2016-2018 Chevrolet Impala Auto Start Stop Eliminator

Built for the 2016–2018 Chevrolet Impala, this inline memory harness keeps Auto Stop/Start in whatever state you left it. Press the button once, and the setting carries over to the next start. It plugs in line with the factory connector named in the instructions. Both ends are factory-style plugs, so nothing is cut or spliced.

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.

Vehicles and years covered

This part is listed for these vehicles, all marked 100% fitment match:

• Chevrolet Impala: 2016–2018

For reference, the Chevrolet Impala in these years is a full-size sedan offered with 2.5L four-cylinder and 3.6L V6 engines, most of the driving it sees is daily commuting, ride-share duty and highway travel. The listing is written around the tenth-generation (2014-2020) Impala. Trim levels are not split out in the table, so confirm that your vehicle has the stop-start button before ordering.

What the factory system does

Each start of the Chevrolet Impala begins with Auto Stop/Start 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.

Battery and charging

If the stop-start indicator shows the system as unavailable, test the battery before anything else. On stop-start vehicles that is the most common cause. A replacement should match the original specification (AGM or EFB), and some manufacturers call for a battery monitor reset after the swap.

When the engine will not auto-stop anyway

Auto stop needs several conditions at once: a warm engine, enough battery charge, moderate cabin heating or cooling demand, and the vehicle fully stopped with the brake held. If any is missing, the engine keeps running. The module only remembers the button state; the factory controller still decides whether a stop is allowed.

Installing the inline memory harness

It plugs in line with the factory connector named in the instructions. Both ends are factory-style plugs, so nothing is cut or spliced. The instructions show the connector for this application; compare it with the product photos before starting. Turn the vehicle off, make the connection, fix the module in place, and test with two or three key cycles.

If something does not look right

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.

Typical reasons to keep it off

Stop-start saves the most fuel in long idles, but plenty of drivers would rather keep the engine running. Common reasons: towing or hauling, where an engine restart under load is unwelcome; drive-thru lines and parking lots, where the engine cycles on and off every few feet; hot days, when the A/C compressor stops with the engine on many vehicles; and stop-and-go traffic where the restart delay is noticeable when pulling into a gap. On a full-size sedan, any of these can mean a button press at the start of nearly every drive.

What changes after installation

• No tune, no reflash, no change to horsepower or shift points.
• Keeps the original switch fully functional.
• Stores the stop-start choice you made last and repeats it at the next start.
• Fully reversible: unplug it and the vehicle returns to factory behavior.

Quick fitment check

• Model year and model match a row in the table above (2016–2018 Chevrolet Impala).
• Your Chevrolet Impala 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.

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.