Remote Start 22 cold weather package

[C1v1leng]

Tried my remote start today @17 degrees. Horn tooted twice and starter engaged but didn’t turn over. Waited a few minutes and tried again no joy. Went out and hit the button and it started right up. This happened once before then it started working again. It always seems to work when it’s warm outside but that defeats the purpose.

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[Rusty PW]

Battery getting low.

 

[JTdiRtyD]

Mine does the same, and it's random. Some days remote start works fine, even in -10 deg temps and sitting for days, other days it hits the starter and then stops. Starts without struggle or any indication of hard rotations when pushing the button. Tested the old battery and it tested fine, but it was getting older so I replaced it, but new battery didn't solve it.

I do have aux battery deleted. I thought this was the issue at first but I've read others with fresh main and aux batteries having the same issue. I think it's just a finicky BMS with a cutoff tolerance that's too high for the remote start.

My other thought is the battery isn't getting back to a 100% charge while driving. I was in town a bit this past weekend, and yesterday at work the remote start failed. My drive to work is 20 miles, which should be enough to get a full charge back into the battery, but add in some running around town where the truck is off and on multiple times a day and maybe those multiple starts are draining the battery enough that it's not getting back to a full charge for a few days. I'm going to run a Noco 1a maintainer each night and see if my remote start issues go away.

 

[Hemy5587]

Battery getting low.

I agree, mine started tooting but no starting and it was warm outside at the time.

 

[LouisvEarlleJT]

I was pleasantly surprised, 0 degrees, 3 yr old batteries, and mine started right up yesterday. No slow crank or anything!

 

[JTdiRtyD]

Horn tooted twice and starter engaged but didn’t turn over.

I agree, mine started tooting but no starting and it was warm outside at the time.

Toot!

The immature boy in me can't help but chuckle seeing this TWICE in one thread.

 

[Hemy5587]

Toot!

The immature boy in me can't help but chuckle seeing this TWICE in one thread.

Hey I giggled when I typed it

 

[BlueScapegoat]

Mine did that for the first time when it hit -15° the other day. Lights flashed but didn't hear a thing. Fired right up with the button, no reason displayed for the rejected start.

I'm not worried about it.

 

[Iam_Gladiator]

I’ve tried to add the remote start to my vehicle from the dealer and I have a 22 Eco diesel as well. I am told that the radio signals get in the way with the TPM sensors

 

[JTdiRtyD]

I'll repost this here as well...


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.

 

[Casique]

Mine did the same with a 5 year old battery. Started fine inside. Battery was ritually charged when the Jeep was not used for more than 2 days. Replaced and did aux battery delete. Remote start now works normally. Remote start failed when it got down to 38* here in Fort Lauderdale FL.

 

[C1v1leng]

I drove the Jeep in the morning and again in the afternoon temperature was 59. Hit the remote start for the afternoon trip and the starter engaged then immediately stopped. I will check the voltage next time it happens.

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