My Jeep Compass Forum banner

61 - 80 of 98 Posts

·
Super Moderator
Joined
·
1,664 Posts
Months like November are always tricky in terms of type of gasoline. At least summer gasoline is still "usable" in winter accept for the first few minutes of starting.

Same thing once happened to me on a direct injection diesel engine. Unlike gasoline, diesel freeze (to be more precise turn into slush or gel-like) at ~15 F, winter diesel has additives to prevent that. Normally, gas stations are required to sell diesel with freezing point around 6 degrees below the mean historical minimum of that month (or maybe week).

However, in my case, I haven't been using that car often, so the summer diesel remained in the tank up until December. Then it fell below -15 F and diesel froze within the injectors, fule lining, etc. Couldn't start the car and we had to tow it to a closed heated garage.
Trouble is, extremes happen outside those predicted means. We had an issue around here maybe 20 years ago when the temps got seriously cold and school was cancelled anywhere they had diesel busses. Big hassle for anyone who 'garaged' their diesel outside -- businesses, truck lines, etc. It made headlines locally.
 

·
Registered
Joined
·
141 Posts
I had mine in to have my problem troubleshooted. Mine was narrowed down to the battery state of charge sensor. It was stuck at 55% even with a fully charged battery. New one on order.
 

·
Registered
Joined
·
46 Posts
Personally, I don,t think the auto/stop feature saves an ounce of gas. And there should be a way to turn it off permanently.
It doesn't save gas. This government mandated feature was designed to save gas but, instead of saving gas, the feature cuts down on emissions.
 

·
Registered
Joined
·
398 Posts
It doesn't save gas. This government mandated feature was designed to save gas but, instead of saving gas, the feature cuts down on emissions.
It saves gas lol. When engine isnt running, it is not using gas. Longer you stop, more gas it saves. Saving emission is equal to saving gas, where do you think emission is coming from?
 

·
Registered
Joined
·
173 Posts
It saves gas lol. When engine isnt running, it is not using gas. Longer you stop, more gas it saves. Saving emission is equal to saving gas, where do you think emission is coming from?
Might save "some" gas but it will be negated when you have to buy a new starter after it goes beyond its duty cycle in 2-4 years and a new aux battery. The feature is more of an annoyance than a saver couple with the fact that if you don't like the feature you have to push a button each and every time you do an ignition cycle. In my compass, it was broke more than it was operational so it didn't save me anything. If it did save anything it was negated by having to drive to the dealer for constant "repair" which was in the tune of a flash or a new battery. I'm willing to bet FCA spent more in warranty repairs trying to keep it working than I would have saved in the life time of the vehicle in gas.
 

·
Registered
Joined
·
398 Posts
Might save "some" gas but it will be negated when you have to buy a new starter after it goes beyond its duty cycle in 2-4 years and a new aux battery. The feature is more of an annoyance than a saver couple with the fact that if you don't like the feature you have to push a button each and every time you do an ignition cycle. In my compass, it was broke more than it was operational so it didn't save me anything. If it did save anything it was negated by having to drive to the dealer for constant "repair" which was in the tune of a flash or a new battery. I'm willing to bet FCA spent more in warranty repairs trying to keep it working than I would have saved in the life time of the vehicle in gas.
The starter doesn't have a duty life of 2-4 years. They are not using regular starters for auto start stop, they use starters specifically designed for this task.Therefore it should last as long as a regular starter last. There are bunch of research done on this. Auto start stop is not a new technology with lost of unknowns. A Volvo I rented at Sweden at 2010 has auto start stop.

https://www.greencarreports.com/news/1109687_dont-start-stop-systems-wear-out-your-cars-starter


Any influence the auto start stop has on the main battery is probably neglected by the fact that it reduces the demand of auxiliaries on the main battery and therefore extend the life of the main battery (it is the reason why there are two smaller batteries instead of one big battery). And if we have to talk about wear. Stopping the engine also reduced the wear on breaks, torque converted, transmission and the CV joints, or in general every part that wants to move and every part that keep them from moving, since these parts experience the load of the idling engine during stops unless you put the car to N every time you stop.

Issues with the system is another story. I for once never head any issues with it and considering there are probably 500-600k FCA vehicles just in the US with this system, I doubt it has a major unreliability issues. Compass and Renegade alone made more than 550k sales (Compass made 170k sales just in 2018) and the system is also present in other FCA cars with 2.4 engine.

Jeep Compass US car sales figures

Jeep Renegade US car sales figures
 

·
Registered
Joined
·
49 Posts
Let me know when your's battery sensor comes in, mines been on order for a few weeks and was told yesterday it's on back order and have no idea when it's coming in, and I'm driving around with a check engine light, no remote start or 4wd.
 

·
Registered
Joined
·
141 Posts
Let me know when your's battery sensor comes in, mines been on order for a few weeks and was told yesterday it's on back order and have no idea when it's coming in, and I'm driving around with a check engine light, no remote start or 4wd.
They stated about a week. We'll see. I'm back in permanent "battery charging" mode. Mine was only throwing random "service stop start system" messages intermittently. Sounds like there's going to be a bit more on yours if you're getting into the remote start and 4WD systems. Mine are completely unaffected, just the start stop system doesn't become active like it should.
 

·
Registered
Joined
·
49 Posts
The check engine came on after they changed my auxiliary battery. According to the service manager the code throwing the engine light is the battery sensor, and the check engine light causes the remote start and 4wd to not be enabled. We'll see I hear it will be a few weeks.

What ever Happened to ( Jeep Cares),lol. I haven't seen them on any posts in awhile!
 

·
Registered
Joined
·
471 Posts
The check engine came on after they changed my auxiliary battery. According to the service manager the code throwing the engine light is the battery sensor, and the check engine light causes the remote start and 4wd to not be enabled. We'll see I hear it will be a few weeks.

What ever Happened to ( Jeep Cares),lol. I haven't seen them on any posts in awhile!
Hey there Johnadam,
We're still here! Please send us a private message and will gladly see if there's anything we can do on our end to speed the delivery process up for you.
Lydia
Jeep Social Care Specialist
 

·
Registered
Joined
·
38 Posts
Ive had issues with my 2018 trailhawk stop/start. I always forgot to deactivate the "feature" when i take off, only to remember while getting to my first stop and since i HATE when the car turns off when i stop, i try to push the button before the stop/start kicks in. Normally if you push the button after the car turns off, the car just start right up, BUTTTT, guess what happens when you push the button at the same time the car is shutting down? It glitches and wont let you start the engine for like 30 mins, it happened to me 2 times, once it was in a safe place, the last time and what led me to remove the hood pin to disable the system as in the middle of the road at a red light. The car just sits there for 30 min aprox until it goes to power save, all electronics inside on, radio, ac blower, all on but if you try to start the car, it wont to anything. I went ahead and put the parking brake on (big mistake), the e brake engaged fine, but guess what? i couldn't take it off, so i couldn't even push the car out of the way. Since i was scared for my life in the middle of a red light, i just popped the hood and tried disconnecting the batteries, i pulled like 3 battery cables, and the damned thing was still on. after 30 min of me trying to get the thing to turn off or the engine on and with all those battery cables disconnected, defeated by the mighty 2nd gen compass, i sat in the driver side and i see some message that its going on energy or battery saver and only then it let me turn it off, when i see that it turned the electronics off, i rush outside to connect all the cables i disconnected, connected them and my nightmare ended. So i now have the stop/start icon in my DIC but thats a small price to pay.
 

·
Registered
Joined
·
49 Posts
I was told today from my dealer they have no idea when my battery sensor will come in, that's crazy/ You make a car and can't supply the parts for it. Meanwhile I'm told to drive a car around that has no 4wd, remote start etc. Never heard back from Jeep cares, guess they don't.
 

·
Registered
Joined
·
141 Posts
Let me know when your's battery sensor comes in, mines been on order for a few weeks and was told yesterday it's on back order and have no idea when it's coming in, and I'm driving around with a check engine light, no remote start or 4wd.
The dealership called me yesterday. The sensor is in, and I get it replaced this weekend.
 

·
Registered
Joined
·
141 Posts
I was told they have no idea when mine is coming in. They still are waiting for a few ordered in late December.
Hopefully this will mean that what is presumably a redesigned part will start arriving at your dealership soon. I'd have them needle the supplier to see what the status is on those backordered parts.
 

·
Registered
Joined
·
2 Posts
My brand new 2019 Compass has only 771 miles and the check engine light has been coming on 6 times and when I take it to the dealer, no codes show up. The problem is that when the check engine light comes on, the car will not start and I have to wait 5-10 minutes before it will finally start. Was told to make sure the auto stop/start is off each time I drive the car. Anyone had this issue?
 

·
Registered
Joined
·
1,358 Posts
Tripod said:
It saves gas lol. When engine isnt running, it is not using gas. Longer you stop, more gas it saves.
I had dug into this at some point in the past, can't remember if I posted my findings here or in another thread or not. But anyways, for what its worth, my rough math says that you have to know the engine will STAY shut down for at LEAST 10 seconds before any fuel can be considered to be "saved". That is to say, the amount of fuel it takes to restart the engine is roughly the same amount as about 8-10 seconds worth of idling. Like I said, this was rough math and its from a while ago so I cannot "show my work", but that is the figure I stuck into the back of my brain as a conclusion: (to keep it simple for myself) If I am coming to a stop and I am pretty sure I willl remain stopped for more than 10 seconds, then I will reach down and turn ESS back on for this one event. When I am visiting the biggest nearby town I know what lights or railroad crossings these events are likely to be. When I am doing my normal work-and-back run, that scenario (holding still for 10+ seconds) absolutely NEVER happens.

Even in the rare cases the scenario does happen, if I turn ESS on half the time it restarts right away for one of its million reasons to do so. Not to mention, its winter about half the year here and no crazy person is going to turn off the primary heat generator (the engine) to save a droplet of fuel. We need to keep our heat and defrost going just about all the time in the winter here.

So like we've said in the past, there are some people who are in a daily position to MAYBE take advantage of the system, but there are also some people like me for whom it is virtually NEVER beneficial in the slightest due to the way my daily drives are. If you saw on the other thread, I ordered the OBDLink MX and adapter cables, purchasing AlfaOBD app soon, and if that option in the app works to permanently disable the ESS system... I am going for it, 100%.

PR325xi said:
Normally if you push the button after the car turns off, the car just start right up, BUTTTT, guess what happens when you push the button at the same time the car is shutting down? It glitches and wont let you start the engine for like 30 mins, it happened to me 2 times
And THAT ^^^ is a big part of the reason why. I have not had that particular glitch, but I have had similar glitches occur when racing the computer for something such as re-starting the car after hopping in it and killing it by trying to put it in gear before hitting the start button (remote start had engine already running, too much on my brain at the time).

I hope hope hope the ESS kill on the AlfaOBD app works. If so I am going to be saved a lot of future embarrassment. It is pure lameness when the ESS kicks in. Passengers ask me worriedly "what happened? why did the car die??" and I have to tell them its on purpose...

Its just not a smooth, well implemented system and I get no benefit from it whatsoever, and throw on top of that the risk of running into something like what happened to PR325xi... hell no. One way or another, that component of this car has got to go (for me).
 

·
Registered
Joined
·
398 Posts
the amount of fuel it takes to restart the engine is roughly the same amount as about 8-10 seconds worth of idling.
I dont think restarting a warmed up engine would take gas equivalent to 8-10 seconds of idling. That would probably be correct for a cold engine, since the engine will run rich after starting, but a warmed up engine should not use any extra gas for starting.

You can even see that during a cold startup vs. startup of auto start stop. During cold start up, RPM jumps to 2500 quickly drops to ~2000rpm and idles there until engine heats up to some extend. During ESS, it directly goes to normal idling rate around 900rpm. And how ESS start the engine is even different for a warmed up engine. If you manually turn a warmed engine off and restart it, RPM still goes to ~1500 momentary and quickly drops to 900RPM, ESS never has any RPM jumps during engine startups, which makes me think it doesn't inject any extra fuel. That is probably the reason why is is very sensitive to external conditions, since it tries to start the engine without running it rich, or throttling it up, everything need to be ideal for the engine to catch cycle. If it senses restarting the engine would require more gas, it just shuts off the system.
 

·
Registered
Joined
·
1,358 Posts
It probably has been built to be as clever in that way as possible. Still, I can't stand the loud starter and the dimming/pulsing of the headlights and tailights during cranking. That just seems sloppy to me. If the system was smooth and subtle like it was in other older vehicles I've owned, that would be one thing. The way it works in this car, I'll never miss it a bit. My commute with my old car was different as well, I lived somewhere a person could actually take advantage of lengthy periods of not moving. Not so anymore, today I get on the highway and roll hard for 10 minutes straight, then I turn, and then I'm pretty much parked at work.
 

·
Registered
Joined
·
49 Posts
ok, auxillary battery number 4 installed today , the previous 3 all failed, what are they buying? ESS works for a few days then back to always battery charging.
 
61 - 80 of 98 Posts
Top