Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance
What does P2404 mean?
The P2404 code means the vehicle's onboard diagnostic system has detected: Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance. This is a low severity code.
Common Symptoms
- Check Engine Light illuminated
- Failed emissions test
- No noticeable drivability issues
- EVAP system readiness monitor not completing
- Possible fuel vapor smell
Probable Causes (Ranked by Likelihood)
- Weak or degraded leak detection pump Very High
- Small EVAP system leak affecting pump performance High
- Loose or cracked gas cap Moderate
- Cracked EVAP hose or canister Moderate
Step-by-Step Diagnostic Procedure
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Check gas cap for proper seal and tightness
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Perform an EVAP smoke test to find any leaks
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Test leak detection pump pressure output
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Inspect all EVAP hoses for cracks or disconnections
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Check the charcoal canister for damage
Frequently Asked Questions
Can I drive with code P2404?
Yes, safe to drive. This is purely an emissions code with no effect on vehicle operation.
What causes P2404?
Often a small EVAP leak or a gas cap that is not sealing properly. Try tightening or replacing the gas cap first before further diagnosis.
Is P2404 expensive to fix?
Costs range from $50 for a gas cap to $400 for pump replacement. An EVAP smoke test is recommended to pinpoint the leak source.