EVAP Leak Detection Pump Control Circuit High
The P2402 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the control circuit of the evaporative emission (EVAP) leak detection pump. This pump is part of the EVAP system that tests for fuel vapor leaks. A high voltage signal suggests a short to power, open circuit, or a faulty pump assembly. This can prevent the system from properly detecting leaks, potentially causing increased emissions and a check engine light.
01. Most Common Causes
- Faulty EVAP leak detection pump
- Short to power in the pump control circuit
- Open or damaged wiring/connectors
- Corroded or loose electrical connections
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Failed EVAP system leak test
- Possible fuel odor
- Decreased fuel economy (minor)
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the EVAP leak detection pump and its wiring for damage, corrosion, or loose connections.
Step 3: Using a multimeter, check the control circuit voltage at the pump connector. Compare to manufacturer specifications.
Step 4: Test the pump resistance and operation per service manual. Replace if out of spec.
Step 5: If wiring and pump are okay, check for PCM issues or perform a pin drag test on connectors.
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 check engine light will be on and the vehicle may fail an emissions test. It's best to repair it soon to avoid potential drivability issues.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor. The pump itself costs $50-$150, and labor adds $100-$250 depending on the vehicle.