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Discussion Starter #1
New to a vehicle with the "Start/Stop" Engine System.

I noticed that the Dash was showing the "A" in "amber" with an "exclamation" mark (!) beside it. Also, when starting the vehicle it gives a message "Start/Stop Unavailable Service Start/Stop System"

I just picked this vehicle up as a dealer demo, and am wondering if the system was "overridden"? (It was the dealerships wife that was driving this)

I called the Service Dept and they asked if the battery had recently been removed. (I have no idea) They suggested trying it for a few days to see if the system "resets" itself.

Worst case scenario ................... I take it in for service.

Any suggestions?????
 

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There is a switch under the hood some have disabled the system by bending the bracket so the switch no longer contacts the hood. It is a great idea but to my understanding this will also disable remote start. I don't know if this would throw a code but might be worth looking at. The only other thing I have seen often posted on this is one of the batteries being weak. I would try driving a bit and see if it corrects itself!
 

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Discussion Starter #3
I did look under the hood to see if the "plunger switch" (?) had been disconnected. Also, the remote start works fine. I am going to try driving it for another 2 or 3 days before I head back to the Service Dept. :(
 

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New to a vehicle with the "Start/Stop" Engine System.

I noticed that the Dash was showing the "A" in "amber" with an "exclamation" mark (!) beside it. Also, when starting the vehicle it gives a message "Start/Stop Unavailable Service Start/Stop System"

I just picked this vehicle up as a dealer demo, and am wondering if the system was "overridden"? (It was the dealerships wife that was driving this)

I called the Service Dept and they asked if the battery had recently been removed. (I have no idea) They suggested trying it for a few days to see if the system "resets" itself.

Worst case scenario ................... I take it in for service.

Any suggestions?????

Hi 10-64,
We recognize that you are just reaching out to other forum members at this time for advice. However, if you need any additional assistance when you visit the dealer, please feel free to send us a PM with additional information.
Julie
Jeep Social Care Specialist
 

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Discussion Starter #5
Hi 10-64,
We recognize that you are just reaching out to other forum members at this time for advice. However, if you need any additional assistance when you visit the dealer, please feel free to send us a PM with additional information.
Julie
Jeep Social Care Specialist
@JeepCares - It's booked back in at the dealership on Tuesday. They want it for the day. (I thought it might just be a quick reflash on the computer module)
Looking forward to the feature, when its operational! smile:
 

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The secondary battery is probably weak. If it has low voltage it will disable the start/stop when you start the vehicle. Mine does it every once in awhile if I let the car sit for longer than a day without driving it, but once I drive it for 5 minutes, turn the vehicle off and back on again start/stop is enabled again and then I push the button to disable it LOL

There has been a bunch of people that have had the secondary battery replaced due to being bad.

How the start/stop system works is you have two batteries:
The main battery (normal automotive battery) which has cranking power (amps) to start the car via the starter.
The secondary battery which is just a high capacity battery but with very little amps and cannot power the starter (very similar to a car audio battery)

When you stop at a light and the engine shuts off, everything (radio, lights, heater..etc) gets powered by the secondary battery, when you let off the brake and the engine starts back up (via the main battery) everything continues to stay on and the electrical load is back on the main battery. If the secondary battery voltage is low when you turn the vehicle on, start/stop is automatically disabled because if it were to start/stop at a light when the engine shuts off so does the entire car. If does not automatically enable itself when the secondary battery is charged until you power off/on the vehicle.
 

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Discussion Starter #7
The secondary battery is probably weak. If it has low voltage it will disable the start/stop when you start the vehicle. Mine does it every once in awhile if I let the car sit for longer than a day without driving it, but once I drive it for 5 minutes, turn the vehicle off and back on again start/stop is enabled again and then I push the button to disable it LOL

There has been a bunch of people that have had the secondary battery replaced due to being bad.

How the start/stop system works is you have two batteries:
The main battery (normal automotive battery) which has cranking power (amps) to start the car via the starter.
The secondary battery which is just a high capacity battery but with very little amps and cannot power the starter (very similar to a car audio battery)

When you stop at a light and the engine shuts off, everything (radio, lights, heater..etc) gets powered by the secondary battery, when you let off the brake and the engine starts back up (via the main battery) everything continues to stay on and the electrical load is back on the main battery. If the secondary battery voltage is low when you turn the vehicle on, start/stop is automatically disabled because if it were to start/stop at a light when the engine shuts off so does the entire car. If does not automatically enable itself when the secondary battery is charged until you power off/on the vehicle.
I've been driving it almost a week now, and I'm thinking it's "not" the Secondary battery. I guess I'll know for sure in 2 days.
 

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@JeepCares - It's booked back in at the dealership on Tuesday. They want it for the day. (I thought it might just be a quick reflash on the computer module)
Looking forward to the feature, when its operational! smile:
Thanks for updating me on this, 10-64. If you need any additional assistance while you are there, please feel free to send us a PM with your VIN, phone number, current mileage and servicing dealer.
Julie
Jeep Social Care Specialist
 

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Discussion Starter #9
FIXED, and loving it so far. Let's see what happens to the fuel economy now that the engine shuts down at stops.
Apparently, the computer needed to be "flashed/updated" in 2 areas.
 

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FIXED, and loving it so far. Let's see what happens to the fuel economy now that the engine shuts down at stops.
Apparently, the computer needed to be "flashed/updated" in 2 areas.
Hi,

Could you give us more details of how it was that they fixed the fault? also what you want to mean with: "flashed/updated" in 2 areas?

Regards,
 

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Discussion Starter #11
Hi,

Could you give us more details of how it was that they fixed the fault? also what you want to mean with: "flashed/updated" in 2 areas?

Regards,
The service dept said they rebooted 2 different modules. Because the vehicles still under warranty I didn't sign anything when I picked it up. I could try to check and see which modules they worked on.
 

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FIXED, and loving it so far. Let's see what happens to the fuel economy now that the engine shuts down at stops.
Apparently, the computer needed to be "flashed/updated" in 2 areas.

What is your split of city and highway miles? This will directly impact how much of a difference you will see prior to the system being fixed.
 

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Currently, it's predominately "city" driving
Then you should notice approximately a 1 mpg difference, maybe 2. That seemed to be about what mine was doing when it was too cold for the system to function last winter, vs. when the winter temps would moderate enough to allow it to work.
 

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When I picked up my Compass, the service ESS light came on right away. I figured maybe the battery was low since the car was sitting on the lot. After a week it didn't go out, so I called the dealer and scheduled an appointment for today. After sitting at the dealership for 6 hours today, the technician comes to get me and explains that he tested the battery and it was good, however the connection to the battery was bad. He fixed the connection and reset the code. We went on a quick test drive around the block and the ESS system worked perfectly. I left the dealer and drive to work. 2 1/2 hours later I leave to pick up my kids, and the engine doesn't turn off at the 1st light, After a few red lights with the motor constantly running, I change the display to show the ESS status. I have a message showing the system is not ready because the battery is charging. After the 45 minute drive in traffic to my boys' school, I figured the battery must be charged by now. No luck. Now it looks like tomorrow I will be back at the dealership to see what the problem is again. I plan on leaving the car there until they figure it out. A car less than 2 weeks old should not have to be in for repairs already. I love the Compass, but if this can't be fixed, I will have to look for a replacement.

Sent from my SM-G935W8 using Tapatalk
 

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When I picked up my Compass, the service ESS light came on right away. I figured maybe the battery was low since the car was sitting on the lot. After a week it didn't go out, so I called the dealer and scheduled an appointment for today. After sitting at the dealership for 6 hours today, the technician comes to get me and explains that he tested the battery and it was good, however the connection to the battery was bad. He fixed the connection and reset the code. We went on a quick test drive around the block and the ESS system worked perfectly. I left the dealer and drive to work. 2 1/2 hours later I leave to pick up my kids, and the engine doesn't turn off at the 1st light, After a few red lights with the motor constantly running, I change the display to show the ESS status. I have a message showing the system is not ready because the battery is charging. After the 45 minute drive in traffic to my boys' school, I figured the battery must be charged by now. No luck. Now it looks like tomorrow I will be back at the dealership to see what the problem is again. I plan on leaving the car there until they figure it out. A car less than 2 weeks old should not have to be in for repairs already. I love the Compass, but if this can't be fixed, I will have to look for a replacement.

Sent from my SM-G935W8 using Tapatalk
Hi Key Reign,

We are sorry to hear that you are experiencing concerns with your battery and ESS. Please send us your VIN, mileage, and dealer so that we can create a case on your behalf to offer further assistance while in service.

Darlene
Jeep Social Care Specialist
 

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I got the "A!" warning light in my first week, about 80 miles old.
The dealership told me they removed 2 fails (from ECU I think) and made something like a "proxy rebuild", I can't remember the "tech" name/expression.
They recharged the ESS battery too.
For now, about 250 miles, everything is running ok.
 

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When I picked up my Compass, the service ESS light came on right away. I figured maybe the battery was low since the car was sitting on the lot. After a week it didn't go out, so I called the dealer and scheduled an appointment for today. After sitting at the dealership for 6 hours today, the technician comes to get me and explains that he tested the battery and it was good, however the connection to the battery was bad. He fixed the connection and reset the code. We went on a quick test drive around the block and the ESS system worked perfectly. I left the dealer and drive to work. 2 1/2 hours later I leave to pick up my kids, and the engine doesn't turn off at the 1st light, After a few red lights with the motor constantly running, I change the display to show the ESS status. I have a message showing the system is not ready because the battery is charging. After the 45 minute drive in traffic to my boys' school, I figured the battery must be charged by now. No luck. Now it looks like tomorrow I will be back at the dealership to see what the problem is again. I plan on leaving the car there until they figure it out. A car less than 2 weeks old should not have to be in for repairs already. I love the Compass, but if this can't be fixed, I will have to look for a replacement.

Sent from my SM-G935W8 using Tapatalk
When the idle stop system goes into the battery charging mode, it will remain there until the next time the vehicle is cycled off and on. So, that in of itself isn't abnormal, unless you had shut the vehicle off and restarted it at the end of that run someplace.
 
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