P04AB — EVAP System Purge Control Valve B Circuit/Open

What Does P04AB Mean?

P04AB is a diagnostic trouble code indicating: EVAP System Purge Control Valve B 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 P04AB

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic EVAP System Purge Control Valve B readings
⚠️ Related system operating intermittently
⚠️ Failed emissions test

Common Causes

🔍 Wiring issue in EVAP System Purge Control Valve B circuit (damaged, chafed, or corroded)
🔍 Faulty EVAP System Purge Control Valve B connector or terminal
🔍 Failed EVAP System Purge Control Valve B
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does P04AB mean?

P04AB indicates: EVAP System Purge Control Valve B Circuit/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 P04AB?

Yes, P04AB 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 P04AB?

Repair costs for P04AB 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 EVAP System Purge Control Valve B wiring and connectors
🔧 Replace faulty EVAP System Purge Control Valve B

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.

P04AB: EVAP System Purge Control Valve B Circuit/Open