P0455 Large leak detected in evaporator system

P0455 – OBD-II Trouble Code Technical Description

Typical: Evaporative emission control system leak detected (no purge flow or large leak)

Chrysler: EVAP Large Leak Detection Conditions

Ford: EVAP leak detection conditions (no purge flow or large leak) GM (Chevrolet): EVAP leak detection conditions

Nissan: Evaporative canister purge (EVAP) system - large leak

What does the fault code mean P0455?

Code P0455 is a generic OBD-II transmission diagnostic code indicating a fuel vapor leak or lack of purge flow in the EVAP control system. The emission control system (EVAP) prevents fuel vapors from escaping from the gasoline system. Codes associated with this system include P0450, P0451, P0452, P0453, P0454, P0456, P0457, and P0458.

P0455 is often caused by a loose gas cap. Try tightening the gas cap and resetting the code. If the problem is not resolved, you can try resetting the code by disconnecting the battery for 30 minutes. However, if the P0455 code recurs, you should take it to a mechanic for further diagnosis.

This code is also related to other OBD-II codes such as P0450, P0451, P0452, P0453, P0456, P0457 and P0458.

Possible reasons

The P0455 code may indicate the following events:

1. Loose or improperly secured gas cap.
2. Using a non-original gas cap.
3. The gas cap remains open or does not close correctly.
4. A foreign object has entered the gas cap.
5. Leaking EVAP tank or fuel tank.
6. Leak in the EVAP system hose.

It is important to fix this problem as it can cause fuel vapors to leak, which can be dangerous and negatively impact your vehicle's performance.

What are the symptoms of a fault code? P0455?

You probably won't notice any changes in the car's handling. However, the following symptoms may occur:

1. The check engine light on the instrument panel will illuminate.
2. There may be a fuel smell inside the vehicle due to the release of fumes.
3. The check engine light or engine maintenance light will illuminate.
4. There may be a noticeable fuel odor caused by the release of fuel vapor.

How to diagnose a fault code P0455?

Often, clearing a P0455 OBD2 code is as simple as removing and reinstalling the gas cap, clearing any stored codes in the PCM or ECU, and then driving for the day. If the P0455 OBDII code reappears, consider the following steps:

1. Replacing the fuel tank cap.
2. Inspect the EVAP system for cuts or holes in tubes and hoses. If damage is found, replace the faulty components.
3. Approach the EVAP system and check for any fuel odor. Listen carefully for vacuum noise. If you notice anomalies that are not related to the EVAP system, correct them.

Sources: B. Longo. Other EVAP codes: P0440 – P0441 – P0442 – P0443 – P0444 – P0445 – P0446 – P0447 – P0448 – P0449 – P0452 – P0453 – P0456

Diagnostic errors

Errors when diagnosing P0455:

1. Ignoring the fuel tank cap: The first and most common mistake is to ignore the condition of the gas cap. An improperly sealed, leaking, or even missing cap could be the root cause of the P0455 code. Therefore, before carrying out more complex diagnostics, pay attention to this part and make sure that it is closed correctly.

Thus, proper diagnosis begins with basic steps, and ignoring the condition of the gas cap can lead to unnecessary costs and worsening of the problem.

How serious is the fault code? P0455?

Trouble code P0455 can be serious because it indicates a fuel vapor leak or other problem in the evaporative emission control (EVAP) system. Although it will likely not affect the immediate driving of the vehicle, long-term neglect of this problem may result in deterioration of the vehicle's environmental performance and increased fuel consumption. Therefore, it is important to diagnose and resolve this code as soon as possible.

What repair will help eliminate the code? P0455?

1. Reinstall the gas cap.
2. Clear recorded codes and test drive.
3. Check the EVAP system for leaks (cuts/holes) and repair or replace components if necessary.
4. Pay attention to the smell of fuel and vacuum noise in the EVAP system and eliminate the corresponding causes if found.

How to Fix P0455 Engine Code in 3 Minutes [2 DIY Methods / Only $4.61]

P0455 – Brand-specific information

Code P0455 identifies large or severe emissions control system (EVAP) leaks for various makes of vehicles:

1. ACURA – Large leak in EVAP system.
2. AUDI – Large leak in the EVAP system.
3. BUICK – Gross leak in the emission control system.
4. CADILLAC - Major leak in emission control system.
5. CHEVROLET – Gross leak in the emission control system.
6. CHRYSLER – Large leak in EVAP system.
7. DODGE – Large leak in EVAP system.
8. FORD – Gross leak in the emission control system.
9. GMC - Serious leak in emission control system.
10. HONDA – Large leak in the EVAP system.
11. HYUNDAI – Large leak in the vapor emission system.
12. INFINITI – Serious leak in EVAP control system.
13. ISUZU – Large leak in the EVAP system.
14. JEEP – Large leak in the EVAP system.
15. KIA – Leak in EVAP emissions system.
16. LEXUS – Pressure drop in the EVAP system.
17. MAZDA – Large leak in EVAP emissions system.
18. MERCEDES-BENZ – Major leak in the emission control system.
19. MITSUBISHI – Large leak in the EVAP system.
20. NISSAN – Gross leak in the EVAP control system.
21. PONTIAC - Gross leak in the emission control system.
22. SATURN – Gross leak in the emission control system.
23. SCION – Gross leak in the EVAP system.
24. TOYOTA – Serious leak in EVAP system.
25. VOLKSWAGEN – Large leak in the EVAP system.