P2402 OBD Error Code: Problem & Solutions

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The evaporative emission system is designed to prevent the escape of fuel vapors from the fuel system. Leaks in the system, even small ones, can allow fuel vapors to escape into the atmosphere. Government regulations require onboard testing to make sure that the evaporative (EVAP) system is functioning properly. The leak detection system tests for EVAP system leaks and blockage. It also performs self-diagnostics.

OBD code P2402 means Evaporative Emission System Leak Detection Pump Control Circuit High.

The LDP assembly consists of several parts. The solenoid is controlled by the PCM, and it connects the upper pump cavity to either engine vacuum or atmospheric pressure. A vent valve closes the EVAP system to atmosphere, sealing the system during leak testing. The pump section of the LDP consists of a diaphragm that moves up and down to bring air in through the air filter and inlet check valve and pump it out through an outlet check valve into the EVAP system.

The diaphragm is pulled up by engine vacuum, and pushed down by spring pressure, as the LDP solenoid turns on and off. The LDP also has a magnetic reed switch to signal diaphragm position to the PCM. When the diaphragm is down, the switch is closed, which sends a 12 V (system voltage) signal to the PCM. When the diaphragm is up, the switch is open, and there is no voltage sent to the PCM. This allows the PCM to monitor LDP pumping action as it turns the LDP solenoid on and off.

What causes this problem with the Evaporative Emission System Leak Detection Pump Control Circuit High?

• LDP (Leak Detection Pump) faulty
• EVAP leak detection pump circuit faulty wirings
• Purge control solenoid faulty
• Clogged or damaged vapor canister
• Vacuum leakages

1. Engine Control Module - Is your car engine light still staying ON after resetting or your car engine is turning off for no reason? Then these are some common symptoms indicating that your car engine control module is defective.
2. Powertrain Control Module - The PCM works as the central computer system in an automobile’s mechanism. This auto part is the in charge of all the constituents as well as the functions performed by them. Having such enormous importance in the operation of all the parts means that any defect in it will affect almost every aspect of a car.
3. Electronic Control Unit - The ECU is a major component of your car's onboard computer. It's used to regulate many systems and subsystems in your car's engine, drive train and other major components. Visit us to buy best quality ECU online.
4. Diagnostic Tools – Take help of a professional mechanic to diagnose OBD code error. Use high grade diagnostic tools to resolve this issue. Buy new tools and equipment form us!
5. EVAP Leak Detection Pump - A leak detection pump (LDP) utilizes engine vacuum to help detect leaks. The LDP has a diaphragm that changes in shape as pressure in the vacuum rises. When the right level is reached, the LPD shuts off which also prevents any more build up in the vacuum. The Powertrain Control Module (PCM) times this whole process and uses the information to determine if there is a problem in the system.
6. Vapor Canister Valve - The most common problem with the purge valve is when it sticks or does not close fully. This may cause the "Check Engine" warning light to come on. In some cars, a stuck-open purge valve can cause difficulty starting right after refuelling at a gas station. Thus, replace it immediately.
7. Vapor Canister Purge Solenoid - One of the first symptoms that a faulty canister purge valve may produce is a rough idle. If the canister purge valve fails and sticks open, it will create a vacuum leak that can affect the engine idle speed and quality. A vacuum leak can also be created if the purge solenoid, or any of the hoses that may be attached to it break or become damaged.

Willing to know some common symptoms of OBD Code P2402? Your wish is our demand. Have a look at them below:

Common Symptoms

• Check Engine Light illuminated
• Noticeable fuel odour caused by the release of fuel vapours
• Stalling and lean/rich engine conditions

We have listed out some ways which would help you to correct the occurrence of OBD Code P2402. They are mentioned here as follows:

• Vapor canister must function properly and should be replace in needed
• LDP repair or replacement
• Damaged wiring to the LDP to be repaired

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If you want to easily diagnose this fault code P2402, then all you have to do is to follow the steps which are mentioned below:

• For any EVAP code, the mechanic shall first inspect the fuel cap, retighten it, clear the code, and reset the engine computer.
• Then, test the vehicle to see if the code returns. If not, then it’s just another case of “loose gas cap syndrome.” However, if the code persists, the leak detection pump could be the culprit.
• Use a professional OBD-II scanner, and look at the leak detection pump readings to see if the engine computer is reading from the pump.
• If not, the wiring from the sensor should be inspected to ensure there isn’t a communication error before replacing the LDP.
• Inspect for the faults in the PCM and replace or reprogram it as required. Sometimes, the fault in the PCM can result in wrong error code or multiple error codes getting stored in the system. Thus, proper check for all the components is required.

Common Mistakes When Diagnosing the P2402 Code

It is important to follow the correct diagnosis to resolve the OBD code P2402 error. Unnecessary replacements without proper inspection should be avoided. Always check for loose caps and damaged valves first as well as faulty wirings before going to LDP 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