2025-2026 Subaru Forester Auto Start Stop Eliminator | Gateway Memory Harness

A gateway memory harness for the 2025–2026 Subaru Forester. Out of the factory, Auto Start Stop comes back on at every key cycle. This module remembers your last choice and sends it again at the next start. It plugs in at the gateway module connector, between the factory plug and the module, so the stored setting is applied where the vehicle network passes the stop-start request.

You can still use the original button at any time. Whatever you select last is what the module repeats on the next start. Take the module out and the vehicle behaves exactly as it did from the factory.

Which Subaru Forester models it fits

Listed applications (each row is a 100% fitment match for the factory connector this part uses):

• Subaru Forester: 2025–2026

The table does not separate trims; what matters is that the vehicle has factory stop-start and the connector shown in the photos.

What the factory system does

Each start of the Subaru Forester begins with Auto Start Stop enabled. The switch on the dash can disable it, but only until the key is cycled. This module records the switch position and repeats it after the restart, which is the entire job it does.

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 Subaru Forester, the module turns that into a one-time choice you can still change whenever you want.

Battery notes for stop-start vehicles

The module draws its power from the vehicle and does not change charging behavior. If your Subaru Forester 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).

Before blaming the module

If a "stop-start unavailable" or similar message appears, check the battery first. A battery that tests weak, a recent battery replacement that was not registered where the manufacturer requires it, or a fault in the battery current sensor can all disable the system. Clear up those issues before judging how the module works, because it cannot hold a setting the vehicle refuses to accept.

If stop-start is not engaging

A Subaru Forester that rarely auto-stops is often telling you something about the battery. Stop-start vehicles usually run an AGM or EFB battery, and the system is one of the first features to drop out as that battery ages. Cabin temperature requests, engine temperature and brake pressure also factor in. None of these checks are altered by the module.

Connecting it

It plugs in at the gateway module connector, between the factory plug and the module, so the stored setting is applied where the vehicle network passes the stop-start request. 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.

What to expect

• Leaves engine and transmission software untouched.
• Holds the stop-start button state between drives.
• Lets you re-enable the system with the factory button at any time.
• Leaves no permanent change after removal.

Quick fitment check

• Model year and model match a row in the table above (2025–2026 Subaru Forester).
• Your Subaru Forester has the factory stop-start button. Base trims or engines without stop-start have nothing for the module to remember.
• No aftermarket remote start, alarm or gateway bypass is wired into the same circuit. If one is, email support before ordering.
• 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.
• If you are unsure, send your VIN to support@automotivebypass.com and we will confirm fitment.

Shipping, returns and warranty

Shipping is free to the contiguous US. Orders leave in 1–2 business days and usually arrive 3–4 business days later. Returns are accepted within 45 days with pre-approval; a 20% restocking fee applies and the buyer covers return shipping. The part carries a 3-year limited warranty, and support@automotivebypass.com answers Monday to Friday, 9–5 Pacific.