AutoCodes – MINI – P0455 MINI

P0455 MINI Code - Evaporative Emission Control System Leak Detected Gross Leak

Quick Answer

The Engine Control Module (ECM) tests the Evaporative Emission (EVAP) system for a large leak or restrictions to the purge path in the EVAP system. Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P0455 MINI indicates Evaporative Emission Control System Leak Detected Gross Leak.
Common causes: Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 393

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 25, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0455 MINI Description

The Engine Control Module (ECM) tests the Evaporative Emission (EVAP) system for a large leak or restrictions to the purge path in the EVAP system. When the enabling criteria has been met, the ECM commands the EVAP vent solenoid valve and purges the solenoid valve ON, allowing vacuum into the EVAP system. The ECM monitors the fuel tank pressure sensor voltage to verify that the system is able to reach a calibrated level of vacuum before a calibrated amount of purge volume has passed through the system. The Diagnostic Trouble Code (DTC) will be set when the EVAP system is not able to achieve or maintain a calibrated level of vacuum less than -2.74 kPa (-11 in H20) before a calibrated amount of purge volume has passed through the system.

OBDII Code P0455 MINI - Evaporative Emission Control System Leak Detected Gross Leak - AutoCodes.com — P0455 MINI Code - Evaporative Emission Control System Leak Detected Gross Leak

What does this mean?

What are the Possible Causes of the DTC P0455 MINI?

Missing or loose fuel cap
Incorrect fuel filler cap used
Fuel filler cap remains open or fails to close
Foreign matter caught in fuel filler cap
Leaking EVAP Canister
Leaking EVAP System Hose
Leaking Fuel Tank
Faulty Fuel Tank Pressure Sensor

How to Fix the DTC P0455 MINI?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The P0455 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). A loose fuel tank filler cap is the most common cause that will trigger the P0455 code.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0455 MINI code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0455 MINI code?

Need more information on how to fix the P0455 MINI code? Get Access to Factory Service Manuals

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0455 MINI Code

1. What does OBDII code P0455 in a MINI mean?

The OBDII code P0455 in a MINI indicates that the Evaporative Emission Control System has detected a gross leak.

2. What are the common symptoms of OBDII code P0455 in a MINI?

Common symptoms of OBDII code P0455 in a MINI may include the check engine light turning on, a strong fuel odor, and decreased fuel efficiency.

3. What are the possible causes of OBDII code P0455 in a MINI?

Possible causes of OBDII code P0455 in a MINI include a loose or damaged gas cap, a cracked or disconnected EVAP system hose, a faulty EVAP canister, or a leak in the EVAP system.

4. How serious is OBDII code P0455 in a MINI?

While OBDII code P0455 in a MINI may not cause immediate drivability issues, it can lead to increased emissions and decreased fuel efficiency if left unresolved.

5. How can I diagnose OBDII code P0455 in a MINI?

Diagnosing OBDII code P0455 in a MINI typically involves checking the gas cap for tightness, inspecting EVAP system hoses for damage, and using a smoke machine to detect leaks in the system.

6. What are some repair tips for OBDII code P0455 in a MINI?

Repair tips for OBDII code P0455 in a MINI may include tightening or replacing the gas cap, repairing or replacing damaged EVAP system components, and clearing the code with an OBDII scanner after repairs are made.

7. Can I drive my MINI with OBDII code P0455?

It is generally safe to drive your MINI with OBDII code P0455, but it is recommended to address the issue promptly to prevent potential long-term problems.

8. How much does it cost to fix OBDII code P0455 in a MINI?

The cost to fix OBDII code P0455 in a MINI can vary depending on the specific cause of the issue, but it may range from a simple gas cap replacement to more extensive EVAP system repairs.

9. How long does it take to repair OBDII code P0455 in a MINI?

The time needed to repair OBDII code P0455 in a MINI depends on the complexity of the issue, but simple fixes like tightening the gas cap can be done quickly, while more involved repairs may take longer.

10. Can OBDII code P0455 in a MINI come back after being fixed?

OBDII code P0455 in a MINI may return if the underlying issue is not fully resolved, so it is important to thoroughly diagnose and repair the cause of the leak to prevent the code from reoccurring.