P04C9

What it means

The open-request switch never registers an active state - either the contact stays open mechanically or the wiring is permanently broken. The driver cannot trigger door release.

Is it safe to drive?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.

Most likely causes

• Switch contact stuck open

  high

  One of the most commonly reported causes for this code — check this first.

• Carbon or debris buildup preventing free movement

  low

  Less common, but worth ruling out after the more likely causes.

• Component wear with age - mechanical play

  low

  Less common, but worth ruling out after the more likely causes.

Related help

• Full P04C9 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?