Table of Contents
Introduction
Every vehicle has a set of Diagnostic Trouble Codes (DTCs) that are generated by the vehicle’s computer when there is a problem with any of its parts. The P0455 code is triggered when the powertrain control module (PCM) observes a large gasoline vapor leak or absence of purge flow in the evaporative emission (EVAP) control system of the car. This article will explain the symptoms, causes, and how to fix the P0455 code.
What Does the P0455 Code Mean?
The P0455 code warns that the powertrain control module of the vehicle has detected a large fuel leak in the EVAP control system.
The evaporation system of the car helps to prevent fuel vapors from mixing with the outside atmosphere. Modern automobiles have an integrated evaporative emission system to collect the typical evaporation of the fuel vapors. These vapors are then collected in an EVAP canister before being returned to the engine’s intake through a purge valve and hoses.
The engine vacuum is passed through the canister to purge solenoids to move air into the canister. The collected fuel vapors in the intake manifold are transferred towards the combustion chamber as part of the fuel-air mixture.
The trouble code P0455 acts as a leakage indicator, indicating a leak within the EVAP system. This leak is identified by abnormal pressure sensor readings, which are then read by the PCM. The system generates a P0455 code as a result of the fluctuating readings, and the check engine light illuminates.
Symptoms of the P0455 Code
Trouble code P0455 is entirely emissions-related; hence, the vehicle will not display any further symptoms other than the illumination of a check engine light.
Some common symptoms of the P0455 code include:
- A strong odor of gasoline fuel at the filling or tank region.
- The odor may potentially go from the evaporative pipes to the engine intake system.
- Check engine light illumination.
Causes of the P0455 Code
- The most prevalent causes of the P0455 trouble code include:
- The gas cap is lost, open, or poorly fastened.
- Cracks, leaks, or breaks in EVAP hoses.
- The EVAP vent solenoid is broken or jammed open.
- Faulty or cracked charcoal EVAP canister.
- A gas cap that is faulty or defective.
- System pressure sensor failure.
- Fault in gas tank fuel filler neck.
- EVAP purge valve failure.
- Fuel tank crack.
- Fault in PCM.
- Vent valve solenoid failure.
How to Fix the P0455 Code
The P0455 code is an indication of a large leak in the vehicle’s evaporative emission control system (EVAP).
This can be caused by a number of factors, but some common solutions include checking the gas cap to ensure it is tight and not damaged, inspecting the EVAP system hoses and connections for leaks or damage, and checking the EVAP system purge valve and solenoid for proper operation.
Additionally, it is important to inspect the charcoal canister for damage or clogging, as well as the vacuum lines and hoses for leaks or damage.
If all of these checks have been done and the issue persists, it may be necessary to consult a professional mechanic for further diagnosis and repair. It is also recommended to refer to the vehicle’s service manual for specific instructions and troubleshooting related to the EVAP system