What is a Push Button Start?
One press and the engine springs to life
Simplified animation — not to scale.
In plain English
Push button start replaces the traditional metal key and ignition barrel with a button on the dashboard or centre console. As long as the key fob is inside the car, pressing the brake pedal and the start button fires up the engine.
"It is like the ignition switch on a modern microwave. Instead of turning a dial, you press a button and the machine starts. The microwave checks the door is shut first; your car checks the key is inside and your foot is on the brake."
How it works
The system relies on the same wireless key fob detection as keyless entry. Interior antennas around the cabin confirm the fob is present. When you press the brake and the start button, the control module checks three things: the fob is authenticated, the brake is pressed, and the transmission is in park or neutral. If all conditions pass, the module closes a relay that supplies power to the starter motor, cranking the engine. To stop, you simply press the button again.
Signs of trouble
- ⚠Button not responding when pressed
- ⚠Engine cranking but not starting
- ⚠System saying "key not detected" even with the fob in the car
- ⚠Car starting without the brake pedal being pressed
- ⚠Engine continuing to run after the button is pressed to stop
£90 to £250 total
Always get a written quote. Prices vary by car, region, and parts brand.