Auto Start / Stop not ready on new JTRD?

[punk'n]

My 2020 needed the auxiliary battery replaced at 30 miles thanks to the great dealer prep (or lack thereof).

Mine does not display an explanation either. Just "Start/Stop Not Ready".

Sponsored

 

[4MOTION]

Thanks, but no explanation like I stated in the OP. If I’m driving and I’m on the start/stop page it does show an Explanation when the steering wheel is turned, but once I straighten the wheel it just goes back to disabled with no explanation as to why.

Someone or a few people mentioned battery charging. This is true. Also, it does take about 190 to 200 miles before your start-stop starts to work. Mine did this exactly and the product specialist mentioned that.

 

[am1978]

Thanks for the replies. It actually started working today. It was probably either the battery or the outside temperature. Here is the pic with no explanation.

Mine has this too, but it’s been high 90-100 temps for the past couple of weeks in MD. It was working for me in June and July, but not consistently. I’m thinking the crappy little motorcycle battery is t right and when I take it to the dealer for my first oil change I’ll have them check it.

 

[am1978]

Someone or a few people mentioned battery charging. This is true. Also, it does take about 190 to 200 miles before your start-stop starts to work. Mine did this exactly and the product specialist mentioned that.

That’s not accurate. I have a 2018 JL and it worked off the lot with 2 miles on the engine. My other 2018 JL, which I sold when my JT arrived, also worked off the lot with 4 miles on it. My JT does not. Did the dealer imply 190-200 miles on the odometer or per trip? Either way, that sounds like dealer babble.

 

[ShadowsPapa]

That’s not accurate. I have a 2018 JL and it worked off the lot with 2 miles on the engine. My other 2018 JL, which I sold when my JT arrived, also worked off the lot with 4 miles on it. My JT does not. Did the dealer imply 190-200 miles on the odometer or per trip? Either way, that sounds like dealer babble.

Mine worked right off the bat.
The main batteries are modern AGM batteries, not sure about the aux battery but............

If people use the up/down scroll and page up or down to page 7 they'll see the current status.
It's been crazy hot here this year - we had temps into the mid to upper 90s almost earlier than ever before. We tied a record with Florida for dew points (91) so the humidity has been tropical to the max - "feels like" temps in the 130s and 140s at times.
I can take off when the outside temp is in the mid-80s, HVAC set to 67/Auto and by the time I drive a mile, the ESS is working. When it's hotter - in the 90s, it takes sometimes 3 or 4 miles.
The only time I see "battery charging" is when my truck has SAT for 4 or 5 days or the temperature is colder like in the 30s - it doesn't work so well in the winter because batteries are a lot harder to charge in cold temps (that's why older systems had temperature sensing circuits in the regulators if the ambient temperature was lower, the regulator regulated at a higher voltage. In the 70s, it dropped the charging voltage by a few tenths. (I have the charts for one company)
AGM batteries require higher charging voltages if they are run down very far but typical voltages if just for maintenance.
Anyway, with HVAC running in auto, outside temps in the 90s, my ESS works. It normally starts working in anything from 1 mile to about 3 or 4 - especially in the upper 90s, but it DOES work when it's really hot and humid. And my AC keeps up just fine.

 

[CerOf]

My diesel seldom activates the start/stop unless the a/c is off and it is cooler outside.

Winter, spring, seemed to work all the time.

I wouldn’t worry about. Wait until late fall/cooler temps. Still not working? Deal with it then.

 

[13Golumm]

Okay so i changed the small battery under the fuse box because i was getting the service the start stop system. when I got done a picture of a battery came up on the display and it said "stop safely the vehicle will shut off soon". Anybody else seen this and know what I did wrong while putting the battery in? any help would be appreciated

 

[Fpinto]

Hi, just picked up my JTRD today. The auto start / stop is not working (not necessarily a bad thing) and I keep getting a message that the auto start / stop is not ready. No explanation as to why. I assume normally the auto start / stop should work right off the lot on a new diesel? I thought it might be possible that it's disabled until the engine breaks in a bit (unlikely). Any suggestions other than taking it in for service? Thanks

AutoStop-Start work once the Engine is hot enough, otherwise it will give a message AutoStopStart is disabled

 

[ShadowsPapa]

AutoStop-Start work once the Engine is hot enough, otherwise it will give a message AutoStopStart is disabled

There's a lot more to it than that. In the cases being discussed here it's not a matter of the engine not being warm enough.
If it's not warm enough, the cluster will tell you that. If your steering wheel is turned, it will tell you that, if the battery is charging, it will tell you that. These guys are getting a message with no explanation.
This is a long and heavy topic dating back a couple of years........

 

[Fpinto]

There's a lot more to it than that. In the cases being discussed here it's not a matter of the engine not being warm enough.
If it's not warm enough, the cluster will tell you that. If your steering wheel is turned, it will tell you that, if the battery is charging, it will tell you that. These guys are getting a message with no explanation.
This is a long and heavy topic dating back a couple of years........

I am just 9 months with Gladiator with 1st Winter

 

[ShadowsPapa]

I am just 9 months with Gladiator with 1st Winter

Diesels can be very different with the ESS. But for gas engines, there are several scenarios where it won't function. You can use the up/down arrow keys on the left side of the steering wheel to see some detail about the auto start/stop. There are a number of factors that will cause it not to work at any given time, and in the winter, these seem to have problems because of the batteries not being fully charged or the system - the IBS (intelligent battery sensor) not being accurate and sending the PCM inaccurate info.
Don't expect it to work well in cold temps - and not because of engine temp. Here, it works great until our temperatures get below ROUGHLY 40 (F) then it takes some driving to get past the "battery charging" message. Once it hits 0 here it's not going to work (F because I'm in Iowa and the US has decided to live outside of international standards). Once spring comes and the temps stay above 40F then it usually works. If my truck sits 2 or 3 days it may take an hour driving before it stops saying battery charging. It's finicky.
Next time I'm at the dealership I'll talk to them about it - as if the voltage sensing is off at all then batteries won't last anyway and I have some talking to do with them about traction control not working on this truck (I can spin tires and slide sideways taking off from a stop sign - if it was my Javelin I've be happy to let that happen, but not this truck)

These trucks and Jeeps in general have a bad reputation for batteries........ they've also had some IBS issues - where the dealers had to rest them or whatever process they are following to get the thing to correctly sense true battery load and voltages.
I'm the sort I want batteries to last at least 6 years, 5 at the least if it's a cheap $39,95 Walmart battery. And batteries being run down too far or not being charged up fully after every start shortens their life bigly.

Sponsored