You can instantly disable the Supra’s auto start‑stop by starting the engine and pressing the left‑dash encircled “A” Off button; this turns the system off for the current ignition cycle and a dashboard light confirms it. It resets when you shut off the car, so press it after each start if you want it off. Note that climate, drive mode, battery charge and incline can prevent engagement, and dealer coding is required for a permanent disable—more details follow.
Quick Answer: Disable Start‑Stop (Supra)
Locate the Off button to the left of the steering wheel, start the engine, and press it—this turns off Supra’s Auto Start‑Stop for the rest of the ignition cycle so the engine won’t shut off during stops. You’ll immediately free the car from repeated restarts, improving your driving experience and maintaining climate control or power on demand. The system stays disabled until you turn the ignition off; press the Off button again to re-enable it within the same cycle. Remember Auto Start‑Stop also won’t activate under MAX A/C, steep grades, or low battery, so it’s not the sole safety features control. If you need help or have questions, contact your Toyota dealer or support team for precise guidance.
Where the Encircled “A” Button Is
You’ll find the encircled “A” button on the dashboard to the left of the steering wheel as part of the left cluster. Pressing this button after starting the engine turns off Auto Start-Stop for that ignition cycle and lights the dashboard indicator. Look for the letter A inside a circle to identify the control quickly.
Button Location Overview
1 clear control you need sits on the left side of the steering wheel: the encircled “A” button that disables the Auto Start-Stop system. You’ll find it within easy reach, positioned for minimal distraction so you can reclaim control quickly. For button functionality, press it after starting the engine to turn Auto Start-Stop off; the Auto Start-Stop indicator light will illuminate to confirm the change. That setting stays off for the current ignition cycle and resets when you restart the vehicle. This placement enhances user experience by allowing you to act without shifting posture or focus from driving. Use the button whenever you want the system disengaged for smoother, uninterrupted operation and a more liberated driving feel.
Dashboard Left Cluster
When you glance at the left dashboard cluster, you’ll find the encircled “A” button tucked to the immediate left of the steering wheel within easy thumb reach; press it after starting the engine to disable Auto Start-Stop for the current ignition cycle, confirmed by the dashboard indicator light. You’ll use this simple control to assert your user preferences and regain control over dashboard functionality. Press once to deactivate; the system stays off until you shut the ignition. Remember it auto-reactivates on the next start unless you press again. Note that Auto Start-Stop may already stay inactive under certain conditions—like MAX air conditioning or steep inclines—so check the indicator before pressing. This lets you quickly enforce your driving choices.
Identifying The Symbol
Look for a small button marked with an encircled “A” on the left side of the steering wheel; pressing it after you start the engine will toggle the Auto Start-Stop system off for that ignition cycle and the dashboard indicator will light to confirm. You’ll spot the button design as a compact, tactile control integrated into the dash cluster near your left knee. Its symbol significance is direct: the encircled “A” denotes Auto Start-Stop control, so you won’t confuse it with other functions. Press once to deactivate for that drive; the illuminated dashboard light verifies your choice. Remember freedom is temporary here—the feature reverts to default on the next restart, so repeat the toggle whenever you want control.
Disable Start‑Stop : Step‑By‑Step
Start the engine, then press the Off button located to the left of the steering wheel to disable the Auto Start‑Stop for the current ignition cycle. You’ll interrupt the Auto Start Stop benefits that aim for efficiency so you can prioritize uninterrupted Engine performance and control. With the button pressed, the system won’t restart the engine during this drive, freeing you from unwanted stops while you command the road. Note conditions that also prevent engagement—MAX air conditioning or steep inclines already keep the system inactive. If you change your mind, press the Off button again during the same ignition cycle to toggle the feature back on. This method gives you straightforward, immediate liberation from automatic restarts without altering vehicle settings.
How Long It Stays Off and When It Resets
Once you press the Off button, the Auto Start‑Stop stays disabled for that entire ignition cycle, and it’ll come back to its default active state as soon as you restart the vehicle. You control the Auto Start Stop duration by pressing the Off button above the Sport button each time you start the Supra. The Resetting feature is automatic on restart; there’s no memory save between cycles. To keep it off, press Off after every ignition-on.
- Turn ignition on, press Off to disable.
- Drive freely; the system stays off until you shut down.
- Restart the engine; the feature resets to active.
- Press Off again to reclaim control.
This keeps procedure clear and gives you consistent, repeatable liberation from automatic restarts.
Why Start‑Stop Sometimes Won’t Engage
Don’t expect Start‑Stop to engage when the climate control is on MAX because the system prioritizes cabin cooling over engine shutoff. It also stays disabled under certain operating conditions—like steep inclines, Power or Snow mode, or when the steering isn’t centered—to preserve drivability and safety. Finally, low battery charge or high fluid temperatures will prevent Start‑Stop from operating until conditions return to acceptable ranges.
Climate Control Limits
Although the Supra’s Auto Start‑Stop saves fuel, it won’t engage when climate control demands are high—setting A/C to MAX forces the system to keep the engine running to maintain cabin comfort. You can use climate control settings strategically to influence whether Start‑Stop can activate, since the car prioritizes comfort prioritization over engine-off economy.
Reduce A/C intensity or switch off MAX when you want Start‑Stop available. Note other limits that act similarly and keep the system from engaging:
- Full blast A/C to fight heat keeps the engine alive.
- Heavy steering inputs or off‑center wheel block activation.
- Drive modes like Power or Snow disable Start‑Stop.
- Low battery or high fluid temps prevent reliable stops.
Act deliberately: change settings to reclaim control and fuel savings when safe.
Vehicle Operating Conditions
When driving, the Supra’s Auto Start‑Stop won’t activate under several operating conditions that prioritize control and system reliability: you’ll notice the system stays on when the A/C is at MAX because continuous engine operation is required to maintain cooling. It also won’t engage on steep inclines, since the engine must hold power to propel the car uphill. Selecting Power or Snow mode disables Auto Start‑Stop to prioritize engine performance for immediate throttle response or traction. If the steering wheel isn’t centered the feature won’t kick in, preserving steering control. Finally, the system will inhibit engagement when battery charge is low or fluid temperatures are high, favoring vehicle performance and safety. Know these driving conditions so you can choose when and how to override the system.
Battery And Temperature
Beyond driving modes and steering position, your Supra also monitors battery charge and fluid temperatures before deciding to cut the engine. You’ll see Start‑Stop refuse to engage when battery health is marginal or when temperature regulation demands continuous operation. That’s intentional—safety and reliability come first. To recognize common triggers, visualize these scenarios:
- AC set to MAX drawing full power, keeping the engine alive.
- Steep hill holding the car’s position, preventing a shutdown.
- Low battery charge flagged, disabling Start‑Stop to preserve restart ability.
- High coolant or transmission temperatures forcing the system to stay on.
If you want consistent disengagement, keep modes in your control: avoid MAX AC, don’t select Power or Snow, and monitor battery health and fluids regularly.
How Sport, Power & Traction Affect Start‑Stop
Because Sport and Power change how the Supra responds, they also affect when Auto Start‑Stop will engage: you’ll notice altered driving dynamics and clear performance benefits when you choose modes. Select Power mode and Auto Start‑Stop won’t engage, giving you uninterrupted throttle response for quicker launches and immediate control. Pick Sport and you get sharper throttle mapping and shift behavior, but traction control stays active — stability remains while you push performance. Remember Sport doesn’t stick as a default, so you’ll need to select it each start if you want that feel. Also note steering angle and climate settings can override stop‑start: if the wheel’s off‑center or A/C is on MAX, the system won’t cut the engine, preserving control and comfort.
Troubleshooting When the Button Won’t Work
If the Auto Start‑Stop button won’t respond, first confirm the engine’s fully started and the car’s on level ground—start‑stop only activates when the engine’s running and steep inclines can prevent engagement. Next, run quick checks to free yourself from guesswork: verify AC isn’t set to MAX, and that you haven’t selected Power or Snow mode, both of which disable the system. Use these troubleshooting tips to assess button functionality and regain control.
If the Auto Start‑Stop button stays unresponsive, confirm the engine’s running, car’s level, AC not on MAX, and drive mode isn’t Power or Snow.
- Engine idling on a flat driveway, key on, system looking for conditions.
- AC set below MAX, so the system can allow stop‑start.
- Drive mode set to Normal, not Power or Snow.
- Button pressed with the dash showing no error lights.
If unresponsive after this, consult your dealer.
Permanently Disabling Start‑Stop (Dealer Coding, Risks)
When you want the Auto Start‑Stop permanently turned off, expect the dealer to access your Supra’s ECU and apply coding changes that disable the feature at the software level. You’ll ask the dealer for dealer coding, confirm the steps, and authorize the ECU write. They’ll back up original settings and document the change.
| Step | Action |
|---|---|
| 1 | Request dealer coding and estimate |
| 2 | Authorize ECU access and backup |
| 3 | Confirm final test and documentation |
Know the risks: this can trigger warranty implications or unexpected behavior if done improperly. Consult a qualified technician, get written confirmation from the dealership about responsibilities, and weigh lost functionality against your desire for permanent control before proceeding.
When You Should Leave Start‑Stop Enabled
Although you can disable Auto Start‑Stop, you should leave it enabled during city commuting and heavy stop‑and‑go traffic because it cuts idle time, improves fuel economy, and lowers emissions without compromising basic comfort; you’ll conserve fuel efficiency and support emissions control while staying in command of your drive. Keep it active when conditions favor it: it preserves engine temperature, reduces wear from idling, and still works with low‑setting A/C.
- Stopped at lights: engine off, fuel saved.
- Traffic crawl: less idling, extended engine life.
- Short trips: cumulative fuel efficiency gains.
- Mild A/C use: comfort with economy.
Choose freedom through efficiency — use Start‑Stop selectively to maximize savings and minimize environmental impact.
Frequently Asked Questions
Does Bimmercode Work on 2026 Supra?
No, it isn’t confirmed; you shouldn’t assume Bimmercode features will work on 2026 Toyota Supra compatibility yet. You’ll monitor community reports, test cautiously if possible, and push for official updates to gain freedom.
Conclusion
You can usually turn off Supra’s start‑stop with the A button, but it resets each ignition cycle. If you want it permanently off, dealer coding can do it—though that may void warranties or affect emissions compliance. For example, a weekend track owner had a dealer disable start‑stop to avoid stalls between hot laps, gaining consistent throttle response but accepting potential warranty scrutiny. Use temporary off for daily comfort; consider coding only if you accept the risks.
