EVAP Leak Detection Pump Control Circuit/Open
The P2400 code indicates an open or short 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 continuity. When the circuit is open (no continuity) or has excessive resistance, the PCM sets this code. Common causes include a faulty pump, damaged wiring, or a blown fuse.
1. Most Common Causes
- Faulty EVAP leak detection pump
- Open or shorted wiring in pump circuit
- Blown fuse for EVAP pump
- Corroded or loose electrical connector
- Failed PCM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Failed emissions test
- Possible fuel odor
- No noticeable drivability issues usually
3. Step-by-Step Diagnosis
Step 1: Scan for codes and note freeze frame data.
Step 2: Visually inspect the EVAP pump connector and wiring for damage or corrosion.
Step 3: Check the EVAP pump fuse with a multimeter.
Step 4: Test the pump's electrical circuit for continuity and voltage at the connector.
Step 5: If circuit is good, replace the EVAP leak detection pump.
4. 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 and the Check Engine Light will remain on. It's best to repair it soon to avoid potential fuel vapor leaks.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and whether you DIY. The pump itself is often around $30-$80.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.