If you drive a Kia Soul with the auto start/stop feature, you already know the routine. You pull up to a red light, the engine cuts out, and then there’s that slight shudder and hesitation when it fires back up. Some drivers don’t mind it. Many do. And every single time you start your car, the system defaults back to on, no matter how many times you’ve pressed that button to turn it off.
This guide covers exactly how to disable auto start/stop on the Kia Soul, why you can’t make it stick through the factory button alone, and what your options are for a permanent fix. We’ll also break down which model years are affected and what to look for in a plug-and-play eliminator module that solves the problem for good.
What Is Auto Start/Stop and Why Does It Reset Every Time?
Kia’s auto start/stop system is called ISG, which stands for Idle Stop and Go. It’s designed to cut the engine whenever the car comes to a complete stop and restart it when you release the brake. The goal is to reduce fuel consumption and emissions during city driving.
The problem is that Kia programs the ISG system to default to active every time you turn the ignition on. There’s a physical button on the dashboard (usually labeled “A Off” with a circular arrow) that lets you disable it for the current drive, but that preference doesn’t save. The moment you shut the car off and restart it, ISG is back on automatically.
This isn’t a bug. It’s intentional. Automakers include the default-on behavior to meet average fuel economy standards across a fleet. Your individual preference doesn’t factor into that equation. Kia doesn’t offer a menu setting, a dealer option, or a software toggle to change this default permanently on most Soul trims.
Which Kia Soul Model Years Have Auto Start/Stop?
The ISG system was introduced on the third-generation Kia Soul, which started with the 2020 model year. If you’re driving a 2019 or older Soul, you don’t have ISG and this article doesn’t apply to you.
Here’s a quick breakdown by year:
- 2014 to 2019: No ISG system. Auto start/stop is not present.
- 2020 to present: ISG is standard on most trims equipped with the 2.0L naturally aspirated engine and the IVT (Intelligent Variable Transmission).
The turbocharged Soul GT-Line and the EV variant have different powertrain configurations, so always confirm ISG is present on your specific trim before purchasing any eliminator module. The easiest way to confirm is to look for the “A Off” button on your dashboard cluster.
Using the Factory Dashboard Button (Temporary Fix)
Before getting into the permanent solution, it helps to understand the factory method so you can use it while you’re sourcing a module.
- Start your Kia Soul and let it complete its startup routine.
- Locate the ISG off button on the center dash or instrument cluster. It typically shows a circular arrow with the letter “A” in the middle and a line through it.
- Press the button once. An indicator light or dashboard message will confirm ISG is disabled.
- ISG will remain off for the rest of that drive.
- The next time you start the car, you’ll need to press it again.
That’s the extent of the factory solution. It works, but if you forget to press it or you let someone else use the car, the engine will start cycling off and on again. For daily drivers who want a set-it-and-forget-it fix, the button alone won’t cut it.
If you ever notice rough idling or engine behavior that seems unusual after a start/stop event, it may be worth pulling your codes with a quality scan tool. Our guide to the best OBD2 scanners for DIY auto repair has solid options at every price point.
The Permanent Fix: ISG Eliminator Module
An ISG eliminator is a small plug-and-play device that connects to your car’s OBD2 port or to a specific connector in the engine bay or under the dash. It intercepts the ISG signal and tells the system to remain disabled on every startup, automatically. You install it once and never think about it again.
For the Kia Soul, the most common style is an OBD2 port module that you plug in and configure once using a short button sequence or a paired app. After that initial setup, it runs silently in the background every time you drive.
Kia Soul ISG Start Stop Eliminator
A plug-and-play ISG eliminator designed for the Kia Soul that permanently disables the auto start/stop system without any wiring or tools required.
When shopping for an eliminator, look for one that specifically lists compatibility with your Soul’s model year and engine variant. Generic “universal” modules sometimes have inconsistent results on Kia’s ISG system. A model-specific unit that lists the 2020 or newer Soul with the IVT transmission is your safest bet.
Installation takes about two minutes in most cases. You plug the module into the OBD2 port (located under the driver’s side dash), follow the included setup steps, and you’re done. No tools, no wiring, no dealer visit.
Will Disabling ISG Hurt Your Car?
This is one of the most common concerns people have, and it’s worth addressing directly. Disabling ISG does not damage your engine or transmission. In fact, many mechanics argue the opposite. The start/stop cycle puts repetitive load on the starter motor, battery, and engine components at low oil pressure moments. Eliminating those extra cycles reduces wear over time.
Your fuel economy will take a small hit in stop-and-go city traffic, since that’s what ISG is designed to offset. On highway driving, the difference is negligible. For most drivers, the tradeoff is completely worth it.
Kia’s ISG system is similar in concept to the idle stop features you’ll find on other modern vehicles. If you’re curious how Kia stacks up against other brands in terms of driver-assist and safety tech, our breakdown of wireless Android Auto on the Kia Telluride gives a good sense of where the brand’s tech is headed. And if rough idle behavior is part of your concern, a related issue affecting other brands is covered well in our article on Acura MDX vibration at idle in drive, which walks through common causes and fixes.
Frequently Asked Questions
Does the ISG eliminator module work with Kia’s warranty?
Kia’s warranty covers defects in materials and workmanship. Simply plugging an OBD2 device into your port doesn’t void the warranty on its own. However, if Kia can demonstrate that a specific modification caused a specific failure, they could deny that repair. For most owners, an ISG eliminator lives in a gray area rather than a clear violation. That said, if you’re still under a bumper-to-bumper warranty and you have concerns, it’s worth asking your dealer before installing anything.
Can a dealership permanently disable ISG for me?
On the Kia Soul, there’s no known dealer-level software calibration that permanently disables ISG as a default setting. Some dealers may claim otherwise or suggest it’s possible through a reflash, but this is not a standard Kia service procedure. The eliminator module is currently the most reliable and reversible option available to Soul owners.
Will the ISG eliminator affect my check engine light or other warning lights?
A quality, Soul-compatible ISG eliminator should not trigger check engine lights or other warning indicators. The module works by simulating the driver’s input to disable the system rather than cutting or altering sensor signals. If you do see a warning light after installation, unplugging the module is all it takes to return the car to stock condition so you can diagnose the cause. Having a reliable OBD2 scanner on hand makes it easy to check for codes and rule out unrelated issues.
Bottom Line
The factory ISG button on the Kia Soul works fine as a one-drive fix, but it’s genuinely frustrating that Kia doesn’t give you a way to save that preference. An ISG eliminator module solves the problem completely, takes about two minutes to install, and doesn’t require you to touch a wire or open a single panel.
If you drive a 2020 or newer Kia Soul and you’ve been pressing that “A Off” button at every cold start, a plug-and-play eliminator is the most practical upgrade you can make. Check current pricing and compatibility on Amazon before buying to confirm it lists your specific year and transmission.
Kia Soul Auto Start Stop Eliminator Module
Permanently keeps ISG disabled on every drive without any wiring, making it the simplest fix for Kia Soul owners tired of pressing the button every morning.
While you’re improving your daily driving experience, it’s also worth thinking about what you keep in the car. A well-stocked car emergency kit is the kind of thing you only think about when you need it, and it’s much better to have it ready ahead of time.
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