EVAP Leak Detection Pump Control Circuit Low
The P2401 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition 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. A low voltage signal suggests a short to ground, open circuit, or a faulty pump assembly, potentially causing the system to fail a leak test and illuminate the Check Engine Light.
1. Most Common Causes
- Faulty EVAP leak detection pump
- Open or shorted wiring in the pump control circuit
- Corroded or damaged connector at the pump
- Failed PCM (rare)
2. Symptoms You Will Notice
- Check Engine Light on
- Failed emissions test
- Possible fuel odor
- No noticeable drivability issues
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P2401 and check for related codes.
Step 2: Visually inspect the EVAP leak detection pump and its wiring/connector for damage or corrosion.
Step 3: Test the pump control circuit voltage with a multimeter; compare to manufacturer specifications.
Step 4: If circuit is good, test pump resistance and operation; replace pump if faulty.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, the vehicle is generally safe to drive, but the EVAP system may not function properly, potentially causing a failed emissions test and increased fuel vapor release.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor, depending on the cause and vehicle make/model.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.