ESS Start / Stop disabled

[dj3513]

Not sure if this has been posted ( I searched ). When my Jeep is in park an idling for 10-15 minutes I receive a message that Start / Stop has been disabled. If I turn the Jeep off and back on the message clears and ESS will work fine. Has anyone encountered this? Thanks in advance!!!!

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[Sean L]

Not sure the exact cause for it, but I guess it might have something to do with the battery temperature. Just a guess but if its not giving you a service start/stop warning it should be all right.

 

[smithrd65]

I personally I like the ESS system if it saves me a gallon of gas a year and saves the Earth I'm all in. Maybe the next few generation will do the same.

 

[Nomad]

Mine 18 JL Sport S is at the dealer right now for this. It took three tries before they even took a shot at fixing it. It seems like now they have a procedure of things to test. I can understand that perhaps they have to deal with an issue a few times for it to become an official service issue and not just a fluke. When I get it back I'll let you know if it's fixed and what they did to fix it. Supposed to be just one day unless they need to order backordered parts.

 

[dj3513]

Mine 18 JL Sport S is at the dealer right now for this. It took three tries before they even took a shot at fixing it. It seems like now they have a procedure of things to test. I can understand that perhaps they have to deal with an issue a few times for it to become an official service issue and not just a fluke. When I get it back I'll let you know if it's fixed and what they did to fix it. Supposed to be just one day unless they need to order backordered parts.

Thanks!! Please keep me posted. My Jeep goes in on Tuesday.

 

[Nomad]

Thanks!! Please keep me posted. My Jeep goes in on Tuesday.

Well sadly, not resolved. I drove around until the error happened and then brought it in, left it running, showed the service manager guy... But the tech shut the engine before reading the code and now they say for the THIRD TIME that they can't fix what they can't get a code for. So basically I took a day off work for an oil change. @JeepCares Gotta say I'm more than a little angry now. Three times in the shop without AN ATTEMPT to fix it.

 

[Rahneld]

Not sure if this has been posted ( I searched ). When my Jeep is in park an idling for 10-15 minutes I receive a message that Start / Stop has been disabled. If I turn the Jeep off and back on the message clears and ESS will work fine. Has anyone encountered this? Thanks in advance!!!!

I don't have an answer but am curious as to the nature of the situation where the very thing that seems to fix this: turning the engine off, isn't otherwise indicated given the amount of time you remain idle?

I'm not out to pick a fight. Emergency Service vehicles by me, for example, like fire apparatus, including the chief's SUV remain on for the duration of a call. So you very well may have good reason I simply don't know about. : - )

 

[pablo_max3045]

I am also a bit curious why you would not just turn the engine off, rather than let it idle for 15 minutes. I could see doing that at startup for 5-10 min or so in winter to heat up the cabin and clear the windshield.
The system is not designed to work while in park. Otherwise, things like remote start would not be possible as the system would just turn itself back off. Plus, when people put the car in park after driving, they would normally turn the motor off and leave the car.

 

[dj3513]

I am also a bit curious why you would not just turn the engine off, rather than let it idle for 15 minutes. I could see doing that at startup for 5-10 min or so in winter to heat up the cabin and clear the windshield.
The system is not designed to work while in park. Otherwise, things like remote start would not be possible as the system would just turn itself back off. Plus, when people put the car in park after driving, they would normally turn the motor off and leave the car.

Hot day , AC was on. Was picking the kids up from school waiting for them to get out.

 

[pablo_max3045]

Hot day , AC was on. Was picking the kids up from school waiting for them to get out.

Then it would definitely make sense that the system cannot be activated and be automatically disabled. When my AC is on and it's warm the system will not shut off the engine, even at a traffic light.

 

[JeepCares]

Well sadly, not resolved. I drove around until the error happened and then brought it in, left it running, showed the service manager guy... But the tech shut the engine before reading the code and now they say for the THIRD TIME that they can't fix what they can't get a code for. So basically I took a day off work for an oil change. @JeepCares Gotta say I'm more than a little angry now. Three times in the shop without AN ATTEMPT to fix it.

Hi Nomad,
I understand your frustration. We'd like to help you get this addressed. Please send us a private message if you'd like us to have a case escalated so a Case Specialist can work with your dealer to help find a potential solution to this.
Lydia
Jeep Social Care Specialist

 

[Rahneld]

Hot day , AC was on. Was picking the kids up from school waiting for them to get out.

Here's a theory. Your not revving the engine during your described scenario so the alternator, despite perhaps providing the max current it can't for what electric it can make spinning off the rotating wheels attached to the idling engine, falls short of what the AC was demanding of both batteries.

Those batteries, at least on the 3.6L, are connected in parallel 99.9% of the time but for a brief instant during engine cranks and during an ESS event.

This may have taxed both batteries, specifically here the ESS battery to a point where the ESS system would not engage, as the 3.6L checks this ESS battery's voltage and will only engage the ESS system if that voltage is high enough.

Rarely, when I'm in an ESS event will I last the duration of a traffic light if the A/C is on.

And I plug my 3.6L into a trickle charger when its a rest at home: which charges both batteries (hooked up in parallel during vehicle rest too.) An ESS event will end before the operator takes their foot off the brake if the ESS battery's voltage drops during the ESS event below a threshold as well.

And this is the case because when the engine cranks, cold or after an ESS event, it is the ESS battery on the 3.6L that is momentarily isolated, to all on its own signal the starter relay (not the starter, but the starter relay) to fire the engine starter. A dead ESS battery will result in a 3.6L that will not crank, barring some wiring techniques I can point you too if you are more curious.

Before the starter "does its thing," both batteries are reconnected in parallel to each provide the current draw the starter needs to overcome inertia and crank the engine.

I hope this helps. : - )

 

[Jebiruph]

The ESS system is very picky, and rightfully so, to avoid any auto stops with possibly marginal batteries. The system either detects a voltage drop or a time limit was exceeded from the long idle with AC on. It also will not auto stop by design with Max AC on (per owners manual). I think the system is working as designed.

 

[twisty]

Not sure if this has been posted ( I searched ). When my Jeep is in park an idling for 10-15 minutes I receive a message that Start / Stop has been disabled. If I turn the Jeep off and back on the message clears and ESS will work fine. Has anyone encountered this? Thanks in advance!!!!

Sounds normal to me. Go to your manual and read up on it. I recall it telling you how it's supposed to behave.

I put in the tazor to rid myself of the ESS disease, but even with it the ESS sometimes shows it's ugly head for some reason. lol

 

[twisty]

Mine 18 JL Sport S is at the dealer right now for this. It took three tries before they even took a shot at fixing it. It seems like now they have a procedure of things to test. I can understand that perhaps they have to deal with an issue a few times for it to become an official service issue and not just a fluke. When I get it back I'll let you know if it's fixed and what they did to fix it. Supposed to be just one day unless they need to order backordered parts.

My ESS took a chit right from the show room floor. DIdnt know a thing about ESS but the condition got worse and worse. I brought it in and they couldnt figure it out either. They brought in a rep to figure it out and found a short in the wiring harness. Just what everyone wants to hear with a new high dollar vehicle purchase. lol They of course assured me it was fixed professionally and it hasnt been a problem since so I'm hopeful.

ESS is a scourge IMO. Not jeeps fault, likely government nonsense. I go out of my way now to burn gas unnecessarily. It helps that I own oil stocks. lol

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