Some evaporative emission systems (EVAP) rely on a leak detection pump sensor to keep track of the pressure level and spot any signs of a leak. The sensor sends its readings to the powertrain control module (PCM), which will log the appropriate diagnostic trouble code if it finds any discrepancies. If the PCM receives an intermittent or erratic voltage signal from the leak detection pump sensor, its diagnostics will log a P2407 code.
What Does the P2407 Code Mean?
The diagnostic trouble code (DTC) P2407 indicates “Evaporative Emission System Leak Detection Pump Sense Circuit Intermittent/Erratic.”
The EVAP system is an important part of a vehicle’s emission control. It collects vaporized fuel from the fuel tank and stores it in the EVAP cylinder. When the engine needs to burn more fuel to meet the current load, the EVAP system releases the fuel vapor.
A leak compromises the effectiveness of the EVAP system by allowing fuel vapor to escape into the atmosphere before it can reach the intake manifold. To counteract this potential problem, the leak detection pump sensor constantly checks the pressure within the system. If the pressure drops without explanation, there is likely a leak somewhere.
The PCM regularly checks the signals from the leak detection pump sensor. If the sensor doesn’t transmit its signals in time or sends the wrong voltage signals, the controller will set the generic code P2407.
Note: The definition of code P2407 can differ depending on the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.
What are the Common Causes of the P2407 Code?
- Bad leak detection pump
- Open or shorted wiring harness
- Loose or bad electrical connection for the leak detection pump circuit
- Bad purge valve
- Blocked or faulty charcoal canister
- An issue with the PCM
What are the Common Symptoms of the P2407 Code?
How to Diagnose the P2407 Code
The P2407 code is a generic code that can be logged by various vehicle makes and models. Its underlying problem and symptoms can vary between cases for various reasons, such as differences between manufacturers.
If you’re not confident about conducting diagnostic tests on your vehicle, it’s a good idea to bring it to a professional mechanic. Otherwise, you can go ahead and diagnose the issue yourself. To help you get started, here is a video that can give you an idea of what the process might involve:
How to Fix the P2407 Code
Anyone who wants to fix a P2407 code will need specific tools and knowledge to test and repair or replace the leak detection pump sensor. If you lack either or both, it’s best to let an expert resolve the issue for you.
If you’re a DIYer who has the advanced technical knowledge and hands-on experience required to effectively test and replace a faulty leak detection pump sensor, it helps to consult a repair manual or refer to an online repair database. Make sure you look for vehicle-specific information to ensure you’re following the right steps and protocols for your ride.
Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.
