The P2407: Evaporative Emission System Leak Detection Pump Sense Circuit Intermittent/Erratic refers to an issue where the sense circuit for the leak detection pump in the evaporative emission system is experiencing intermittent or erratic signals. This can lead to unreliable leak detection, increased emissions, and potential failure to pass emissions tests.
P2407 – Quick Overview
Code | Information |
---|---|
Meaning | P2407: Evaporative Emission System Leak Detection Pump Sense Circuit Intermittent/Erratic |
Is it serious? | Yes, this code can lead to increased emissions and may cause the vehicle to fail an emissions test. |
Possible causes | – Intermittent signal in the leak detection pump sense circuit – Faulty leak detection pump – Wiring or connector issues |
How to diagnose? | – Check for intermittent issues in the leak detection pump sense circuit – Inspect wiring and connectors – Replace faulty leak detection pump if necessary |
P2407 Meaning
The P2407: Evaporative Emission System Leak Detection Pump Sense Circuit Intermittent/Erratic code indicates that the sense circuit for the leak detection pump in the vehicle’s evaporative emission system is receiving inconsistent or fluctuating signals. The leak detection pump is responsible for pressurizing the system to identify any leaks that could allow fuel vapors to escape into the atmosphere. An intermittent or erratic signal can prevent the system from accurately detecting leaks, leading to increased emissions and potential environmental harm.
Step-by-step diagnostic guide
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to identify any additional related codes that might provide more context to the issue. Additional codes can help pinpoint the exact cause. | OBD-II Scanner |
Monitor the Leak Detection Pump Sense Circuit for Intermittent Issues | Use a diagnostic tool with live data capabilities to monitor the sense circuit while the engine is running. Look for fluctuations or irregular signals that indicate an intermittent or erratic condition. | OBD-II Scanner with Live Data, Diagnostic Tool |
Inspect Wiring and Connectors | Visually inspect all wiring and connectors associated with the leak detection pump sense circuit. Look for signs of wear, fraying, corrosion, or loose connections that could cause intermittent signals. Ensure all connectors are securely attached and free from debris. | Flashlight, Visual Inspection Tools, Connector Cleaning Tools |
Test the Leak Detection Pump | Use a multimeter to test the functionality of the leak detection pump. Check for proper voltage and continuity to ensure the pump is operating correctly. Activate the pump using a diagnostic tool and observe its response for any irregular behavior. | Multimeter, Diagnostic Tool, Replacement Leak Detection Pump |
Check for Electrical Noise or Interference | Inspect the electrical environment around the leak detection pump and its wiring for sources of interference that could cause erratic signals. Ensure that wiring is properly shielded and routed away from high-current cables or other potential sources of electrical noise. | Multimeter, Oscilloscope (if available) |
Inspect and Repair Wiring Issues | Trace the wiring from the control module to the leak detection pump, looking for any breaks, shorts, or damaged sections. Repair or replace any faulty wiring to restore proper circuit functionality and eliminate intermittent issues. | Wiring Repair Tools, Multimeter |
Replace Faulty Leak Detection Pump if Necessary | If the leak detection pump is determined to be faulty after testing, remove and replace it with a new or properly functioning unit. Ensure that the replacement pump is compatible with the vehicle’s emission system. | Replacement Leak Detection Pump, Basic Hand Tools |
Clear the Code and Test Drive | After performing the necessary repairs, clear the P2407 code using an OBD-II scanner. Take the vehicle for a test drive to ensure that the issue has been resolved and the code does not reappear. | OBD-II Scanner, Vehicle Owner’s Manual |
Recheck for Codes | After the test drive, use the OBD-II scanner again to verify that the P2407 code has been cleared. If the code returns, further diagnosis may be required to identify and fix underlying issues. | OBD-II Scanner |

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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)