Evaporative Emission System Leak Detection Pump Sense Circuit Open
What does P2403 mean?
The P2403 code means the vehicle's onboard diagnostic system has detected: Evaporative Emission System Leak Detection Pump Sense Circuit Open. This is a low severity code.
Common Symptoms
- Check Engine Light illuminated
- Failed emissions test
- No drivability symptoms
- EVAP readiness monitor incomplete
- Diagnostic trouble codes related to EVAP leak testing
Probable Causes (Ranked by Likelihood)
- Failed pressure sense circuit in leak detection pump Very High
- Broken sense wire from pump to ECM High
- Corroded connector at pump sense circuit Moderate
- ECM sense input circuit fault Low
Step-by-Step Diagnostic Procedure
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Check the leak detection pump connector for all pins making contact
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Measure voltage on the sense circuit wire with key on
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Inspect the sense wire from the pump to the ECM for breaks
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Check connector corrosion at the pump and ECM ends
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Test the pump pressure sensor output with a scan tool
Frequently Asked Questions
Can I drive with code P2403?
Yes, safe to drive. This code only affects the EVAP leak testing capability and has no impact on engine operation.
What causes P2403?
Usually a failed pressure sensor inside the leak detection pump or a broken sense wire. The pump assembly typically needs replacement.
Is P2403 expensive to fix?
Typically $100 to $450. The leak detection pump assembly is the most common repair. Check wiring and connectors first.