ESS Not Ready, Battery Charging - Page 2 - 2014+ Jeep Cherokee Forums
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post #11 of 46 (permalink) Old 10-22-2015, 10:25 AM
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I too had this problem when I first got my TH. However after a week or two like canphan said it just started working out of blue. I would give it a couple weeks and if it doesn't start working by then, then I would take it in.

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post #12 of 46 (permalink) Old 10-22-2015, 10:35 AM
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Is it cold where you are? Are you running max AC/heater? It does have certain operating ranges that would inhibit it from engaging.
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post #13 of 46 (permalink) Old 10-22-2015, 11:44 AM
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x 2... for me too...

The ESS system is somewhat sensitive. Yes, the batter may show 14V+, however that does not mean it is fully charged. The battery may even test OK, however there is an algorithm the system uses to determine if ESS should be enabled.

When I added my dash cam I noticed ESS enabled less and often not at all as the battery must be in a 'perfect' state.

After driving for several hours I noticed it started to engage.


Quote:
Originally Posted by canphan View Post
I've only had my Cherokee for a month and for the first two weeks I got the same message. The battery was solidly at 14.4v but it always said it needed to charge for the ESS to work. Just about the time I was getting ready to call the dealership I was coming home and had to make a left turn across fairly heavy traffic. I had the radio up pretty loud and didn't notice that the engine had shut off while I was waiting for a gap to make my turn. Needless to say I got a bit of a surprise when I felt the vehicle start up right before I had to make a quick maneuver! :-)

Anyway, all that to say: chances are the ESS will suddenly start working one day. Not sure when/how it decides that the battery is strong enough but my guess is it will eventually.

Good luck!



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post #14 of 46 (permalink) Old 10-22-2015, 12:32 PM
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It would be interesting to see what the algorithm is. I also don't know the specs for the charging system, but perhaps 14.4V means full charging voltage and ESS may take that as a *not ready* sign, waiting on voltage to drop a bit (= trickle charge).

Two weeks is a long time for a battery to achieve optimal status ; perhaps this happens when a car sits on a lot for a certain period of time. Mine had ESS available as I left the dealership with 22 miles on the odometer, but the car went from assembly line to me with no wait.

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post #15 of 46 (permalink) Old 10-22-2015, 01:14 PM Thread Starter
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Originally Posted by Mark_ View Post
perhaps this happens when a car sits on a lot for a certain period of time.
This could be a factor. My car has a build date of 4/15 but I took delivery last week. Considering I got it with 14 miles on it, It is very likely that they received it and it sat on the storage lot until I expressed interest. It wasn't even on the main lot the first time I went to the dealership.


I'll keep an eye on it for a little while longer. Since it is not a huge issue i'm not in a rush to take the time to get it to the dealership and likely be without it for a day or two. If it is still being grumpy in two weeks i'll swing it by the dealership.

Side note: reseating the ESS plug on the battery did nothing noticeable.

I appreciate everyone's input, and i'll keep the post updated when anything changes.


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post #16 of 46 (permalink) Old 10-22-2015, 01:34 PM
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Originally Posted by HazzardSky View Post
Greetings!

I've only had my TH for a little over a week, and absolutely love it so far, but I'm having a potential issues with the ESS system. The dealer explained the system to me before leaving the lot, and I actually think it could be pretty cool on occasion, since i have two lights on the way to work that take forever to turn, and it would save me manually turning off the engine.

Since I've had it (only 350 miles) I have not yet had the ESS activate, and on the dash it says it is not ready, Battery Charging. The battery status shows it at 14.4v and steady. It dips a bit lower right after I start it up of course, but only takes a few moments to charge it back up.

Has anyone else encountered anything like this? Is there a mileage limit it needs to hit before it starts working? Temperatures have been in the 70s the past few days, so I dont think that is holding it up.

I'm not in a hurry to take it back to the dealer for a small issue like this, but would someday like to at least have the option of trying it out. Any input would be appreciated.

Cheers
Funny enough, I had this exact same issue, took it to the dealer they couldn't figure it out (of course just like everything else for the most part).

I had an amplifier+subwoofer installed and the problem went away, I didn't even realize really until I read this thread and remembered about it.
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post #17 of 46 (permalink) Old 10-22-2015, 02:59 PM
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This happens to me all the time when I have my ARB fridge plugged in and on for even a few hours without starting my Cherokee. Driving to work and back will never give the battery enough juice. Driving for 15-20 on the highway and I'm back to normal.

I did use the EVIC to monitor the voltage. Basically when ESS engages the voltage drops to around 12.1v - 12.4v. So the issue isn't the battery being at 14.x volts with the vehicle on and the alternator working, but really the voltage under load without the alternator compensating.

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post #18 of 46 (permalink) Old 10-22-2015, 04:06 PM
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Originally Posted by DZOnline View Post
This happens to me all the time when I have my ARB fridge plugged in and on for even a few hours without starting my Cherokee. Driving to work and back will never give the battery enough juice. Driving for 15-20 on the highway and I'm back to normal.

I did use the EVIC to monitor the voltage. Basically when ESS engages the voltage drops to around 12.1v - 12.4v. So the issue isn't the battery being at 14.x volts with the vehicle on and the alternator working, but really the voltage under load without the alternator compensating.
I thought of that, but the *decision* to allow Stop happens when the engine is running, so the sensor is picking up charge voltage.

OP's Jeep seemingly sat for 5 months. That's enough to drain a battery slightly beyond normal parameters. I just checked mine on teh way home an hour ago : charging voltage on the go was 14.1-14.2 tops. My guess is that 14.4V will deactivate ESS.

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post #19 of 46 (permalink) Old 10-22-2015, 04:18 PM
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I've only had my '15 Trailhawk a week but a couple of items for you:

1) if you don't press firmly on the brake, it might not engage.
2) if your climate control is working to moderate the cabin temperature, it might not engage or list "charging" even if you are at 14.4.
3) if you are using all the electronics (radio blasting while actively navigating, lights on), it might not engage.

Here in TX, it doesn't kick in on repeat lights when the AC is trying to correct for 90F outside . Otherwise, it will work.

However, if you have the AC and radio off, lights off, and drive for a bit without braking, it should charge up inside 20 minutes of driving and start to work.

I had to figure out 1-3 with trial and error.
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post #20 of 46 (permalink) Old 10-22-2015, 04:32 PM
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Quote:
Originally Posted by jstrange1970 View Post
I've only had my '15 Trailhawk a week but a couple of items for you:

1) if you don't press firmly on the brake, it might not engage.
2) if your climate control is working to moderate the cabin temperature, it might not engage or list "charging" even if you are at 14.4.
3) if you are using all the electronics (radio blasting while actively navigating, lights on), it might not engage.

Here in TX, it doesn't kick in on repeat lights when the AC is trying to correct for 90F outside . Otherwise, it will work.

However, if you have the AC and radio off, lights off, and drive for a bit without braking, it should charge up inside 20 minutes of driving and start to work.

I had to figure out 1-3 with trial and error.
I can probably shed some light on a few of those points :

- When it's hot outside, there are a few parameters that can and will disable ESS;
Cabin temperature is monitored closely. This would be the most frequent cause of short or no engine stopping in hot climates.
Extreme outside temperature (we've guessed around 94F to be the trip point) will disengage ESS.
Battery status of course, if the HVAC fan is blowing full blast for example.
- If you ever get low enough on fuel to get the Low fuel light, ESS will be disengaged. We've discussed this as being weird, especially since ESS is supposed to be a fuel saver, but what can you do... haha.

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