EVAP Leak Detection Pump Sense Circuit Intermittent/Erratic
The P2407 code indicates an intermittent or erratic signal from the evaporative emission (EVAP) leak detection pump sense circuit. This circuit monitors the pump's operation during the EVAP system leak test. An intermittent fault may be caused by loose connections, damaged wiring, or a failing pump. The issue can lead to failed emissions tests and potential fuel vapor leaks.
01. Most Common Causes
- Faulty EVAP leak detection pump
- Damaged or corroded wiring/connectors in the sense circuit
- Loose or intermittent electrical connection
- Failed engine control module (ECM) (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Failed emissions test
- Possible fuel odor near vehicle
- Intermittent or no EVAP system leak detection
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm P2407 and check for other EVAP codes.
Step 2: Visually inspect the EVAP leak detection pump and its wiring harness for damage, corrosion, or loose connections.
Step 3: Test the pump's electrical connector for proper voltage and ground using a multimeter.
Step 4: Perform a wiggle test on the wiring while monitoring the sensor signal to isolate intermittent faults.
Step 5: If wiring is intact, replace the EVAP leak detection pump and clear the code.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, it is generally safe to drive, but the vehicle may fail an emissions test and there is a small risk of fuel vapor leakage.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Replacing the EVAP leak detection pump can range from $100-$300 including parts and labor.