P1455 — Substantial Leak or Blockage in Evaporative Emission Control System

What Does P1455 Mean?

P1455 is a manufacturer-specific diagnostic trouble code: Substantial Leak or Blockage in Evaporative Emission Control System. This code applies to FORD, LINCOLN, MERCURY, OTHER, VOLKSWAGEN vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1455

⚠️ Check Engine Light (MIL) illuminated
⚠️ Substantial Leak or Blockage in Evaporative Emission Control System not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ Reduced engine performance

Common Causes

🔍 Faulty Substantial Leak or Blockage in Evaporative Emission Control System
🔍 Wiring or connector issue in Substantial Leak or Blockage in Evaporative Emission Control System circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does P1455 mean?

P1455 indicates: Substantial Leak or Blockage in Evaporative Emission Control System. The vehicle's computer has detected that the Substantial Leak or Blockage in Evaporative Emission Control System is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1455?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1455 for extended periods may cause additional problems.

How much does it cost to fix P1455?

Repair costs for P1455 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 Substantial Leak or Blockage in Evaporative Emission Control System and related wiring
🔧 Replace faulty Substantial Leak or Blockage in Evaporative Emission Control System

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.

P1455: Substantial Leak or Blockage in Evaporative Emission Control System