Every time you start your Audi Q5, the auto start/stop system turns itself back on. You press the button to disable it, drive comfortably, shut the engine off, and then the next morning you’re doing it all over again. It’s one of those small annoyances that adds up fast, especially if you find the constant engine cycling rough on your nerves or hard on your starter.
There are a couple of ways to deal with this, ranging from a simple button press every morning to a plug-and-play module that handles it automatically. This guide covers both options, plus what’s actually going on behind the scenes so you know exactly what you’re working with.
Why the Auto Start/Stop System Keeps Turning Back On
Audi’s auto start/stop feature is designed to reduce fuel consumption and lower emissions during city driving. The system shuts the engine off when you’re stopped at a red light and restarts it when you lift off the brake. Audi calls it the “engine start/stop” function, and it’s been standard equipment on Q5 models since the third generation launched for the 2018 model year.
Here’s the thing: the system is programmed to default to the “on” state every single time the ignition cycles. This isn’t a bug. Audi does this intentionally to meet fuel economy testing standards and stay compliant with emissions regulations in various markets. There’s no native setting buried in the MMI menu that lets you permanently disable it from the factory. The car simply resets the preference every time you turn the key.
This means pressing the A-off button on the center console works for that drive only. Come back tomorrow and you’re pressing it again.
Using the Factory Dashboard Button (The Manual Method)
If you only occasionally find the start/stop system annoying, the built-in button might be all you need. Here’s how it works on the 2018 to 2024 Q5:
- Start the vehicle and let it complete its normal startup sequence.
- Look for the button on the center console labeled with a circle and the letter “A” with a line through it. On most Q5 trims, it sits just below or near the drive select controls.
- Press the button once. You’ll see a small indicator light up on the button itself confirming the system is off.
- The system stays off for the rest of that drive.
There are some conditions where the system can override your preference even mid-drive. If the cabin temperature climbs high enough and the climate control needs extra engine power, or if the battery state of charge drops, the car may re-engage start/stop regardless of the button state. You’ll notice this if the system kicks back in on a hot day right after you’ve disabled it.
For most Q5 owners who drive every day, pressing this button gets old fast. If that sounds like you, the module solution below is worth a look.
The Permanent Fix: Start/Stop Eliminator Module
A start/stop eliminator module is a small plug-and-play device that connects to the OBD2 port under your dashboard. When you start the car, the module detects the ignition cycle and automatically sends the same signal as pressing the A-off button, but it does it every single time without you having to think about it.
No coding. No warranty-voiding modifications. No tools required. You just plug it in and it works.
Audi Q5 Start Stop Eliminator Module
A plug-and-play OBD2 module that automatically disables the auto start/stop system every time you start your Q5, so you never have to press the button again.
When shopping for one of these modules, make sure it’s specifically listed as compatible with your Q5 model year. The 2018 to 2024 Q5 uses the MLB Evo platform, and the OBD2 protocol used by these modules needs to match. Most reputable options on Amazon will list year-by-year compatibility in the product description. Double-check before you buy, especially if you have the Q5 Sportback or the SQ5 variant, as compatibility can vary.
How to Install the Module
- Turn off the vehicle completely.
- Locate the OBD2 port. On the Q5, it’s under the driver’s side dashboard, typically to the left of the steering column.
- Plug the eliminator module directly into the OBD2 port. It should click in firmly.
- Start the vehicle. Within a few seconds, the A-off indicator on your console should light up automatically.
Some modules have a small LED that confirms they’re active. Others are completely silent but functional. Either way, you should see the start/stop button light illuminate on the dash within about 5 to 10 seconds of startup.
Will This Affect Anything Else?
A quality eliminator module only mimics the button press. It doesn’t alter any engine parameters, transmission settings, or safety systems. You won’t see any check engine lights or fault codes, and the start/stop system itself remains fully intact. If you ever want to sell the car or take it to a dealer for warranty work, just unplug the module and the car behaves exactly as it did from the factory.
If you ever want to diagnose other issues separately, a good OBD2 scanner for DIY repairs can coexist in your toolkit alongside the eliminator. Some owners use a short OBD2 extension cable so both can stay connected, though that setup isn’t necessary for most people.
Model Year Notes for the Audi Q5
The auto start/stop system has been present on every Q5 since the second-generation model (2009 to 2017) and continued through the current third generation. Here’s a quick breakdown:
- 2009 to 2017 (Gen 2): Start/stop is present but the button behavior and OBD2 protocol differ from newer models. Some eliminators work on these years, but verify compatibility carefully.
- 2018 to 2024 (Gen 3): This is the most common platform for eliminator modules. Compatibility is generally well-documented and widely supported.
- 2025 and newer: The Q5 received a significant refresh. Module compatibility for 2025 and later models is still catching up, so check with sellers directly if you have a newer build date.
If you’re unsure of your model year or build date, check the sticker inside the driver’s door jamb. It lists the exact production date, which matters more than the model year when dealing with mid-cycle updates.
Frequently Asked Questions
Does disabling auto start/stop hurt the engine or battery?
There’s a common belief that leaving the engine running at idle is harder on it than the start/stop cycling. Modern Q5 engines use a reinforced starter motor and a heavy-duty absorbed glass mat (AGM) battery specifically designed for start/stop use. Turning it off doesn’t stress either component. If anything, some mechanics argue that repeated cold micro-starts create more wear over time than simply idling, though the difference is minimal on well-maintained vehicles.
Will using an eliminator module void my Audi warranty?
Almost certainly not, as long as you remove the module before any dealer visit where warranty work is being performed. Under the Magnuson-Moss Warranty Act, a dealer must prove that an aftermarket device caused the specific issue being claimed before they can void your warranty. A passive OBD2 module that only sends a button-press signal won’t show up in any diagnostic logs. Still, to keep things simple, just unplug it before service appointments.
Can I permanently disable auto start/stop through the MMI settings or software coding?
Not through the MMI touchscreen. Audi doesn’t offer a native setting to permanently disable the system. Some Audi enthusiasts use VCDS (VAG-COM Diagnostic System) coding to make the change at the software level, but this requires a licensed VCDS cable, technical knowledge of Audi’s control modules, and carries a small risk of introducing coding errors if done incorrectly. For most owners, the eliminator module is the more practical and reversible option. If you’re interested in deeper software-level customization, the process is similar in spirit to the kind of system-level tuning discussed in guides on Volkswagen Group driver assist features, since Audi and VW share the same platform architecture.
The Bottom Line
If you press the A-off button every morning and you’re tired of it, a start/stop eliminator module is the most practical fix for the Audi Q5. It takes about thirty seconds to install, it’s completely reversible, and it works every single time you start the car.
Audi Q5 Auto Start Stop Eliminator
Plug-and-play compatibility with 2018 to 2024 Q5 models makes this the easiest way to permanently keep the start/stop system off without any coding or tools.
Just make sure you buy one that lists your exact model year as compatible, especially if you have a 2025 or newer Q5. For anything older than 2018, double-check the protocol compatibility before purchasing. Beyond that, it’s one of the simplest upgrades you can make to improve your daily driving experience in the Q5.
If you’re already making small upgrades to your vehicle, it’s a good time to check that your car emergency kit is up to date as well. It’s easy to overlook until you actually need it.
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