EVAP Leak Detection Pump Control Circuit/Open
The P2400 code indicates an open or malfunction in the control circuit of the Evaporative Emission (EVAP) leak detection pump. This pump is part of the EVAP system, which prevents fuel vapors from escaping into the atmosphere. The powertrain control module (PCM) monitors the pump's electrical circuit for proper voltage and current. When an open circuit is detected, the PCM sets this code. Common causes include a faulty pump, damaged wiring, or a blown fuse.
01. Most Common Causes
- Faulty EVAP leak detection pump
- Open or shorted wiring in the pump control circuit
- Blown fuse or relay for the pump
- Corroded or loose electrical connector
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Failed emissions test
- Possible fuel odor
- No noticeable drivability issues
03. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P2400 is present. Check for related codes.
Step 2: Visually inspect the EVAP leak detection pump and its wiring for damage, corrosion, or loose connections.
Step 3: Test the pump's electrical circuit using a multimeter to check for continuity, voltage, and ground.
Step 4: Check the fuse and relay for the pump; replace if blown.
Step 5: If wiring and fuses are good, replace the EVAP leak detection pump.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, it is generally safe to drive, but the vehicle may fail an emissions test. The EVAP system is not critical for engine operation.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and shop rates.