P2405 low

Evaporative Emission System Leak Detection Pump Sense Circuit Low

What does P2405 mean?

The P2405 code means the vehicle's onboard diagnostic system has detected: Evaporative Emission System Leak Detection Pump Sense Circuit Low. This is a low severity code.

Common Symptoms

  • Check Engine Light illuminated
  • Emissions test failure
  • No drivability symptoms
  • EVAP monitors not completing
  • Possible fuel odor near vehicle

Probable Causes (Ranked by Likelihood)

  • Shorted sense wire in leak detection pump circuit Very High
  • Failed pressure sensor in pump (reading low) High
  • Corroded connector causing low signal Moderate
  • Large EVAP system leak preventing pressure buildup Moderate

Step-by-Step Diagnostic Procedure

  1. Check the pump sense circuit connector for corrosion

  2. Measure sense circuit voltage (compare to specification)

  3. Inspect wiring for shorts to ground

  4. Perform EVAP smoke test to check for large leaks

  5. Test pump output pressure with scan tool

Frequently Asked Questions

Can I drive with code P2405?

Yes, no driving concerns. Repair needed only for emissions compliance.

What causes P2405?

Usually a failed pressure sensor in the leak detection pump or a shorted sense wire. The pump assembly often needs replacement as a unit.

Is P2405 expensive to fix?

Typically $100 to $400. The pump assembly replacement is the standard repair.

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