P050A

What it means

During the cold-start phase the ECU runs an elevated idle speed and a richer mixture to bring the catalyst above light-off temperature quickly. The cold-start idle does not behave as commanded - speed sags, hunts, or fails to come up. Possible causes are intake leaks active when cold, an IAC valve sticking, or implausible coolant temperature.

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

• Intake leak only when cold (gasket shrinks)

  high

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

• IAC valve sticking when cold

  medium

  A plausible cause — test and verify before replacing parts.

Related help

• Full P050A diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?