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Doors and Access

What is a Push Button Start?

One press and the engine springs to life

STARTFob OKEngine

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.

A simple analogy

"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
Rough UK cost

£90 to £250 total

Parts: £50 to £150 for the button and control module
Labour: £40 to £100 for diagnosis and fitting

Always get a written quote. Prices vary by car, region, and parts brand.

Heads up: Carautonomy is for general guidance only. If your car is showing warning lights or behaving oddly, get it looked at by a qualified mechanic.

Keep exploring

Alternator
The on-board power station that keeps your battery topped up.
EGR Valve
A small valve that recycles exhaust gas to reduce emissions.
Starter Motor
The muscle that turns your engine over when you twist the key.

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A friendly note

Information here is general guidance, not a diagnosis. Always speak to a qualified mechanic before parting with cash.

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