EVAP System Purge Control Valve B Stuck Closed

Where it lives

For P04AF, the description names the valve as the part involved.

Check these first

• EVAP purge valve B stuck shut from debris or carbon
• A clogged vapor line feeding purge valve B
• A weak purge valve B coil that will not open it
• Corrosion at the purge valve B connector
• A blocked EVAP canister port behind valve B

What to do next

1. Command EVAP purge valve B open and listen for a click
2. Inspect purge valve B for debris holding it shut
3. Check the vapor lines and canister port for blockages
4. Test the purge valve B coil and connector
5. Replace EVAP purge valve B if it stays shut
6. Clear the code and retest

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