2021-2023 Hyundai Santa Fe ISG Auto Stop Eliminator | Memory Harness

Built for the 2021–2023 Hyundai Santa Fe, this ISG memory harness keeps ISG (Idle Stop & Go) in whatever state you left it. Press the button once, and the setting carries over to the next start. It connects at the ISG button circuit, between the switch and its factory plug.

The factory button stays in place and still works. Press it and the module stores the new choice. Unplug the module and the vehicle goes back to stock behavior.

Which Hyundai Santa Fe models it fits

Every row below is listed as a 100% fitment match for this part:

• Hyundai Santa Fe: 2021–2023

Trim levels are not split out in the table, so confirm that your vehicle has the stop-start button before ordering.

How ISG (Idle Stop & Go) behaves from the factory

On the Hyundai Santa Fe, ISG (Idle Stop & Go) shuts the engine down at a stop and fires it back up as the brake is released. You can switch it off with the dash button, but the choice is not saved. The next ignition cycle brings the default back. The module keeps the choice you made instead.

A note on the battery

The module draws its power from the vehicle and does not change charging behavior. If your Hyundai Santa Fe sits for long periods, the same rules apply as without it: a maintainer helps, and a battery that tests weak should be replaced with the type specified for stop-start vehicles (usually AGM or EFB).

What to expect

• It remembers the last stop-start setting through a key cycle.
• It does not write anything to the vehicle's modules, and removing it restores the stock default.
• It does not change engine power, transmission shifts, emissions calibration or fuel trims.
• It leaves the factory button working, so you can turn stop-start back on whenever you want.

Conditions the factory system checks

Even with ISG (Idle Stop & Go) enabled, the engine control logic only stops the engine when conditions allow it. Typical blockers are a low battery state of charge, an engine that has not reached operating temperature, heavy heating or A/C demand, steering input, an open door or unlatched seatbelt, and some drive modes. If the system never seems to stop the engine, one of these is usually the reason, and the module does not change that logic.

Installation and removal

It connects at the ISG button circuit, between the switch and its factory plug. Because it is plug-in only, removal is the reverse: unplug the module and reconnect the factory connectors directly. Keep the original clips and trim fasteners if you remove a panel to reach the connector.

Why owners turn it off

Pressing the same button on every drive is what wears on owners. People who tow, plow, idle in pickup lines, creep through heavy traffic or simply want the engine running at a light end up making the same press dozens of times a week. On the Hyundai Santa Fe, the module turns that into a one-time choice you can still change whenever you want.

Troubleshooting notes

A dead or weak battery, a charging problem or an unrelated module fault will change how ISG (Idle Stop & Go) behaves with or without this part installed. Scan the vehicle for stored codes, test the battery and confirm the system works normally with the factory button before installation. That baseline makes any later issue easy to pin down.

Check before you order

• Model year and model match a row in the table above (2021–2023 Hyundai Santa Fe).
• Your Hyundai Santa Fe has the factory stop-start button. Base trims or engines without stop-start have nothing for the module to remember.
• The battery and charging system test good and no warning lights are on.
• The connector at your install point matches the one in the product photos.
• No aftermarket remote start, alarm or gateway bypass is wired into the same circuit. If one is, email support before ordering.
• If you are unsure, send your VIN to support@automotivebypass.com and we will confirm fitment.

Ordering details

Free standard shipping covers the contiguous US, with dispatch in 1–2 business days and 3–4 days on the road after that. You have 45 days to request a return (pre-approval required, 20% restocking fee, buyer-paid return shipping). The module is backed by a 3-year limited warranty. For order or fitment questions, write to support@automotivebypass.com between 9 and 5 Pacific, Monday through Friday.