What is OBD-II Code P2402 – EVAP System Leak Detection Pump Control Circuit High



OBD-II Code P2402 – EVAP System Leak Detection Pump Control Circuit High: A Comprehensive Guide for Non-Technical Individuals

The OBD-II Code P2402 refers to an issue in the EVAP (Evaporative Emission Control System) System of a vehicle. This code pertains to a problem with the control circuitry in the Leak Detection Pump (LDP) of the vehicle. As a car owner, it is essential to understand what this code means and the necessary steps to take to repair the issue.

If you have received this code, it is an indication that there is a problem with the air-fuel ratio of your vehicle, which may lead to reduced fuel efficiency or even damage other components of your car. This article aims to provide you with an overview of the OBD-II Code P2402 and the necessary steps to repair it.

What is OBD-II Code P2402?

The EVAP system of a modern automobile is designed to prevent the release of fuel vapors into the atmosphere. The system is made up of several components, including the LDP, which is responsible for detecting fuel vapor leaks in the system.

When the OBD-II Code P2402 is triggered, it means that there is excessive voltage in the control circuit of the LDP. This high voltage can be caused by various factors, such as a faulty sensor, a damaged wiring harness, or a malfunctioning LDP.

The Role of the LDP in the EVAP System

As mentioned earlier, the LDP is an essential component of the EVAP system, responsible for detecting fuel vapor leaks. When the engine is turned off, the LDP releases air pressure into the EVAP system to run a self-test, detecting any leaks, and ensuring that the system is airtight.

In the event of a leak, the LDP will detect a pressure loss and trigger a trouble code. Besides, the LDP also assists in the monitoring of the fuel tank pressure and provides data to the vehicle’s onboard computer system.

How to Repair OBD-II Code P2402

If you receive the OBD-II Code P2402, it is essential to have the issue addressed right away to ensure the long-term health of your car. Here are the steps to take to repair the issue:

Step 1: Check the Wiring Harness

The first step in troubleshooting the issue is to check the wiring harness of the LDP for any damage. Ensure that all the connectors are free from corrosion and properly attached.

Step 2: Check the Sensor

After checking the wiring harness, it is essential to check the sensor to ensure that it is not damaged. The sensor can be tested using a multimeter that measures voltage and resistance. Checking the sensor’s resistance should give a reading within the manufacturer’s recommended range.

Step 3: Check the LDP

If there are no issues with the wiring harness or the sensor, the LDP is likely to be the problem. The LDP has a vent valve and a solenoid, both of which can be easily tested using a multimeter or an OBD-II scanner.

Step 4: Replace the Faulty Component

Once the problematic component has been identified, it is essential to replace it with a new one. Ensure that you use the manufacturer’s recommended replacement parts for your vehicle to ensure top-quality and optimal performance.

FAQs

1. What Causes OBD-II Code P2402?
The OBD-II Code P2402 is caused by excessive voltage in the control circuit of the LDP. This high voltage can be caused by a faulty sensor, a damaged wiring harness, or a malfunctioning LDP.

2. Is OBD-II Code P2402 a Serious Issue?
Yes, it is a serious issue that should be resolved as soon as possible. When this code is triggered, it means that there is an issue with the air-fuel ratio of your vehicle, which may lead to reduced fuel efficiency or even damage other components of your car.

3. Can I Drive with a Triggered OBD-II Code P2402?
It is not recommended to drive with a triggered OBD-II Code P2402 as it poses a severe threat to the long-term health of your vehicle. Besides, driving with a check engine light on may result in an emissions test failure.

4. Can I Repair OBD-II Code P2402 on My Own?
OBD-II Code P2402 requires specific diagnostic tools to identify the root cause of the issue. While it is possible to repair minor issues such as checking the wiring harness, it is recommended to have the issue addressed by a professional mechanic with proper diagnostic tools.

5. How much does it cost to repair OBD-II Code P2402?
The cost of repairing OBD-II Code P2402 may vary depending on the severity of the issue and the type of vehicle. In general, the cost of repairing this issue ranges from $100 to $500.

Conclusion

In summary, the OBD-II Code P2402 is a serious issue that should be resolved as soon as possible. Failure to address the issue may lead to reduced fuel efficiency or damage other components of your car. It is essential to follow the necessary steps to repair the issue, including checking the wiring harness, the sensor, and the LDP. If you are not confident in repairing the issue, it is recommended to seek the help of a professional mechanic.

Scroll to Top