EVAP Leak Detection Pump Circuit Range/Performance
The P2404 code indicates that the Engine Control Module (ECM) has detected a malfunction in the Evaporative Emission (EVAP) system leak detection pump sense circuit. This pump is part of the EVAP system's leak detection module, which pressurizes the system to check for leaks. The code is set when the pump's sense circuit signal is out of the expected range or performance parameters, often due to electrical issues, pump failure, or wiring problems.
1. Most Common Causes
- Faulty EVAP leak detection pump
- Open or shorted wiring in the pump sense circuit
- Corroded or loose electrical connectors
- Failed EVAP system control module
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Failed emissions test
- Possible fuel odor
- No noticeable drivability issues
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the EVAP leak detection pump and wiring for damage or corrosion.
Step 3: Test the pump's electrical circuit using a multimeter for continuity and proper voltage.
Step 4: Perform a smoke test to check for EVAP system leaks.
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. The EVAP system prevents fuel vapors from escaping, so a leak could cause a fuel smell but not immediate drivability issues.
How much does it cost to fix?▼
The cost to diagnose and repair P2404 typically ranges from $50 to $150 for diagnosis, plus parts and labor. The leak detection pump itself can cost $100-$300, and labor may add $100-$200.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.