P2400 low

Evaporative Emission System Leak Detection Pump Control Circuit Open

The P2400 code means the vehicle's onboard diagnostic system has detected: Evaporative Emission System Leak Detection Pump Control Circuit Open. This is a low severity code.

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Keep driving?
Yes, but fix soon
DIY difficulty
moderate
Estimated cost
$100 - $400 (parts and labor)
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Common Symptoms

  • Check Engine Light illuminated
  • Failed emissions test
  • No noticeable drivability symptoms
  • Fuel vapor smell near vehicle
  • EVAP system monitor not completing

Probable Causes (Ranked by Likelihood)

  • Failed EVAP leak detection pump Very High
  • Damaged wiring to leak detection pump High
  • Corroded leak detection pump connector Moderate
  • Blown EVAP pump fuse Low

Step-by-Step Diagnostic Procedure

  1. Check the EVAP leak detection pump fuse

  2. Locate the leak detection pump (usually near the fuel tank or charcoal canister)

  3. Check power and ground at the pump connector

  4. Measure pump motor resistance

  5. Inspect wiring from ECM to the leak detection pump

Frequently Asked Questions

Can I drive with code P2400?

Yes, safe to drive. This EVAP code does not affect engine performance or safety. However, you will fail an emissions test until it is repaired.

What causes P2400?

Usually a failed EVAP leak detection pump. These pumps are used to pressurize the fuel system to check for fuel vapor leaks.

Is P2400 expensive to fix?

Typically $100 to $400. The leak detection pump is a moderately priced part. Check the fuse and wiring first for a potentially cheaper fix.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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