P2407
EVAP System Leak Detection Pump Sense Circuit Intermittent/Erratic
Evaporative emissions (EVAP)
Generic OBD-II
Low
What it means
P2407 means the signal from the EVAP leak detection pump's sense circuit is intermittent or erratic. This is an emissions-monitoring fault — it won't change how the car drives, but it will keep the check-engine light on. Common causes are a loose or corroded connector, chafed wiring, or a failing leak detection pump.
Low
Can I keep driving? Safe to drive — this is an emissions-monitoring fault with no effect on how the car runs, though it will fail an emissions test.
Common symptoms
What you'll notice
- Check-engine light on
- No noticeable change in how the vehicle drives
- May fail an emissions/readiness test
Common causes
Most likely first
- Faulty EVAP leak detection pump (LDP) sense circuitLikely
- Intermittent open or short in the LDP sense wiringCommon
- Corroded, loose, or chafed LDP connectorCommon
- Faulty leak detection pump assemblyLess often
- Poor ground or supply to the LDPLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check whether the fault is currently active or intermittent.
- Wiggle-test the LDP connector and harness while watching live data for dropouts.
- Inspect the LDP sense wiring and connector for corrosion or chafing.
- Check the LDP's ground and power feeds.
- Replace the leak detection pump if the wiring is good, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2407?+
Yes. It's purely an emissions-system monitor fault and doesn't affect drivability, but it should be repaired to pass emissions and turn off the light.
Can I just clear P2407?+
Because it's intermittent, it may stay off for a while but usually returns. Find the loose connection or failing pump to fix it for good.
Related codes
Often seen with P2407
Read & clear P2407 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX