🔍

P04B0: Refueling Vapor Control Valve Circuit/Open

Severity
Low
System
Emission Controls
Last reviewed: Last updated:

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

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

Common Causes

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. 1
    Find your vehicle above

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

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

P0440 EVAP System P0441 EVAP System Incorrect Purge Flow P0442 EVAP System Leak Detected (small leak) P0443 EVAP System Purge Control Valve A Circuit P0444 EVAP System Purge Control Valve A Circuit Open P0445 EVAP System Purge Control Valve A Circuit Shorted P0446 EVAP System Vent Control Circuit P0447 EVAP System Vent Control Circuit Open