P22C8

What it means

Compressor outlet valve mechanically stuck open — boost pressure leaks back to intake before reaching the cylinders, causing under-boost.

Is it safe to drive?

This code points to a problem that can cause damage or affect safety. Avoid driving and have the vehicle diagnosed promptly.

Most likely causes

• Diaphragm torn or seat eroded

  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 P22C8 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?