Automatic Engine Stop Start Issue

[WXman]

Could you link that video?

It's here:



It happens toward the end of the video.

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[Avl2294]

Hi there,
I have had my JLUR with automatic for about 11 days - yay. Have put about 1200 miles on it so far and have learned a few interesting things about my engine auto start stop and was wondering if anyone else was experiencing the same thing.

In heave freeway bumper to bumper traffic for period more than 15 minutes. The auto start stop will stop functioning. I get a dash message that states the system is not ready. Once this happens...it will not be ready again until I either have a long period of normal driving or I let park the car for a while. The only explanation I can gather is that the battery for this system gets below some threshold and causes it to not restart its functionality until the battery is at a proper charge. The main battery must charge the auto start stop battery while its parked.

I know I could easily turn off the system and save my self the headache but if the above is true it would seem a simple switch cut off to the second battery would be a simple permanent bypass that would be easy to install.

Ok... last oddity. When the auto start stop is working...and I pull into a parking spot. The engine cuts off but then when placing the car in to park...it causes the engine to restart. This seems like it should not happen. Is this happening to anyone else? it may not be Park that is causing the restart, it could be coming out of Drive, or going into Reverse...dont know exactly...but annoying nonetheless.

Anyone else having the above issues?

As for the first problem, this is very normal for almost if not ALL stop/start systems...the same should happen if you are at a stop light, the engine shuts off, at this point if you let off the brake to creep forward and stop again, the engine will stay running and give you the same message. I'm not going to lie and tell you i know why this feature exists, but I will tell you its quite normal.

 

[MBLY]

It’s one feature they should never done.

 

[Jeepsterfreak]

Ok... last oddity. When the auto start stop is working...and I pull into a parking spot. The engine cuts off but then when placing the car in to park...it causes the engine to restart. This seems like it should not happen. Is this happening to anyone else? it may not be Park that is causing the restart, it could be coming out of Drive, or going into Reverse...dont know exactly...but annoying nonetheless.

Anyone else having the above issues?

I never really understood this either. Why would the engine restart when attempting to park? The owner's manual describes this very scenario. I suppose you have to turn off the ignition prior to shifting out of drive as another poster recommended. Just seems odd. When parking, if your foot is still on the brake pedal you should be able to shift into park without the engine re-starting. Maybe it is designed this way so you don't forget to turn off the vehicle. Let's say you park, foot on the brake, engine shuts off, you shift into Park (engine still off). Now you exit the vehicle. You forget to press the ignition button to kill the vehicle before exiting because the engine was already off. When you leave the vehicle with the fob, does the vehicle automatically shut down so it does not stay in ACC? I read that the ignition will automatically turn OFF after 30 minutes of inactivity.

 

[digitalbliss]

Hi there,
I have had my JLUR with automatic for about 11 days - yay. Have put about 1200 miles on it so far and have learned a few interesting things about my engine auto start stop and was wondering if anyone else was experiencing the same thing.

In heave freeway bumper to bumper traffic for period more than 15 minutes. The auto start stop will stop functioning. I get a dash message that states the system is not ready. Once this happens...it will not be ready again until I either have a long period of normal driving or I let park the car for a while. The only explanation I can gather is that the battery for this system gets below some threshold and causes it to not restart its functionality until the battery is at a proper charge. The main battery must charge the auto start stop battery while its parked.

I know I could easily turn off the system and save my self the headache but if the above is true it would seem a simple switch cut off to the second battery would be a simple permanent bypass that would be easy to install.

Ok... last oddity. When the auto start stop is working...and I pull into a parking spot. The engine cuts off but then when placing the car in to park...it causes the engine to restart. This seems like it should not happen. Is this happening to anyone else? it may not be Park that is causing the restart, it could be coming out of Drive, or going into Reverse...dont know exactly...but annoying nonetheless.

Anyone else having the above issues?

I don't think your battery solution would work. It's been shown that if the 2nd smaller battery is disconnected, the Jeep will not start.

 

[xeon]

I don't think your battery solution would work. It's been shown that if the 2nd smaller battery is disconnected, the Jeep will not start.

I don’t think it has to be disconnect.. just need to fool the system in thinking it’s voltage is at a limit where the auto stop is not engaged. I am thinking it could be done programmatically by setting the voltage limit. Going to dig into it and see. Could be completely wrong though

 

[rallydefault]

Never had that happen, sorry man.

But I turn mine off 100% of the time and I'm getting 21 mpg. Obviously it's something you're going to get looked at no matter what, but even if you end up turning off the system you shouldn't have to worry about only getting 12.5 mpg.

 

[digitalbliss]

I don’t think it has to be disconnect.. just need to fool the system in thinking it’s voltage is at a limit where the auto stop is not engaged. I am thinking it could be done programmatically by setting the voltage limit. Going to dig into it and see. Could be completely wrong though

I know the tazer guys say their product can turn it off, so I can definitely be programmed.

 

[xeon]

I never really understood this either. Why would the engine restart when attempting to park? The owner's manual describes this very scenario. I suppose you have to turn off the ignition prior to shifting out of drive as another poster recommended. Just seems odd. When parking, if your foot is still on the brake pedal you should be able to shift into park without the engine re-starting. Maybe it is designed this way so you don't forget to turn off the vehicle. Let's say you park, foot on the brake, engine shuts off, you shift into Park (engine still off). Now you exit the vehicle. You forget to press the ignition button to kill the vehicle before exiting because the engine was already off. When you leave the vehicle with the fob, does the vehicle automatically shut down so it does not stay in ACC? I read that the ignition will automatically turn OFF after 30 minutes of inactivity.

Thanks for the post ... should have looked at that manual first.

I have noticed if I cycle through from drive to park slowly ... happens less frequently. Ultimately going to shut this feature off. JUst not getting an MPG difference worth having the Jeep restart so many times.

 

[JeepCares]

Hi there,
I have had my JLUR with automatic for about 11 days - yay. Have put about 1200 miles on it so far and have learned a few interesting things about my engine auto start stop and was wondering if anyone else was experiencing the same thing.
In heave freeway bumper to bumper traffic for period more than 15 minutes. The auto start stop will stop functioning. I get a dash message that states the system is not ready. Once this happens...it will not be ready again until I either have a long period of normal driving or I let park the car for a while. The only explanation I can gather is that the battery for this system gets below some threshold and causes it to not restart its functionality until the battery is at a proper charge. The main battery must charge the auto start stop battery while its parked.
I know I could easily turn off the system and save my self the headache but if the above is true it would seem a simple switch cut off to the second battery would be a simple permanent bypass that would be easy to install.
Ok... last oddity. When the auto start stop is working...and I pull into a parking spot. The engine cuts off but then when placing the car in to park...it causes the engine to restart. This seems like it should not happen. Is this happening to anyone else? it may not be Park that is causing the restart, it could be coming out of Drive, or going into Reverse...dont know exactly...but annoying nonetheless.
Anyone else having the above issues?

Hi xeon,
We understand how these concerns could be frustrating. We understand you are just reaching out to other forum members at this time for feedback on your concerns. However, if you do choose to visit a dealer to have any of this looked into further, please let us know! Just send us a PM with additional details.
Julie
Jeep Social Care Specialist

 

[Skippy]

I have found that when pulling in to a parking spot (just like when I don't want the jeep to turn off), if I lightly use the brake versus heavy footing it the jeep will not turn off or the ESS doesnt engage. That is my little way around it. The jeep still stops fine and when/where I want it to but it doesn't activate the ESS. Also, if you think you will be putting it in park right before you get to the full stop you could just put it in neutral and cost another foot or so in to the spot. I know neither are ideal. it would be nice to have a programmable feature of "if I am stopped for x amount of time then activate ESS"

 

[Ntegtmeyer]

Hi there,
I have had my JLUR with automatic for about 11 days - yay. Have put about 1200 miles on it so far and have learned a few interesting things about my engine auto start stop and was wondering if anyone else was experiencing the same thing.

In heave freeway bumper to bumper traffic for period more than 15 minutes. The auto start stop will stop functioning. I get a dash message that states the system is not ready. Once this happens...it will not be ready again until I either have a long period of normal driving or I let park the car for a while. The only explanation I can gather is that the battery for this system gets below some threshold and causes it to not restart its functionality until the battery is at a proper charge. The main battery must charge the auto start stop battery while its parked.

I know I could easily turn off the system and save my self the headache but if the above is true it would seem a simple switch cut off to the second battery would be a simple permanent bypass that would be easy to install.

Ok... last oddity. When the auto start stop is working...and I pull into a parking spot. The engine cuts off but then when placing the car in to park...it causes the engine to restart. This seems like it should not happen. Is this happening to anyone else? it may not be Park that is causing the restart, it could be coming out of Drive, or going into Reverse...dont know exactly...but annoying nonetheless.

Anyone else having the above issues?

As far as your first issue goes, you are right and that is normal. The battery voltage is too low and it cuts off the system before the vehicle won't restart. As far as your second thing, I have learned not to push fully down on the brake pedal all the way or to shift into park fast--engine won't shut off if you do either

 

[Biscuit]

Anyone else having the above issues?

Have you read your owner's manual yet? If you had, you'd know that's how it's supposed to work. And when you shift to park, the engine restarts because your ignition is still in run mode. Turn off the ignition.

 

[xeon]

Have you read your owner's manual yet? If you had, you'd know that's how it's supposed to work. And when you shift to park, the engine restarts because your ignition is still in run mode. Turn off the ignition.

Well nice to see we are not without wit. However the problem was resolved at the dealer. No more issue.

 

[Capricorn]

Hi there,
I have had my JLUR with automatic for about 11 days - yay. Have put about 1200 miles on it so far and have learned a few interesting things about my engine auto start stop and was wondering if anyone else was experiencing the same thing.

In heave freeway bumper to bumper traffic for period more than 15 minutes. The auto start stop will stop functioning. I get a dash message that states the system is not ready. Once this happens...it will not be ready again until I either have a long period of normal driving or I let park the car for a while. The only explanation I can gather is that the battery for this system gets below some threshold and causes it to not restart its functionality until the battery is at a proper charge. The main battery must charge the auto start stop battery while its parked.

I know I could easily turn off the system and save my self the headache but if the above is true it would seem a simple switch cut off to the second battery would be a simple permanent bypass that would be easy to install.

Ok... last oddity. When the auto start stop is working...and I pull into a parking spot. The engine cuts off but then when placing the car in to park...it causes the engine to restart. This seems like it should not happen. Is this happening to anyone else? it may not be Park that is causing the restart, it could be coming out of Drive, or going into Reverse...dont know exactly...but annoying nonetheless.

Anyone else having the above issues?

I have the same issue too (your first issue). I am wondering if the Aux battery cannot take that much load of more than 5 or 6 stops at stoplights (at least in my case). But in my case, I get an orange A! light on with a chime. And that satays throughout the time till I restart the Jeep next time.

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