P2406 Code - Evaporative Emission System Leak Detection Pump Sense Circuit High
Quick Answer
The P2406 diagnostic trouble code (DTC) indicates a problem with the Evaporative Emission System Leak Detection Pump Sense Circuit being too high. Common causes include Faulty Leak Detection Pump: The most common cause of the P2406 code is a malfunctioning leak detection pump that is sending a high voltage signal to the sense circuit, Wiring Issues: Damaged or corroded wiring in the evaporative emissions system can cause electrical problems and trigger the P2406 code, Vacuum Leaks: Any leaks in the vacuum lines or hoses connected to the evaporative emissions system can disrupt the system's operation and trigger the code. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P2406 indicates Evaporative Emission System Leak Detection Pump Sense Circuit High.
- Common causes
- Common causes include Faulty Leak Detection Pump: The most common cause of the P2406 code is a malfunctioning leak detection pump that is sending a high voltage signal to the sense circuit, Wiring Issues: Damaged or corroded wiring in the evaporative emissions system can cause electrical problems and trigger the P2406 code, Vacuum Leaks: Any leaks in the vacuum lines or hoses connected to the evaporative emissions system can disrupt the system's operation and trigger the code.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P2406 Description
The P2406 diagnostic trouble code (DTC) indicates a problem with the Evaporative Emission System Leak Detection Pump Sense Circuit being too high. This system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from being released into the atmosphere. The leak detection pump (LDP) is a key component of this system, as it monitors for leaks in the evaporative emissions system.
Common Causes of P2406
- Faulty Leak Detection Pump: The most common cause of the P2406 code is a malfunctioning leak detection pump that is sending a high voltage signal to the sense circuit.
- Wiring Issues: Damaged or corroded wiring in the evaporative emissions system can cause electrical problems and trigger the P2406 code.
- Vacuum Leaks: Any leaks in the vacuum lines or hoses connected to the evaporative emissions system can disrupt the system's operation and trigger the code.
- Faulty Purge Valve: A malfunctioning purge valve can cause the system to not function properly, leading to the P2406 code.
- Gas Cap Issues: A loose, damaged, or missing gas cap can also trigger the P2406 code as it can lead to fuel vapors escaping from the fuel tank.
Symptoms of P2406
- Check Engine Light: The most common symptom associated with the P2406 code is the illumination of the check engine light on the vehicle's dashboard.
- Decreased Fuel Efficiency: A malfunctioning evaporative emissions system can lead to decreased fuel efficiency as fuel vapors are not being properly captured and recycled.
- Strong Fuel Odor: A strong smell of fuel, especially near the fuel tank or under the vehicle, can indicate a leak in the evaporative emissions system.
- Failed Emissions Test: If the P2406 code is not addressed, it can cause the vehicle to fail emissions tests due to increased emissions.
How to Fix P2406
- Diagnose the Issue: Use a scan tool to read the DTC and pinpoint the exact cause of the P2406 code.
- Inspect Wiring and Connections: Check the wiring and connections in the evaporative emissions system for any damage or corrosion. Repair or replace as needed.
- Test the Leak Detection Pump: Test the leak detection pump to ensure it is functioning properly. Replace if necessary.
- Check Vacuum Lines: Inspect the vacuum lines and hoses for any leaks or damage. Repair or replace as needed.
- Replace Purge Valve: If the purge valve is found to be faulty, replace it to restore proper operation of the evaporative emissions system.
Cost to Fix P2406
The typical repair costs for addressing the P2406 code can range from $150 to $500, depending on the specific cause of the issue and the cost of parts and labor in your area. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's recommended to get a detailed estimate from a trusted mechanic before proceeding with the repairs. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more affordable options.
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Code P2406 Information for Specific Makes
- P2406 Dodge — Evaporative Emission System Leak Detection Pump Sense Circuit High
- P2406 Hyundai — Evaporative Emission System Leak Detection Pump Sensor Circuit High
- P2406 Jaguar — Evaporative Emission System Leak Detection Pump Sense Circuit High
- P2406 KIA — Evaporative Emission System Leak Detection Pump Sensor Circuit High
- P2406 Land Rover — Evaporative Emission System Leak Detection Pump Sense Circuit High
- P2406 Volvo — EVAP System Leak Detection Pump Sense Circuit High
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