P04B4 — Refueling Vapor Control Valve Stuck Closed

What Does P04B4 Mean?

P04B4 is a diagnostic trouble code indicating: Refueling Vapor Control Valve Stuck Closed. 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 P04B4

⚠️ Check Engine Light (MIL) illuminated
⚠️ Refueling Vapor Control Valve Stuck Closed not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ Failed emissions test

Common Causes

🔍 Faulty Refueling Vapor Control Valve Stuck Closed
🔍 Wiring or connector issue in Refueling Vapor Control Valve Stuck Closed circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does P04B4 mean?

P04B4 indicates: Refueling Vapor Control Valve Stuck Closed. The vehicle's computer has detected that the Refueling Vapor Control Valve Stuck Closed is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P04B4?

Yes, P04B4 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 P04B4?

Repair costs for P04B4 typically range from $80 to $300, 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 Refueling Vapor Control Valve Stuck Closed and related wiring
🔧 Replace faulty Refueling Vapor Control Valve Stuck Closed

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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.

P04B4: Refueling Vapor Control Valve Stuck Closed