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Discussion Starter · #1 ·
There is a thread on this topic regarding the Auto Start/Stop in the Santa Fe News, Concepts & Rumor Discussion. Since we now have a 2019+ Santa Fe Forum, I'll start this same topic here. For reference, here is the original post in the News, Concepts and Rumor Discussion.
Https://www.santafeforums.com/2019-santa-fe-auto-engine-stop-start-t14097.html I'm new to this forum and there are restrictions on posting as a new member. I've tried to post regarding the Auto Stop/Start multiple times so if you happen to see more than one post, guess the moderator finally approved one of the other posts.

The Auto Stop/Start feature (Idle Stop/Go or ISG) is one that I suspect will generate a great deal of emotion from various drivers. Some really like it, some really don't like it. I'm not here to argue whether or not this is a good or bad idea, rather the intent is to share information amongst the forum members.

Personally, I'm in the camp of "I don't like it" and wish I could default the feature to not be active every time the car is started. I don't like having to push the ISG button upon startup. I also have a Ford F150 with this feature, and it has been disabled on my F150 (there are about 8 documented ways to disable this feature on the F150). If anyone figures out how to default this to be disenabled upon startup, or finds a way to bypass this feature, I'd be interested... Please share. And just to be clear, I'm for a way to cleanly do this and not void warranty or have to rewire the car so to speak, or hack the car up. Hope that makes sense.

Anyway, in the original post on this topic, there was mention that it is hard to know if/when the ISG will actually engage as it does not always engage at every stop. While I don't have too many details on all the criteria necessary for the Santa Fe, since I have a Ford F150, their user manual is pretty explicit about the criteria and parameters necessary for this feature to engage on those vehicles. While it is not specific to the Santa Fe, it is probably similar. So, I'll provide the details from the F150 just as a reference and to give some idea of why the Auto Stop/Start may or may not engage at a given time. See attached file: F150AutoStopStart.pdf
 

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There is a thread on this topic regarding the Auto Start/Stop in the Santa Fe News, Concepts & Rumor Discussion. Since we now have a 2019+ Santa Fe Forum, I'll start this same topic here. For reference, here is the original post in the News, Concepts and Rumor Discussion.
Https://www.santafeforums.com/2019-santa-fe-auto-engine-stop-start-t14097.html I'm new to this forum and there are restrictions on posting as a new member. I've tried to post regarding the Auto Stop/Start multiple times so if you happen to see more than one post, guess the moderator finally approved one of the other posts.

The Auto Stop/Start feature (Idle Stop/Go or ISG) is one that I suspect will generate a great deal of emotion from various drivers. Some really like it, some really don't like it. I'm not here to argue whether or not this is a good or bad idea, rather the intent is to share information amongst the forum members.

Personally, I'm in the camp of "I don't like it" and wish I could default the feature to not be active every time the car is started. I don't like having to push the ISG button upon startup. I also have a Ford F150 with this feature, and it has been disabled on my F150 (there are about 8 documented ways to disable this feature on the F150). If anyone figures out how to default this to be disenabled upon startup, or finds a way to bypass this feature, I'd be interested... Please share. And just to be clear, I'm for a way to cleanly do this and not void warranty or have to rewire the car so to speak, or hack the car up. Hope that makes sense.

Anyway, in the original post on this topic, there was mention that it is hard to know if/when the ISG will actually engage as it does not always engage at every stop. While I don't have too many details on all the criteria necessary for the Santa Fe, since I have a Ford F150, their user manual is pretty explicit about the criteria and parameters necessary for this feature to engage on those vehicles. While it is not specific to the Santa Fe, it is probably similar. So, I'll provide the details from the F150 just as a reference and to give some idea of why the Auto Stop/Start may or may not engage at a given time. See attached file: F150AutoStopStart.pdf
You can see I responded to your url link back on the other thread Oct 24 when my 2019 SF was BRAND NEW. After 2 mons & mostly in town 1050 miles this ISG has kicked in a fair amount, although it's unpredictable especially in winter when even after driving a few miles the ISG's off & little circled A is still orange. There are long stop lights where I'm fine with it kicking in and saving a few cents worth of gas, but not a fan when it stops by my mail box or entering the garage. It's much smoother than a Chevy Malibu rental that I had in FL last winter.

I really think this and having large 4 cylinder engines (including all mfrs having turbo 4's vs small V6s w/much simpler maintenance) is due to the USGov forcing these fuel efficiencies standards. Subaru Outback and Jeep Cherokees can be ordered with a 6 and RAV4 is only a straight 4 (or hybrid) but all the other compact/mid size popular CUVs seem to have a turbo 4. So we save a few gals of gas each year with ISG but need more frequent batteries and starters?
 

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I really think this and having large 4 cylinder engines (including all mfrs having turbo 4's vs small V6s w/much simpler maintenance) is due to the USGov forcing these fuel efficiencies standards. Subaru Outback and Jeep Cherokees can be ordered with a 6 and RAV4 is only a straight 4 (or hybrid) but all the other compact/mid size popular CUVs seem to have a turbo 4. So we save a few gals of gas each year with ISG but need more frequent batteries and starters?

FYI: Subaru’s use CVT’s as their transmission. They are much more fuel efficient, but there’s been recalls on them, so I don’t consider them reliable. I know, I Own One!
If there is a repair needed on a Subaru cvt, out of warranty, you’re looking at a $7-10,000 CDN repair bill ! That is a hard pill to swallow.

They’ve done this recall in such a way that it doesn’t show up on car reviews, so it looks like they are more reliable than they actually are.
A straight 6 or 8 sp tranny, from another manufacturer, is much more reliable that Subaru’s cvt. Rant over.



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Dam!! $7K to $10K repair bill for a transmission that is 5+ year old car.. double dam!.. might as well just buy a new car...


FYI: Subaru’s use CVT’s as their transmission. They are much more fuel efficient, but there’s been recalls on them, so I don’t consider them reliable. I know, I Own One!
If there is a repair needed on a Subaru cvt, out of warranty, you’re looking at a $7-10,000 CDN repair bill ! That is a hard pill to swallow.

They’ve done this recall in such a way that it doesn’t show up on car reviews, so it looks like they are more reliable than they actually are.
A straight 6 or 8 sp tranny, from another manufacturer, is much more reliable that Subaru’s cvt. Rant over.



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Just replaced my 2015 Forester XT with a 2019 SF. The Forester received a new CVT under warranty last week and my son now drives it. The car has 179,000 kms on it and I am quite comfortable that it will serve him well. Was impressed that Subaru honoured the warranty given the kms on it.
 

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Just replaced my 2015 Forester XT with a 2019 SF. The Forester received a new CVT under warranty last week and my son now drives it. The car has 179,000 kms on it and I am quite comfortable that it will serve him well. Was impressed that Subaru honoured the warranty given the kms on it.


Had the cvt replaced on the Forester at 135 K. Now at over 140k. Warranty runs out at 160K. I am then on my own.
The Warranty should go from the time the new tranny is put in, and then expire xxx km afterwards, Not at 160.
It’s Subaru’s problem - they should be responsible and fix in case of a 2nd failure.
Anyway, that’s why I’m now looking at a Santa Fe.

Please let me know how it compares to the Forester.


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Probably the only feature that I do not like, and I hate the fact that I can not permanently turn it off. Hyundai sent me a satisfaction survey, and while overall we love the new Santa Fe, I roasted them on this feature.
 

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T3M ECM ESG service campaign improve ISG???

Time for some activity in this forum/thread.

I had the T3M ECM ESG service campaign update at my dealer 10 days ago on my 2019 SF Limited AWD 2.4L. I received this email a while back Hyundai Motor America is conducting a Service Campaign to update the ECM & ESC on certain 2019 model year Santa Fe 2.4L vehicles. Service Campaign T3M provides a service procedure to update the ECM & ESC software.

Since applying this fix my ISG seems to work even less than before. Strange, since ISG is just "ok" to me when the car shuts off at a 2 min stop light but not ok when stopping at my mailbox or trying to park or enter my garage.

There are rumours this ECM fix may also eliminate some engine "sloppy starts" (ie, it starts but runs rough, or trys to start and won't then starts ok 2nd try).

Anybody after getting this T3M applied notice anything better (or worse)?
 

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Found this Tech Service Bulletin related to ISG and battery. Interesting that it was issued in Mar 2019.

Cut off last couple pages related to hooking up the diagnostic tool. Saw online it may be a $3k+ device so figured it wasn't needed. And it got the file size below 500 KB for upload.
 

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Discussion Starter · #11 ·
Probably the only feature that I do not like, and I hate the fact that I can not permanently turn it off. Hyundai sent me a satisfaction survey, and while overall we love the new Santa Fe, I roasted them on this feature.
Just FYI... there are some ways to default ISG to OFF (inactive). Some methods are more involved than others. I've documented some of these in another forum. Of course, you can review and see if any method appeals to you and your needs. Hope you find what you need.

Since the Forum will not allow me to post the entire URL here, you will have to put all these pieces together to "build" the URL. (take out the spaces in the line below to create the full URL)


https:// www. hyundai-forums .com/threads/ options-to-manage-the-isg-idle-stop-and-go-function.658336/#post-5936672
 

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Engage the button and with the light on stick something like a thin piece of an old credit card in the crack. will always be off from then on.
 

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Discussion Starter · #13 ·
Here is another option from Shark Racing.....
https://sharkracing.com/isg-and-auto-hold-memory-module-various-applications/
This module will default the ISG to OFF. You must wire it into your vehicle (remove the center console top and splice it in). Their instructions splice into the main car harness, if you prefer you can splice into the short wire harness on the bottom of the console cover (message me if you are interested in this approach). This module can also default the Auto Hold to ON if desired. Shark Racing also has a module to remember your heated/cooled seat settings, as well as a module to lock/unlock doors upon approach. Hope you can find something that works for your needs..... :grin
 

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I’ve got a 2019 Santa Fe. There is a button down by the shifter than turns the idle stop and go off and it says off even through restarts until you push the button again.


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Here is another option from Shark Racing.....
https://sharkracing.com/isg-and-auto-hold-memory-module-various-applications/
This module will default the ISG to OFF. You must wire it into your vehicle (remove the center console top and splice it in). Their instructions splice into the main car harness, if you prefer you can splice into the short wire harness on the bottom of the console cover (message me if you are interested in this approach). This module can also default the Auto Hold to ON if desired. Shark Racing also has a module to remember your heated/cooled seat settings, as well as a module to lock/unlock doors upon approach. Hope you can find something that works for your needs..... :grin

No need to do all that.
Just grab a toothpick and during the event where the Start-Stop is engaged to the on-position, jam a toothpick into the side of the switch. Then break-off the excess.


I've take my Hyundai and Kia vehicles to dealer for service 3-4 times and no objections from the Service Department, on my side-stepping procedure.
 

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Discussion Starter · #16 ·
No need to do all that.
Just grab a toothpick and during the event where the Start-Stop is engaged to the on-position, jam a toothpick into the side of the switch. Then break-off the excess.


I've take my Hyundai and Kia vehicles to dealer for service 3-4 times and no objections from the Service Department, on my side-stepping procedure.
The point is there are multiple options and people can choose the option that fits their needs. The key is to understand how each options works, and its potential side effects. For me, I chose to purchase and create a custom plug and play harness that lets me plug into the existing harness (so it can be easily removed if wanted and no residual effects). And after looking at the electrical diagram, this button grounds out a lead in the ECM (Engine Control Module) with a 200ohm resistor. I'm not an electrical engineer, and one has to assume they used a resistor that will handle a constant grounding when a toothpick is wedged in there. Who knows.... It was not a risk I was willing to take, so I chose a different solution. If someone is handy with some wires and basic electrical skills, you can build your own relay and TR-7 device that will simulate a user pressing the button right after the vehicle is started. Less than $30. It's really not that hard to do. And if you do that, you can also default the Auto Hold to ON. Users should be able to pick and choose what works best for their needs/desires. I'm not promoting one solution over another, just sharing various methods to work around this feature (which I don't like and seems like many others don't like either). And I'm not here to argue whether this feature is good or bad, some like it, some don't. If you like it, use it. If you don't like it, there are ways to get around it. Good luck to all and choose what works for your particular needs.
 

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The point is there are multiple options and people can choose the option that fits their needs. The key is to understand how each options works, and its potential side effects. For me, I chose to purchase and create a custom plug and play harness that lets me plug into the existing harness (so it can be easily removed if wanted and no residual effects). And after looking at the electrical diagram, this button grounds out a lead in the ECM (Engine Control Module) with a 200ohm resistor. I'm not an electrical engineer, and one has to assume they used a resistor that will handle a constant grounding when a toothpick is wedged in there. Who knows.... It was not a risk I was willing to take, so I chose a different solution. If someone is handy with some wires and basic electrical skills, you can build your own relay and TR-7 device that will simulate a user pressing the button right after the vehicle is started. Less than $30. It's really not that hard to do. And if you do that, you can also default the Auto Hold to ON. Users should be able to pick and choose what works best for their needs/desires. I'm not promoting one solution over another, just sharing various methods to work around this feature (which I don't like and seems like many others don't like either). And I'm not here to argue whether this feature is good or bad, some like it, some don't. If you like it, use it. If you don't like it, there are ways to get around it. Good luck to all and choose what works for your particular needs.
Will Hyundai / dealership void your warranty changing the electrical component chemistry? Have you inquired about that?
 

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Discussion Starter · #18 ·
Will Hyundai / dealership void your warranty changing the electrical component chemistry? Have you inquired about that?
That is a great question. In theory, they have to prove your change or alteration caused the issue. What if you put on different tires, add a dash cam, or make any other modification??? Or what if they know you jammed a toothpick/credit card into the ISG button? What's worse?? In real life, if they even recognize any alteration (which I doubt they will), and they deny you warranty, then you have a fight on your hands and that would really suck. I have not seen this happen or heard of others complaining about it (but I cannot guarantee it cannot or won't happen) I've had my vehicle in for normal services (recalls, service campaigns and oil changes) and nobody has noticed or said anything. In my case, my solution is completely plug and play, so easily removed. As well, the solution is not modifying the design, it is simply automating the user pushing the button. (the TR-7 is a timer, the relay isolates the ISG circuit so there is no unexpected or altered voltage in the ISC circuit) And if one were to install the TR-7/relay/resistor or the Shark Racing module by tapping into the existing wires, I'd recommend using the small wire harness under the console cover, that short harness is only about $100 to replace, and easily replaceable and accessible. Unfortunately, Shark Racing instructions tell you how to tap into the main interior harness (which is about $1300 and goes throughout the entire interior). It is imperative to understand the modification you are making, and understanding the potential risks associated with that change. Ultimately, you are responsible for any alteration you make regardless of where you find the information. You are asking the right questions!



I purchased the entire manual for the car (including electrical diagrams), purchased a spare switch (so it could be tested, etc), purchased an o-scope to validate the type of current, etc. before I made the modification to my vehicle. I spent many hours reviewing the electrical diagrams, and searching for the male/female connectors so my solution would be plug and play. Then, I had to build the custom harness. One could simply tap into the existing wires instead of building a custom harness... I'm comfortable with what I've done, but what I've done is not for everyone. I'm just sharing so others know there are choices.
If you want to know more, DM me. I'll share what I've found, and then you can decide if the risk is worth the benefit.

I've also done this same modification to my 2016 F150 to disable the auto start/stop feature. It's been in for normal service and warranty service and no issues or concerns with the dealer. As I said, I'm comfortable with the changes I've made, and I understand the risk and willing to take it. I just don't like my vehicle engine stopping when I come to a stop (maybe I'm just old school) But, it is not for everyone...... Good luck and continue to ask questions until you understand, and you either decide it is worth it, or not worth it.
 

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The only negatives to the Start-Stop feature are premature wearing of the button and premature wearing out of the starter.


Wait - there is a third negative and it drives my wife nuts.
Sometimes a light jerking takes place when the engine shuts off at a red light. I've felt that numerous times also.
The feature was designed as another means for manufacturers to reach the CAFE MPG Mandates of the US Government. Every 0.5% increase in gas mileage becomes important for borderline reachers like the Hyundai / Kia group.


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This will be my last post at this website. I hate it when I ask administration a PM question and they don't answer.
See Ya'
 
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