Evaporative Emission System Leak Detection Pump Control Circuit Low
What does P2401 mean?
The P2401 code means the vehicle's onboard diagnostic system has detected: Evaporative Emission System Leak Detection Pump Control Circuit Low. This is a low severity code.
Common Symptoms
- Check Engine Light illuminated
- Failed emissions inspection
- No noticeable driving symptoms
- EVAP monitors incomplete
- Possible faint fuel odor
Probable Causes (Ranked by Likelihood)
- Short to ground in leak detection pump wiring Very High
- Failed leak detection pump motor (shorted) High
- Corroded pump connector causing low resistance Moderate
- ECM driver circuit shorted to ground Low
Step-by-Step Diagnostic Procedure
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Measure voltage at the leak detection pump connector
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Check pump motor resistance (should not read near zero)
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Inspect wiring for chafing or exposed conductors near the fuel tank
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Check connector for corrosion or water damage
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Verify ECM output signal with a test light
Frequently Asked Questions
Can I drive with code P2401?
Yes, safe to drive normally. This is an emissions-related code with no impact on engine performance or vehicle safety.
What causes P2401?
Typically a shorted leak detection pump or wiring that has been damaged by road debris near the fuel tank area.
Is P2401 expensive to fix?
Usually $100 to $400. Pump replacement is the most common fix. Wiring repairs near the fuel tank are less expensive if accessible.