You pull up to a red light, the engine shuts off, and when the light turns green the truck lurches back to life. You press the little button with the circled A to stop it. Next morning, it is back on. If that sounds familiar, here is why GM trucks do this, what the feature really saves you, and every way to turn it off for good.
Short answer: on GM trucks and SUVs the Auto Stop button only works until the next start. There is no permanent factory off setting on most trims. A plug in module like the FullForce 10 Speed turns auto start stop off automatically every time you start the truck, and keeps DFM off at the same time.
How auto start stop works on GM trucks
When you come to a stop with your foot on the brake, the computer shuts the engine off to save fuel at idle. Lift off the brake and it restarts. The control is a small switch on the dash or console with a circled letter A and a circular arrow, plus an indicator light.
The catch is that the switch is a one drive override. The feature is on by default and rearms every time the ignition is restarted, so you have to press the button again on every single drive.
What start stop really saves, in numbers
| Source | Test | Result |
|---|---|---|
| AAA (2014) | EPA city cycle, 3 vehicles, on vs off | 5% to 7% better fuel economy |
| EPA (older estimate) | Fleet estimate | About 4% to 5% |
| SAE study (2023) | Federal city test (FTP) | About 7.3% better |
| SAE study (2023) | New York City stop and go cycle | About 26.4% better |
The pattern is simple: the saving comes entirely from idle time. Heavy stop and go traffic saves the most. Highway and rural driving, where the engine almost never stops, saves close to nothing. Most truck owners who turn it off are making a conscious trade of a small amount of fuel at stoplights for a smoother, quieter drive.
Why owners turn it off
- The restart lurch. Pulling away from a light while the engine is still restarting feels hesitant, especially when merging or turning across traffic.
- Towing and hauling. With a trailer or a heavy load, owners want the engine running and ready the moment the light turns.
- Cabin comfort. With the engine off, the AC can warm up at long lights in summer.
- Restart cycles. Some owners simply prefer fewer starts on the starter and battery, even though GM designs these trucks with a heavier duty AGM battery for the job.
- The button. Remembering to press it on every drive gets old fast.
Battery note: start stop trucks use an AGM battery. Replacement AGM batteries often cost about $150 to $300 or more for the part alone, and newer GM vehicles may need the new battery registered to the vehicle so it charges correctly. Use the correct battery type if you ever replace it.
Every way to turn it off, compared
| Method | Permanent? | Install | Notes |
|---|---|---|---|
| Press the A button | No, resets every start | None | Free, but every drive |
| Settings menu | Only on some trims and software | None | Many trucks do not have this option |
| Dealer or tuner programming | Usually | Shop visit | Changes factory software |
| Dash switch eliminator | Yes | Often requires pulling the dash and radio apart | More invasive on 2022+ interiors |
| FullForce 10 Speed | Yes, off every start | Plugs into OBD2, under 2 minutes | Also keeps DFM off; unplug to go back to stock |
How the FullForce 10 Speed handles it
The FullForce 10 Speed plugs into the OBD2 port under the driver’s side dash. Every time you start the truck it turns auto start stop off for you, the same result as pressing the button, without you touching anything. The engine stays running at red lights, takeoffs are smooth, and the AC stays cold.
It also keeps Dynamic Fuel Management off, so the V8 runs on all 8 cylinders. It is the only 10 speed disabler that shuts off DFM and auto start stop from a single OBD2 plug. No splicing, no wiring at the computer, nothing to reprogram.
| Fits | Model years | Engines |
|---|---|---|
| Silverado 1500 and Sierra 1500 | 2022.5 to 2026 | 5.3L and 6.2L V8 |
| Tahoe, Suburban, Yukon, Yukon XL | 2021 to 2024 | 5.3L and 6.2L V8 |
Some 2021 to 2022 5.3L trucks built during the chip shortage (RPO code YK9 on the glovebox label) have no auto start stop or DFM from the factory. Use the fitment checker on the product page to confirm your truck.
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Frequently asked questions
Can you permanently turn off auto start stop on a Silverado?
Not from the factory button. GM’s Auto Stop button turns the feature off only until the next time you start the truck. To keep it off for good you need an aftermarket solution, such as a plug in OBD2 module like the FullForce 10 Speed, which switches it off automatically on every start.
Why does my auto stop button reset every time?
Start stop is on by default so the vehicle can be rated for fuel economy and emissions with the feature active. The button is a one drive override, so the system rearms on every new start.
How much fuel does auto start stop actually save?
It depends on how much you idle. AAA testing found 5 to 7 percent on a city cycle, older EPA estimates were about 4 to 5 percent, and a 2023 SAE study found roughly 7 percent on the federal city test and up to 26 percent in heavy stop and go New York City style traffic. On the highway the saving is close to zero.
Is it bad for the battery or starter?
GM designs start stop trucks with a heavier duty AGM battery and supporting hardware for repeated restarts, so it is not a defect. Many owners simply dislike the restart lurch and prefer fewer restart cycles. AGM replacement batteries typically cost more, often about $150 to $300 or more for the part, and newer GM trucks may need the battery registered to the vehicle after replacement.
Will turning off auto start stop void my warranty?
The FullForce 10 Speed does not tune or reprogram the factory computer and unplugs with no changes left behind. For specific warranty questions, check with your dealer.
Does the FullForce 10 Speed fit my truck?
It fits the 2022.5 to 2026 Silverado 1500 and Sierra 1500 and the 2021 to 2024 Tahoe, Suburban, Yukon and Yukon XL with the 5.3L or 6.2L V8. It also keeps DFM off at the same time.
Related reading: DFM disabler guide for the 10 speed trucks · AFM vs DFM explained
Sources and further reading
AAA tests reveal real world benefits of automatic stop start technology, AAA Newsroom
Have stop start systems been worth it, WardsAuto
Does automatic start stop actually improve fuel economy, Jalopnik
Auto stop start fuel consumption benefits, Oak Ridge National Laboratory
How to disable auto start stop on the Silverado and Sierra 1500, Euro Premium Parts
Why AGM batteries perform better in start stop vehicles
