What are the common causes of P04AE?

A purge valve B stuck open. Debris holding purge valve B open. A failed purge valve B solenoid. A fuel tank pressure sensor reading wrong.

Command purge valve B closed on a scan tool and watch fuel tank pressure. Remove purge valve B and check it for debris. Test the purge valve B solenoid. Replace purge valve B if it stays open. Clear the code and retest.

P04AE

EVAP System Purge Control Valve B Performance/Stuck Open

System: Auxiliary emission controls (P code)
Lamp: Check Engine Light
Category: Powertrain - Auxiliary Emissions Controls

What it means

P04AE means EVAP System Purge Control Valve B Performance/Stuck Open.

Where it lives

For P04AE, the description names the valve as the part involved.

Check these first

A purge valve B stuck open
Debris holding purge valve B open
A failed purge valve B solenoid
A fuel tank pressure sensor reading wrong

What to do next

Command purge valve B closed on a scan tool and watch fuel tank pressure
Remove purge valve B and check it for debris
Test the purge valve B solenoid
Replace purge valve B if it stays open
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.