Error Code P2405: What It Means & What To Do?

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Error code P2405 is an OBD code that usually set when the gas cap is loose or missing from the fuel tank. This triggers the powertrain control module as fuel fumes leaks from the tank into the atmosphere. Unburned droplets or raw fuel can contribute to smog and can affect breathing.Error code P2405 means a large leak has been detected in the fuel vapour or lack of purge flow in the vehicle’s EVAP (Evaporative Emission System) control system.

Error code P2405 flashes when the PCM detects a large leak problem in the EVAP system. Normally, the EVAP system is sealed tight, as its main purpose is to keep gasoline vapour from escaping the fuel tank to the atmosphere. Fuel vapours are sent to the charcoal canisters through the hoses for storage. When the engine starts a purge control, a purge valve will open, allowing the vacuum to drain off the fuel vapours to the engine.

What causes this problem with the Evaporative Emission System Leak Detection Pump Sense Circuit Low?

• Loose or improperly placed gas cap
• Use of incorrect gas cap (not factory or original brand)
• Leak or damage in EVAP system hose
• Fuel tank or EVAP canister leak
• Foreign object caught in the fuel filler cap
• Defective fuel tank that doesn’t fully seal gasket
• Damaged or split carbon canister

1. Diesel Particulate Filter - The diesel particulate filter acts as an important component in managing the particulate emission in the exhaust system. If the filter is damaged, it may lead to increased emissions and pollutants through the tailpipe. Thus, replace damaged filter now!
2. Engine Control Module - It is not always the components, but the ECM that can also be faulty. It can cause misinterpretation of correct data thus leading to wrong operational decisions which will affect the transmission and overall engine performance. Thus, replace faulty module and reprogram it now!
3. Diesel Exhaust Fluid Heater - If the diesel exhaust fluid heater is faulty, it will not be able to aid in conversion of harmful nitrous oxide compounds to nitrogen, carbon dioxide and water vapours to control emissions. Thus, replace it immediately.
4. Exhaust System Parts - Your exhaust system begins at the engine with the purpose of removing toxic gases and fumes from your vehicle. The components are a series of pipes, catalytic converters, sensors, mufflers, and often a resonator, as well as other emission devices. Thus, replace damaged exhaust system now!
5. Powertrain Control Module - Powertrain Control Module can also be faulty in rare cases and thus needs through checks for system and software errors. Thus, check and replace it, if required.
6. Electronic Control Unit - The ECU manages the cooling system to control the battery operating temperatures and thus must be replaced, if found faulty. Thus, buy new ECU modules and components from us!
7. Diagnostic Tool - Make use of quality diagnostic tools to resolve any OBD error code. Buy quality diagnostic tools from us!
8. Mass Air Flow Sensor - Wrong information sent by the sensor will affect the engine performance adversely as it will not be able to properly read the air entering the system thus hampering the air to fuel ratios directly impacting the engine’s output. Thus, it is advisable to replace them in time.
9. Manifold Absolute Pressure Sensor - If you are experiencing any problem with the manifold absolute pressure sensor, you should replace them immediately. Shop from us now!
10. Barometric Pressure Sensor - The BAP Sensor is used to measure the atmospheric pressure of the environment the engine is driving in. Thus, it plays a very important role in the engine’s performance. Replace the faulty BAP sensor now!
11. Fuel Injector - If there is a leakage in the fuel injectors, then it might cause rise in the fuel consumption, fuel odours around the vehicle and hard starting. You can always rely on us as we have best auto parts for our customers.
12. Fluid Pump - The fluid pump is usually located in the cover of the transmission. It draws fluid from a pump in the bottom of the transmission and feeds it to the hydraulic system. It also feeds the transmission cooler and the torque converter. Thus, replace faulty fluid pump now!
13. Heated Oxygen Sensor - The fault in the oxygen sensor leads to failure of the fuel delivery system, and engine control module. Replace faulty sensors immediately.
14. EVAP Leak Detection Pump - The LDP is a totally integrated unit. It is comprised of the pump itself, LDP solenoid, reed switch and related vacuum hoses. The LDP is an electromechanical device. It has the duty of pressurizing the EVAP system so as to make it possible for the ECM to check for leaks. It is capable of pressurizing or inflating the fuel tank and canister to about 0.25 psi, which is enough for leak detection purposes.
15. Vapor Canister Valve - Often, purge valves get stuck partially open or closed because of chunks of carbon, and require cleaning or replacement. However, while removing these faulty valves, pieces of carbon often tend to fall into the exhaust manifold, which can be drawn into the cleaned or replaced valve again.
16. Vapor Canister Purge Solenoid - Another symptom commonly associated with a bad vapor canister purge solenoid is difficulty starting the car. Again, if a vacuum leak is created as a result of any problem with the canister purge solenoid that may cause the vehicle to have difficulty starting reliably. A vacuum leak will allow unmetered, outside air into the engine, which can disturb the air-fuel ratio and cause performance issues by interrupting the internal combustion process. Eventually, the engine may refuse to start entirely.

If you are facing OBD error code P2405, then there are significant common symptoms that can be felt or observed. We have worked out a list here to help you out in understanding this problem better.

Common Symptoms

• Check Engine Light is on
• Decreased fuel economy
• Fuel smell due to release of fuel vapour

It is very important to fix the fault code P2405. So here are some ways with which you can correct this issue:

• Replacement of gas cap
• Replacement of the fuel filler neck
• Repair/replace any hose problems
• Replacing faulty EVAP pump and blown fuses
• Replacing/repairing corroded or damaged connector pins and loose connections
• Replacing EVAP pump relay

However, if you face any issue then we have stocked a wide range of best priced ECM, EVAP, PCM, Intake Manifold, EVAP Pump Relay, EVAP System and more to help you out in fixing your car.

If you want to easily diagnose this fault code P2405, then all you have to do is to follow the steps which are mentioned below:

Remove the gas cap and replace it nice and tight to secure a sealed fuel tank. Clear the codes from your code reader tool, drive your car for a day and then check if the code comes back. If gas cap doesn’t feel tight and secure, then it’s a good time to retire it and get a new one.

Inspect the EVAP system for signs of damage such as cuts or holes along the tubes and hoses. You may notice a fuel smell or vacuum noise. Repair the problem as soon as possible. Also, check the EVAP canister purge volume control solenoid valve. Follow the vacuum line from your intake manifold to locate the EVAP canister purge volume control solenoid.

Then, unplug the 2-pin weatherproof connector and test it for proper power and signal. You can do it by unplugging the connector and check the hoses for leaking. Fill a bottle with soapy water and gently spray it on the hoses to detect signs of leaks.

Then, move down the vacuum line until you see the EVAP resonator. It’s the plastic 1-way valve that leads to EVAP service port, usually covered by a green cap. Take off the adaptor for EVAP service port and pressure tested and start looking for leaks. Once you have found the leak, replace the vacuum line. This will usually fix the error code P2405.

Check for the open or damaged circuits to the EVAP pump and repair or replace them immediately. Also check of loose connections and relay problems and resolve the issue fast. Always retest the vehicle performance to check if the codes reappear.

Common Mistakes When Diagnosing the P2405 Code

• Missing/damaged fuel cap
• Distorted or damaged Fuel Tank Filler Neck
• Torn or punctured Evaporative system hose(s)
• Defective Fuel Tank Sending Unit gasket or seal
• Split or damaged Carbon Canister
• Defective Evaporative Vent Valve and/or Evaporative Purge Valve
• Defective or damaged fuel tank
• Defective Fuel Tank Pressure Sensor