Guide To P2407 OBD Error Code Solutions

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Check Engine Light on and fuel vapour odour from the vehicle are the two major symptoms that can be an indication of leakages in the EVAP system and leading to OBD code P2407 getting stored in the Powertrain Control Module (PCM).

Although this code doesn't cause driveability problems, but states that a vacuum leak is present that compromises the evaporative emission system operation. Automobiles require two types of controls over emissions -- passive and active. The active portion relates to the fuel ratio control and the catalytic converter's ability to convert carbon monoxide, oxides of nitrogen and hydrocarbons into harmless water and carbon dioxide. The passive relates to this P2407 code. Fuel vapour accounts for 20 percent of the harmful emissions through evaporation. To prevent these vapours from entering the atmosphere they are contained within the fuel system and re-enter the engine via the intake manifold.

The evaporative emission system consists of the fuel tank, a vacuum hose to the charcoal canister for containing the fuel vapours, pressure sensor on the fuel tank, purge valve on the charcoal canister, vacuum hose to the filler neck shut off valve and vacuum hose from the charcoal canister purge valve to the intake manifold. When the engine is off, the vent shutoff valve and canister purge valve are closed. The fuel can't escape into the atmosphere. When the engine starts, the purge valve on the canister opens to allow the trapped fuel vapour to be drawn by engine vacuum into the intake manifold. At the same time the vent shutoff valve also opens to allow a small amount of air to enter the canister and mix with the fuel vapour for a better mixture. Once vented and the pressure sensor in the tank shows a significant drop, both valves close sealing the system once again.

When the PCM detects problem in the leak detection system of the exhaust system, OBD code P2407 may occur.

What causes this problem with the Evaporative Emission System Leak Detection Pump Sense Circuit Intermittent/Erratic?

• A missing, cracked, or loose gas cap
• A cracked or rotten hose
• A cracked vacuum canister
• A faulty purge valve or solenoid
• A faulty EVAP leak detection pump
• Faulty wiring and connections to the EVAP pump
• A faulty leak pressure sensor

1. Electronic Control Unit - ECU monitors the temperature differences in the boost converter with the help of the temperature sensors to prevent the converter from overheating and malfunctioning. Thus, replace faulty ECU immediately.
2. Automatic Transmission Module - Sometimes the automatic transmission module is unable to communicate or correctly anticipate the speed of the vehicle and thus creates difficulty in gear shift leading to sluggish acceleration, throttle response and stalling. Thus can also hamper a lot of components physically and thus must be check for and replaced, if required.
3. Engine Control Module - ECM failures and faults can be very difficult to find and resolve as these are very rare and might require a complete reprogramming of the system to avoid wrong codes from getting stored in the system, leading to misdiagnosis. Replace it now!
4. Powertrain Control Module - Faulty PCM can disrupt the normal functioning of the vehicle by affecting the transmission system and the fuel delivery system. This will cause the system to store wrong OBD error and thus can lead to misdiagnosis.
5. Oxygen Sensor - If the fuel to air ratio is not correct, the engine may work in lean or rich conditions. This not only hampers the performance output, but also affects the fuel economy, exhaust emissions and acceleration. Thus, a faulty oxygen sensor must be replaced as if it important for keeping in check the oxygen levels entering/exiting the engine.
6. Exhaust Gas Recirculation Valve - It is auto part commonly found on many road going automobiles. It is a part of the vehicle’s exhaust gas recirculation (EGR) system, an emissions system that is designed to recirculate exhaust gases back into the vehicle’s intake so that it can reduce cylinder temperatures and NOx emissions. Purchase top notch exhaust gas recirculation valve from us at economical prices.
7. Diagnostic Tool - In order to be that DIY guy, you need few diagnostic tools to get your car problems pointed out easily. Our diagnostic tools collection will come handy to do so, so why not have a look?
8. Diesel Exhaust Fluid Pump - For the proper functioning of the transmission system, the diesel exhaust fluid pump needs to work properly. If it is not functioning, the transmission may slip and cause harsh shifts too. Thus replace faulty pump now and buy a new one from us!
9. Fuel Injector - The fuel injector is responsible for maintaining the optimal levels of the air to fuel ratios in the combustion chambers for the maximum out from the engines. It the fuel injector goes down, it hampers the entire efficiency of the engine. Thus, check and replace the bad injector now!
10. Diesel Exhaust Fluid Pump - If the DEF pump is not functioning properly, the exhaust system will not be able to properly manage the harmful emissions from the vehicle and can also result in inefficient fuel consumption. Thus, replace it now, if found defective.
11. EVAP Leak Detection Pump - Leak detection pumps provide pressure so the system can be checked for leaks while other EVAP system valves are closed. A faulty leak detection pump will cause a check engine warning and is an emission relevant component.
12. Vapor Canister Valve - The purge valve is an integral part of the EVAP system. When fuel is converted to gas, instead of allowing it to escape, it is redirected towards a charcoal canister where it gets collected. When the car's ECU sends the signal, the purge valve opens up, allowing the gas vapors to be sucked in by the engine's manifold, and thus be burned and utilized accordingly.
13. Vapor Canister Purge Solenoid - The canister purge solenoid is an emissions component and is, therefore, an important piece in making sure that the vehicle meets emission requirements. The purge valve prevents toxic hydrocarbons in fuel from leaking out your tailpipe. For this reason, if you suspect that your canister purge solenoid may be having a problem, have the vehicle diagnosed by a professional technician to determine if the canister purge solenoid or vacuum hose needs to be replaced.

Interested in knowing the symptoms to OBD code P2407? If yes, then you have arrived at the right place. We at PartsAvatar have listed out few common symptoms associated with this fuel injector problem.

Common Symptoms

• Check Engine Light illuminated
• Noticeable fuel odour caused by the release of fuel vapours
• Failed emission tests

After understanding the symptoms and few common causes behind the OBD error code, we are here to help you out in understanding the ways and means to correct the issue. To solve any issue you need to follow certain steps, and to solve OBD error code P2407, you will need to undergo the following replacements:

• EVAP leak detection pump
• EVAP purge valves
• EVAP purge solenoids
• EVAP pressure sensor and pump circuit wiring and connectors
• Fuel cap and pressure sensor
• PCM reprogramming

Apart from this, you might need to replace other damaged parts too like PCM, ECM, EVAP System, Purge Valve, Pressure Sensor, Charcoal Canister, Connectors, Emission Control System, Fuel Pressure Sensor, Gas Cap and more. You can easily find all these parts with us. Not only that you can get these parts shipped to your door free, if your cart value happens to exceed $99.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P2407 code to be stored:

• The first step in testing the system is to make sure that no electrical problems exist. Use a scanner or a voltage injection probe to actuate the LDP solenoid. First, feel for the solenoid clicking and then apply vacuum with a hand vacuum pump to the vacuum port. Make sure the vacuum drops when the LDP solenoid is activated. If it doesn’t, then it is clogged. If it does not click, then the internal coil has an open circuit. Verify with an ohm meter.
• If the solenoid test has passed, then connect a VOM or a scope to the reed switch output while activating the solenoid. Every time the LDP’s diaphragm moves up-and-down the reed should switch on-off. This should be readily seen on the scope or VOM display. On some vehicles, the scanner can read the reed signal as a data-stream PID. Look for it. Failure of the reed switch will render the EVAP monitor inoperative, since the ECM uses the reed switch as an indicator of EVAP pressurization.
• With the EVAP LDP monitor commanded to run (using the scan tool or equivalent), probe the reed switch output. As the fuel tank and canister begin to pressurize the switching frequency should begin to drop. This is an indication of EVAP pressure build up.
• With the LDP solenoid switching (EVAP monitor running), feel for suction at the LDP inlet (filter side) and pumping action at the LDP outlet (canister side). If no suction or pumping is felt, internal damage might be the cause.
• Check the atmospheric line for obstruction. An obstruction will not let the diaphragm move up-and-down preventing the LDP from working properly.
• If the LDP keeps working continuously, suction is felt, air is being pumped, and the reed switch cycling on-off then there is an EVAP leak. In this case, the unit is doing exactly what it is supposed to do. Remember that continuous LDP operation (with reed switch signal cycling) is telling the ECM that there is an EVAP leak. And with no EVAP leak, as the system builds up pressure the reed signal output frequency will begin to drop.
• Manual actuation of the LDP solenoid with the power probe is sometimes necessary in the absence of a good scanner with bi-directional control. In this case, connect a VOM or GMM/scope to the reed switch and manually energize the LDP solenoid. As soon as the signal cycles, de-energize the LDP solenoid. Keep doing that until the reed signal stops switching, which is an indication that the EVAP system is pressurized. If not, there is a leak in the EVAP system. Start crimping and isolating the different sections of the EVAP system so as to find the faulty section (fuel tank, canister, hoses, purge valve, etc).

Common Mistakes When Diagnosing the P2407 Code

Always check for loose caps and damaged valves first as well as faulty wirings before going to sensors and other costly components for replacement.

• Check for faulty wiring and connections
• Faulty sensors and fuel pumps
• EVAP canister valve errors
• Powertrain Control Module failure
• EVAP pressure sensor faulty
• Pressure sensor connector faults
• LDP filler neck problematic