage tested fine, so my guess is the IBS is really sensitive and it doesn't take much for it to think the battery is too low, and the rest of the truck systems was dipping the voltage just low enough when cold that it thought it was a dying battery.

 

[vicsvx]

New Jeep Gladiator owner here (2023 Willys v6) and I just came looking for answers about remote start not working with temps around 11F.

It has worked fine each time I have used it in temps 30F and above (that's a rough estimate of temps we've had in the couple months I've owned the Jeep). I'm going to guess maybe 10 remote starts.

This week it's been around 11F in the mornings and highs around 30F. I have attempted 4 remote starts with 1 success. The failed starts were in the early morning when temps were around 11F and the Jeep having sat all night.

The successful remote start came in the evening with temp around 30F and after having driven it around town followed by an hour stopped in a parking lot.

Based on the comments above, this makes me think this may be an issue with the battery (primary or aux?) and sitting idle overnight in below freezing temps?

I haven't replaced the batteries. The primary battery has a 1/25 sticker on it, but no branding that I can see. I suspect it's a dealer cheepo. I'm think I probably ought to replace both batteries with good quality ones.

Per owners manaul. Basically if the battery voltage is too low, remote start won't activate.

 

[flakrat]

I replaced the main and aux batteries prior to the big winter weather system that went through last weekend (just in time) and remote start and normal starts are both working even when in the single digits.

The batteries I took out were a generic dealer main battery and Duralast Aux14 battery. The Duralast had a manufactur date of 01/2024, so 2 years. No idea how long it was actually in use.

- Aux Battery: [Duralast Platinum Group Size 400 AGM Auxiliary Battery AUX14](https://www.autozone.com/p/duralast-platinum-battery-aux14/755654) - $159.99 - SKU 755654 - w/ 3 year warranty
- Main Battery: [Duralast Platinum Group Size 94R H7 Absorbed Glass Mat (AGM) Battery H7-AGM](https://www.autozone.com/p/duralast-platinum-battery-h7-agm/319458) - $259.99 - SKU 319458 - 4 year warranty

I used the method of folding the wheel well cover over to expose the Aux battery to allow removal from below. I removed the main first followed by the aux and installed in reverse order. Is this the recommended order or does it matter?

Something I learned:
- don't screw in the Aux terminal studs in all the way or the nuts won't have enough threads to engage
- Previous owner installed one of the Aux terminal studs upside down and I had to be extra careful using a pair of pliers when loosening it (didn't want to squish the threads)
- Aux terminal studs can be removed with a 4mm socket if you don't have the right size E-Torx socket (E-4?)
- I went in from the bottom, and with 285's it would have been a ton easier to have removed the wheel/tire
- Ensure both batteries are charge before installing (both of mine were)
- I forgot to disconnect the Main to Aux negative cable during the install and got some sparks when connecting the negative cable to the Aux battery.

 

[Labswine]

I actually experienced this for the first time today. It was like 15 degrees out and I hit the remote start, heard the beep and nothing. Tried it again, and 'beep', and nothing. I was like, "Oh shit...guess I'm not running errands today."

But, when I got in and pushed the start button, she roared to life as usual. So, I just dunno what up wid dat...

My battery is factory original (ordered 5/19, delivered 7/19) and I only have around 48K on the clock (the benefits of being retired) so I kinda sorta know I'm tempting fate of being stranded sometime soon but, I guess that's what AAA is for.

 

[Volt0]

Any way to use a camera ( or other person ) to see dash messages while the other person tries the remote start?

 

[JTdiRtyD]

Didn't take long after installing a new battery and mine was failing remote starts again. Remote start works great when it's warm out, and for the first couple weeks it was plenty warm so I had assumed the battery had resolved it, but now that this polar vortex crap is here I'm seeing failed starts again. New battery was tested good and normal starts show zero sign of a weak battery.

I think it has to do with two things, the smart BMS and short commutes. I had read somewhere that the charging system doesn't really charge unless it sees the battery drop below "x" %, instead it just maintains, and you need longer commutes before it will actually put a good charge back in.

I'll start off by stating this following about 12v batteries:

Fully charged = 12.6-12.8 volts
Charged (good) = 12.4 - 12.6 volts
Needs charging = 12.2 - 12.4 volts
Weak = 12.0-12.2 volts
Bad = less than 12 volts

After charging my battery to 100% I'll see mid-high 12's voltage before starting the engine. My commute to work is 20 miles each way, and after a week or so of going to work and short trips into town, my voltage levels out to around 12.4-12.6 volts. Then I drive 2 hours to the fish house and I see my battery back into the fully charged range, 12.6 - 12.8 volts. After getting back home and commuting to work I'll see it level back out around 12.4-12.6 volts. A "good" battery according to the BMS, so my assumption is it's not prioritizing a charge, but just monitoring and maintaining

When remote start fails, it hits the starter and then immediately cancels the start. When I get in the truck after a failed start and watch the voltage, it will bein that 12.4-12.6 range and then dip into low 11's/high 10's for a second as the starter engages, then promptly jumping to mid 13's when the engine starts.

All that to say this, I think the reason our remote start fails when it's cold is the BMS during remote start operations has too high of an allowed voltage tolerance. The BMS aims to keep the battery around the mid 12's. Cold weather decreases battery output, even in a brand new battery, and during remote start operations the dip in voltage during starter engagement drops below the accepted tolerance, so it cancels the start. During the summer the battery output isn't affected, so the dip isn't as big and doesn't cancel the start. This is exaggerated with aux battery deletes (or low/old/bad aux batteries), because the aux battery was enough supplemental amps that cold weather starts didn't dip numbers low enough.

How to fix this? Run a battery maintainer (trickle charger) at night.

 

[Hemy5587]

Didn't take long after installing a new battery and mine was failing remote starts again. Remote start works great when it's warm out, and for the first couple weeks it was plenty warm so I had assumed the battery had resolved it, but now that this polar vortex crap is here I'm seeing failed starts again. New battery was tested good and normal starts show zero sign of a weak battery.

I think it has to do with two things, the smart BMS and short commutes. I had read somewhere that the charging system doesn't really charge unless it sees the battery drop below "x" %, instead it just maintains, and you need longer commutes before it will actually put a good charge back in.

I'll start off by stating this following about 12v batteries:

Fully charged = 12.6-12.8 volts
Charged (good) = 12.4 - 12.6 volts
Needs charging = 12.2 - 12.4 volts
Weak = 12.0-12.2 volts
Bad = less than 12 volts

After charging my battery to 100% I'll see mid-high 12's voltage before starting the engine. My commute to work is 20 miles each way, and after a week or so of going to work and short trips into town, my voltage levels out to around 12.4-12.6 volts. Then I drive 2 hours to the fish house and I see my battery back into the fully charged range, 12.6 - 12.8 volts. After getting back home and commuting to work I'll see it level back out around 12.4-12.6 volts. A "good" battery according to the BMS, so my assumption is it's not prioritizing a charge, but just monitoring and maintaining

When remote start fails, it hits the starter and then immediately cancels the start. When I get in the truck after a failed start and watch the voltage, it will bein that 12.4-12.6 range and then dip into low 11's/high 10's for a second as the starter engages, then promptly jumping to mid 13's when the engine starts.

All that to say this, I think the reason our remote start fails when it's cold is the BMS during remote start operations has too high of an allowed voltage tolerance. The BMS aims to keep the battery around the mid 12's. Cold weather decreases battery output, even in a brand new battery, and during remote start operations the dip in voltage during starter engagement drops below the accepted tolerance, so it cancels the start. During the summer the battery output isn't affected, so the dip isn't as big and doesn't cancel the start. This is exaggerated with aux battery deletes (or low/old/bad aux batteries), because the aux battery was enough supplemental amps that cold weather starts didn't dip numbers low enough.

How to fix this? Run a battery maintainer (trickle charger) at night.

Excellent advice, I typically fully charge up my batteries over night once a month or so throughout the whole year for both my truck and my wife's Grand Cherokee and we have not had any remote start failures due to the cold (knock on wood). My batteries were replaced in October 2024 because it was failing to remote start during the warmer months so I knew I wouldn't make it through winter no matter what I did. However at that point I got 5 years out of the stock batteries and didn't want to push my luck any longer!

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