P04AB

What it means

The second EVAP purge control valve (B) - used on systems with a divided purge path or on twin-bank engines - shows an open control circuit. The ECU cannot drive the valve, so vapor cannot be purged through this stage; tank pressure may rise and emissions diagnostics fail.

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

• Open in harness or connector

  high

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

• Solenoid winding open

  medium

  A plausible cause — test and verify before replacing parts.

• Pin pushed back out of connector body

  low

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

Related help

• Full P04AB diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?