P04AE — EVAP System Purge Control Valve B Performance/Stuck Open

What Does P04AE Mean?

P04AE is a diagnostic trouble code indicating: EVAP System Purge Control Valve B Performance/Stuck Open. This code relates to the emission controls system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P04AE

⚠️ Check Engine Light (MIL) illuminated
⚠️ EVAP System Purge Control Valve B not meeting expected output
⚠️ Degraded performance of related system
⚠️ Failed emissions test

Common Causes

🔍 EVAP System Purge Control Valve B degraded from age or contamination
🔍 Mechanical wear in EVAP System Purge Control Valve B or related parts
🔍 Restriction or blockage affecting EVAP System Purge Control Valve B
🔍 Calibration drift in EVAP System Purge Control Valve B

Frequently Asked Questions

What does P04AE mean?

P04AE indicates: EVAP System Purge Control Valve B Performance/Stuck Open. The vehicle's computer has detected that the EVAP System Purge Control Valve B is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P04AE?

Yes, P04AE is generally safe to drive with in the short term. However, it should still be addressed to pass emissions testing and prevent potential secondary issues.

How much does it cost to fix P04AE?

Repair costs for P04AE typically range from $50 to $400, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect EVAP System Purge Control Valve B for contamination or wear
🔧 Replace EVAP System Purge Control Valve B
🔧 Address any related mechanical faults

1
Find your vehicle above
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P04AE: EVAP System Purge Control Valve B Performance/Stuck Open