P04EC — EVAP System Large Leak Detected - Fuel Tank Side

What Does P04EC Mean?

P04EC is a diagnostic trouble code indicating: EVAP System Large Leak Detected - Fuel Tank Side. 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 P04EC

⚠️ Check Engine Light (MIL) illuminated
⚠️ EVAP System Large Leak Detected - Fuel Tank Side not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ Failed emissions test

Common Causes

🔍 Faulty EVAP System Large Leak Detected - Fuel Tank Side
🔍 Wiring or connector issue in EVAP System Large Leak Detected - Fuel Tank Side circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does P04EC mean?

P04EC indicates: EVAP System Large Leak Detected - Fuel Tank Side. The vehicle's computer has detected that the EVAP System Large Leak Detected - Fuel Tank Side is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P04EC?

Yes, P04EC 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 P04EC?

Repair costs for P04EC 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 EVAP System Large Leak Detected - Fuel Tank Side and related wiring
🔧 Replace faulty EVAP System Large Leak Detected - Fuel Tank Side

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.

P04EC: EVAP System Large Leak Detected - Fuel Tank Side