Engine Start/Stop Button

Whenever the front door is opened, the Engine Start/Stop button will illuminate and will go off 30 seconds after the door is closed.

To turn the vehicle off in an emergency:

Press and hold the Engine Start/Stop button for more than two seconds OR Rapidly press and release the Engine Start/Stop button three times (within three seconds).

If the vehicle is still moving, you can restart the vehicle without depressing the brake pedal by pressing the Engine Start/Stop button with the gear in the N (Neutral) position.

NEVER press the Engine Start/Stop button while the vehicle is in motion except in an emergency. This will result in the vehicle turning off and loss of power assist for the steering and brake systems. This may lead to loss of directional control and braking function, which could cause an accident.
Before leaving the driver's seat, always make sure the gear is in the P (Park) position, set the parking brake, press the Engine Start/Stop button to the OFF position, and take the Smart Key with you. Unexpected vehicle movement may occur if these precautions are not followed.
NEVER reach through the steering wheel for the Engine Start/Stop button or any other control while the vehicle is in motion. The presence of your hand or arm in this area may cause a loss of vehicle control resulting in an accident.

Engine Stop/Start button positions- Vehicle with manual transmission

Button Position	Action	Notice
OFF	To turn off the engine, stop the vehicle and then press the Engine Start/Stop button. The steering wheel locks to protect the vehicle from theft. (if equipped)	If the steering wheel is not locked properly when you open the driver's door, the warning chime will sound.
ACC	Press the Engine Start/Stop button when the button is in the OFF position without depressing the clutch pedal. Electrical accessories are usable. The steering wheel unlocks.	If you leave the Engine Start/Stop button in the ACC position for more than one hour, the battery power will turn off automatically to prevent the battery from discharging. If the steering wheel doesn't unlock properly, the Engine Start/Stop button will not work. Press the Engine Start/Stop button while turning the steering wheel right and left to release tension.
ON	Press the Engine Start/Stop button while it is in the ACC position without depressing the clutch pedal. The warning lights can be checked before the engine is started.	Do not leave the Engine Start/Stop button in the ON position when the engine is not running to prevent the battery from discharging.
START	To start the engine, depress the clutch and brake pedals and press the Engine Start/Stop button with the shift lever in neutral.	If you press the Engine Start/Stop button without depressing the clutch pedal, the engine does not start and the Engine Start/Stop button changes as follows: OFF > ACC > ON > OFF

Engine Stop/Start button positions- Vehicle with automatic transmission / dual clutch transmission

Button Position	Action	Notes
OFF	To turn off the engine, press the Engine Start/Stop button with the vehicle shifted to P (Park). Note if the Engine Start/Stop button is pressed with the vehicle shifted to D (Drive) or R (Reverse), the gear will automatically shift to P (Park). If the Engine Start/Stop button is pressed with the gear shifted to N (Neutral), the Engine Start/Stop button will change to the ACC position. The steering wheel locks to protect the vehicle from theft.	If the steering wheel is not locked properly when you open the driver's door, the warning chime will sound.
ACC	Press the Engine Start/Stop button when the button is in the OFF position without depressing the brake pedal. Some of the electrical accessories are usable. The steering wheel unlocks.	If you leave the Engine Start/Stop button in the ACC position for more than one hour, the battery power will turn off automatically to prevent the battery from discharging. If the steering wheel doesn't unlock properly, the Engine Start/Stop button will not work. Press the Engine Start/Stop button while turning the steering wheel right and left to release.
ON	Press the Engine Start/Stop button while it is in the ACC position without depressing the brake pedal. The warning lights can be checked before the engine is started.	Do not leave the Engine Start/Stop button in the ON position when the engine is not running to prevent the battery from discharging.
START	To start the engine, depress the brake pedal and press the Engine Start/ Stop button with the gear shifted to the P (Park) or the N (Neutral) position. For your safety, start the engine with the gear shifted to the P (Park) position.	If you press the Engine Start/Stop button without depressing the brake pedal, the engine does not start and the Engine Start/Stop button changes as follows: OFF > ACC > ON > OFF or ACC

Starting the engine

Always wear appropriate shoes when operating your vehicle. Unsuitable shoes, such as high heels, ski boots, sandals, flipflops, etc., may interfere with your ability to use the brake and accelerator pedals.
Do not start the vehicle with the accelerator pedal depressed.

The vehicle can move which can lead to an accident.
Wait until the engine rpm is normal. The vehicle may suddenly move if the brake pedal is released when the rpm is high.

The vehicle will start by pressing the Engine Start/Stop button, only when the smart key is in the vehicle.
Even if the smart key is in the vehicle, and when it is far away from the driver, the engine may not start.
When the Engine Start/Stop button is in the ACC or ON position, if any door is open, the system checks for the smart key. When the smart key is not in the vehicle, the "j" indicator will blink and the warning 'Key not in vehicle' will come on. When all doors are closed, the chime will also sound for about 5 seconds. Keep the smart key in the vehicle.

Starting the gasoline engine

Vehicle with Manual transmission:

Always carry the smart key with you.
Make sure the parking brake is applied.
Make sure the shift lever is in N (Neutral).
Depress the clutch and brake pedals.
Press the Engine Start/Stop button.

If you press the ENGINE START/STOP button to the START position without depressing the brake pedal and clutch pedal, the engine will not start, and it will be displayed on the cluster as in the following pop-up.

2025 Hyundai Tucson instrument cluster display image. The screen displays the white text 'Press brake and clutch pedals to start engine' on a black background. This explains the procedure to start the engine for manual transmission vehicles.

When the shift lever is not placed in N (Neutral), the following popup will be displayed on the cluster.

2025 Hyundai Tucson instrument cluster message image. The screen displays the text 'Shift to neutral to Auto Start' in white on a black background. This explains the instruction to shift the gear to Neutral to restart the engine.

Vehicle with Automatic transmission/ Dual clutch transmission:

Always carry the smart key with you.
Make sure the parking brake is applied.
Make sure the gear is shifted to P (Park).
Depress the brake pedal.
Press the Engine Start/Stop button.

Do not wait for the engine to warm up while the vehicle remains stationary.

Start driving at moderate engine speeds. Steep accelerating and decelerating should be avoided.
Always start the vehicle with your foot on the brake pedal. Do not depress the accelerator while starting the vehicle. Do not race the engine while warming it up.

Starting the diesel engine

To start the diesel engine when the engine is cold, it has to be pre-heated and then it has to be warmed up, before starting to drive.

Vehicle with Manual transmission :

Always carry the smart key with you.
Make sure the parking brake is applied.
Make sure the shift lever is in neutral.
Depress the clutch and brake pedal.
Press the Engine Start/Stop button.
Continue depressing the brake pedal until the glow indicator light (s) goes out.
When the glow indicator light (s) goes out, the engine will start.

When the shift lever is not placed in N (Neutral), the following popup will be displayed on the cluster.

Vehicle with Automatic transmission/Dual clutch transmission :

Always carry the smart key with you.
Make sure the parking brake is applied.
Make sure the gear is shifted to P (Park).
Depress the brake pedal.
Press the Engine Start/Stop button.
Continue depressing the brake pedal until the glow indicator light (s) goes out.
When the glow indicator light (s) goes out, the engine will start.

If the Engine Start/Stop button is pressed while the engine is pre-heating, the engine may start.

Starting and stopping the engine with turbocharger intercooler

Do not race or accelerate the engine immediately after starting the engine. If the engine is cold, idle for several seconds before sufficient lubrication is ensured in the turbo charger unit.
After high speed or extended driving that requires heavy engine load, idle the engine about 1 minute before turning the engine off. This idle time will allow the turbocharger to cool prior to shutting the engine off.

Do not turn off the engine immediately after it has been subjected to a heavy load. Doing so may cause severe damage to the engine or turbo charger unit.

To prevent damage to the vehicle:

If the engine stalls while you are in motion, do not attempt to shift the gear to the P (Park) position.

If traffic and road conditions permit, you may put the gear in N (Neutral) while the vehicle is still moving and press the Engine Start/Stop button in an attempt to restart the engine.
Do not push or tow your vehicle to start the vehicle.

To prevent damage to the vehicle:

Do not press the Engine Start/Stop button for more than 10 seconds except when the stop light fuse is blown.

When the stop light fuse is blown, you cannot normally start the engine. Replace the fuse with a new one. If you are not able to replace the fuse, you can start the engine by pressing and holding the Engine Start/Stop button for 10 seconds with the Engine Start/Stop button in the ACC position.

For your safety always depress the brake pedal before starting the vehicle.

Emergency starting

2025 Hyundai Tucson smart key emergency start image. A smart key fob is positioned to press the Engine Start/Stop button on the dashboard. Explains the method to start the engine by pushing the button with the smart key when the key battery is weak.

If the smart key battery is weak or the smart key does not work correctly, you can start the vehicle by pressing the Engine Start/Stop button with the smart key in the direction of the picture above.

Turning off the engine

Stop the vehicle and depress the brake pedal fully.
Make sure the gear is shifted to P (Park).
Press the Engine Start/Stop button to the OFF position and apply the parking brake.

Remote start

You can start the vehicle using the Remote Start button of the smart key.

To start the vehicle remotely:

Press the door lock button within 10 m (32 feet) from the vehicle.
Press the remote start (Ĕ) button for over 2 seconds within 4 seconds after locking the doors.
To turn off the remote start function, press the remote start (Ĕ) button once.

The remote start (Ĕ) button may not operate if the smart key is not within 10 m (32 feet).
The vehicle will not remotely start if the engine hood or tailgate is opened.
The vehicle must be in P (Park) for the remote start function to start.
The engine turns off if you get in the vehicle without a registered smart key.
The engine turns off if you do not get in the vehicle within 10 minutes after remotely starting the vehicle.
Do not idle the engine for a long period.