P2402 Fault Code

Evaporative Emission System Leak Detection Pump Control Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2402 fault code indicates a problem with the control circuit of the Evaporative Emission System Leak Detection Pump. This system is responsible for capturing and recovering fuel vapors from the fuel tank to prevent them from escaping into the atmosphere. A high voltage or short circuit condition in the control circuit can trigger this code, leading to potential issues with emissions and engine performance.

What are the symptoms of the P2402 code?

When the P2402 code is triggered, drivers may experience:

• Illuminated check engine light (CEL) on the dashboard.
• Decreased fuel efficiency or performance issues.
• Fumes or fuel odors due to potential evaporative leaks.
• Failures during emissions testing, leading to possible legal penalties.

What causes the P2402 code?

Several factors can lead to the P2402 fault code, including:

• A faulty leak detection pump, which may produce inconsistent readings.
• Damaged or corroded wiring or connectors in the control circuit.
• An issue with the Engine Control Module (ECM) that manages the leak detection pump.
• A blown fuse that affects the pump operation.
• Vacuum leaks in the evaporative system that disrupt pressure levels.

How to fix P2402?

To resolve the P2402 fault code, consider these steps:

• Inspect the wiring and connectors in the leak detection pump control circuit for damage or corrosion.
• Test the leak detection pump to ensure it is functioning properly; replace if necessary.
• Check for blown fuses and replace them if needed.
• Diagnose the ECM to rule out programming or malfunction issues.
• Repair any existing vacuum leaks within the evaporative emission system.