2021-2026 GMC Yukon XL Auto Start Stop Eliminator | Plug & Play

If your GMC Yukon XL turns Auto Stop/Start back on every time you start it, this plug-and-play memory harness solves that one problem: it remembers the last setting and restores it at the next ignition cycle. Coverage is the 2021–2026 GMC Yukon XL. It plugs in line with the factory connector named in the instructions, using factory-style plugs on both ends, so nothing is cut or spliced.

Nothing is reprogrammed in the engine computer. The module only stands in for the button press you would otherwise make after every start, and it comes out without leaving a trace.

Covered model years

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

• GMC Yukon XL: 2021–2026

The listing is written around the fifth-generation (2021-up) Yukon XL. Trim is not listed separately. Any trim in these years with factory stop-start and the pictured connector is covered.

Why the button resets

The factory logic arms Auto Stop/Start every time the engine starts. Turning it off with the button only lasts until the engine is shut down. Owners who sit in stop-and-go traffic, tow, or idle in drive-throughs often prefer it off, and that is where the repeated button press comes from.

Diagnostics first

If the setting is not remembered, check that the module was installed with the ignition off and that the connector clicked into place. Then press the factory button once, switch the vehicle off, close the doors, give the electronics time to shut down, and start again. If it still resets, contact support with the year, trim and a photo of 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 GMC Yukon XL, the module turns that into a one-time choice you can still change whenever you want.

Things that already block an auto stop

The factory system will skip an auto stop for many reasons: battery charge below its threshold, cold coolant, high climate-control load, a steep grade, the hood or driver door open, or a 4WD or tow mode on vehicles that have them. Those checks stay in control after this module is installed. It does not force stops and it does not bypass any of those safety inputs.

Keep the battery healthy

The module draws its power from the vehicle and does not change charging behavior. If your GMC Yukon XL 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

• Does not disable warning lights or diagnostic functions.
• Carries your stop-start choice over to the next drive.
• Comes out in the same way it went in, with nothing cut.
• Fuel use changes only the way it would if you pressed the off button yourself.

Installing the plug-and-play memory harness

It plugs in line with the factory connector named in the instructions, using factory-style plugs on both ends, so nothing is cut or spliced. 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.

Quick fitment check

• Model year and model match a row in the table above (2021–2026 GMC Yukon XL).
• Your GMC Yukon XL 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 and support

We ship free within the contiguous United States (1–2 business days to dispatch, roughly 3–4 business days in transit). If it turns out to be the wrong part, request a return authorization within 45 days; returns carry a 20% restocking fee and return postage is on the buyer. Coverage is a 3-year limited warranty. Questions go to support@automotivebypass.com, weekdays 9 a.m. to 5 p.m. PST.