Engine "Start/Stop" - Jeep Compass Forum
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post #1 of 46 Old 04-18-2018, 10:16 PM Thread Starter
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Question Engine "Start/Stop"

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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post #2 of 46 Old 04-18-2018, 10:22 PM
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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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post #3 of 46 Old 04-19-2018, 09:21 AM Thread Starter
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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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post #4 of 46 Old 04-20-2018, 08:28 PM
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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
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post #5 of 46 Old 04-21-2018, 09:59 PM Thread Starter
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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
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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!
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post #6 of 46 Old 04-21-2018, 10:35 PM
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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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post #7 of 46 Old 04-22-2018, 05:44 PM Thread Starter
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Originally Posted by dawm View Post
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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post #8 of 46 Old 04-23-2018, 03:36 PM
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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!
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.
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post #9 of 46 Old 04-24-2018, 08:07 PM Thread Starter
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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.
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post #10 of 46 Old 05-07-2018, 12:14 AM
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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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post #11 of 46 Old 05-07-2018, 01:23 AM Thread Starter
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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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post #12 of 46 Old 05-12-2018, 04:22 AM
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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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post #13 of 46 Old 05-12-2018, 01:33 PM Thread Starter
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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.
Currently, it's predominately "city" driving
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post #14 of 46 Old 05-12-2018, 01:43 PM
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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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post #15 of 46 Old 05-16-2018, 04:20 PM
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Can you PM me? Are you able to take complaints?
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post #16 of 46 Old 05-18-2018, 09:35 PM
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my light came on a couple days ago too but it's gone after i shut down and started it back up.
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post #17 of 46 Old 06-04-2018, 10:57 PM
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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.

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post #18 of 46 Old 06-06-2018, 04:33 PM
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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.

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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.

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post #19 of 46 Old 06-14-2018, 02:52 PM
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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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post #20 of 46 Old 06-14-2018, 03:24 PM
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Originally Posted by Key Reign View Post
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.

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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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post #21 of 46 Old 12-11-2018, 11:21 AM
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Mine has been doing this lately when I use the remote start. I have to shut the vehicle off and restart it for the warning light to go off.

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post #22 of 46 Old 12-11-2018, 04:26 PM
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Mine has been doing this lately when I use the remote start. I have to shut the vehicle off and restart it for the warning light to go off.
Did it become colder? It happened to me 2-3 times when the car sat overnight below 15F. If it has become colder, it might be that. Most of the time A! indicates charge of the aux battery is low, especially if it goes away after you turn the car off and on. Cold doesn't play well with batteries as they discharge faster, recover slower after a discharge and the engine needs more power to start.

I assume it only happens during remote start because with remote start there is something like a 2-3 sec delay between it's initiation and car starting(since you need to press 2X). And if you look inside the car during remote start, most of the cabin electronics, tail lights and the day time lights turn on with the first press. I think these put a load on the cold aux battery and finally the engine cranking with the second press pull out even more juice from the battery. At the end, once the car turns on and makes a "systems" diagnosis, it misdiagnose the battery as poorly charged (since cold also makes recovery after discharge slower), since it makes this check moments after the engine cranking. To me a poorly implemented diagnosis procedure than an actual issue.

Last edited by Tripod; 12-11-2018 at 04:30 PM.
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post #23 of 46 Old 12-12-2018, 10:57 AM
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Did it become colder? It happened to me 2-3 times when the car sat overnight below 15F. If it has become colder, it might be that. Most of the time A! indicates charge of the aux battery is low, especially if it goes away after you turn the car off and on. Cold doesn't play well with batteries as they discharge faster, recover slower after a discharge and the engine needs more power to start.

I assume it only happens during remote start because with remote start there is something like a 2-3 sec delay between it's initiation and car starting(since you need to press 2X). And if you look inside the car during remote start, most of the cabin electronics, tail lights and the day time lights turn on with the first press. I think these put a load on the cold aux battery and finally the engine cranking with the second press pull out even more juice from the battery. At the end, once the car turns on and makes a "systems" diagnosis, it misdiagnose the battery as poorly charged (since cold also makes recovery after discharge slower), since it makes this check moments after the engine cranking. To me a poorly implemented diagnosis procedure than an actual issue.
It did it yesterday (it was 20 F when I remote started it) but this morning it didn't do it (20 F when I remote started it). And yes it did go away after I stopped/restarted the engine. Piss poor design if you ask me.

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post #24 of 46 Old 12-12-2018, 03:32 PM
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Mine has been doing this lately when I use the remote start. I have to shut the vehicle off and restart it for the warning light to go off.
Hi Redmaxx,

We're sorry to hear that you are experiencing this concern as well. Please let us know if you decide to take your Jeep to the dealer.

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post #25 of 46 Old 01-30-2019, 02:48 AM
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My "Start/Stop" feature has completely stopped working. It doesn't bother me too much because this is also my first vehicle that has this feature, however just the fact that something is not working like it's supposed is a little annoying. My plan was just to mention it the next time I'm in the dealership for an oil change.

I have had the issue with the "A" light coming on, but like someone mentioned here, I just turned the car off and back on again and it went away (this is my tech fix for anything...8 out of 10 times it works?)
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post #26 of 46 Old 01-30-2019, 11:01 AM
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Hi Redmaxx,

We're sorry to hear that you are experiencing this concern as well. Please let us know if you decide to take your Jeep to the dealer.

Darlene
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I'm curious if FCA tested a single system before installing it in their vehicles? Glitches like these SHOULD have been vetted out during the design phase of the cars, and should NEVER be beta tested by customers under the guise of it being a "finished" product.
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post #27 of 46 Old 01-31-2019, 10:46 AM
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Did it become colder? It happened to me 2-3 times when the car sat overnight below 15F. If it has become colder, it might be that. Most of the time A! indicates charge of the aux battery is low, especially if it goes away after you turn the car off and on. Cold doesn't play well with batteries as they discharge faster, recover slower after a discharge and the engine needs more power to start.

I assume it only happens during remote start because with remote start there is something like a 2-3 sec delay between it's initiation and car starting(since you need to press 2X). And if you look inside the car during remote start, most of the cabin electronics, tail lights and the day time lights turn on with the first press. I think these put a load on the cold aux battery and finally the engine cranking with the second press pull out even more juice from the battery. At the end, once the car turns on and makes a "systems" diagnosis, it misdiagnose the battery as poorly charged (since cold also makes recovery after discharge slower), since it makes this check moments after the engine cranking. To me a poorly implemented diagnosis procedure than an actual issue.
I don't think the cold weather has anything to do with it. It was -4 yesterday and -12 this morning and I didn't have this issue. I am sure I can add it to the list of things I have taken it in for and been told that there ar3e no codes and bring it in next time it does it.

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post #28 of 46 Old 02-06-2019, 03:02 AM
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I had to take mine in for this issue, after it triggered a check engine light when restarting at a red light. The dealership said it was a bad relay and replaced it. A few days later the malfunction light was right back on. Itís a constant issue that the dealership can not pinpoint to fix. I donít see an issue with outside temp with mine. It happens when hot and/or cold, though I am in GA and it doesnít get severely cold here.
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post #29 of 46 Old 02-06-2019, 03:30 AM
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I had to take mine in for this issue, after it triggered a check engine light when restarting at a red light. The dealership said it was a bad relay and replaced it. A few days later the malfunction light was right back on. Itís a constant issue that the dealership can not pinpoint to fix. I donít see an issue with outside temp with mine. It happens when hot and/or cold, though I am in GA and it doesnít get severely cold here.
Same issue with mine, waiting for a battery sensor, we'll see. I also have no remote start or 4wd option since the check engine light came on.
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post #30 of 46 Old 02-08-2019, 03:05 AM
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You need to stop for at least 7 seconds to make the on off feature fuel efficient.
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