P04B0 — Refueling Vapor Control Valve Circuit/Open

What Does P04B0 Mean?

P04B0 is a diagnostic trouble code indicating: Refueling Vapor Control Valve Circuit/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 P04B0

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic Refueling Vapor Control Valve readings
⚠️ Related system operating intermittently
⚠️ Failed emissions test

Common Causes

🔍 Wiring issue in Refueling Vapor Control Valve circuit (damaged, chafed, or corroded)
🔍 Faulty Refueling Vapor Control Valve connector or terminal
🔍 Failed Refueling Vapor Control Valve
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does P04B0 mean?

P04B0 indicates: Refueling Vapor Control Valve Circuit/Open. The vehicle's computer has detected that the Refueling Vapor Control Valve is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P04B0?

Yes, P04B0 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 P04B0?

Repair costs for P04B0 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 and repair Refueling Vapor Control Valve wiring and connectors
🔧 Replace faulty Refueling Vapor Control Valve

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.

P04B0: Refueling Vapor Control Valve Circuit/Open