AutoCodes – Generic – P2406

P2406 Code - Evaporative Emission System Leak Detection Pump Sense Circuit High

Quick Answer

This fault code is stored in the engine control module when there is a malfunction with the evaporative emissions control circuit. Common causes include Faulty EVAP System Leak Detection Pump, EVAP System Leak Detection Pump harness is open or shorted, EVAP System Leak Detection Pump circuit poor electrical connection. 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 EVAP System Leak Detection Pump, EVAP System Leak Detection Pump harness is open or shorted, EVAP System Leak Detection Pump circuit poor electrical connection.
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 Popularity 12,198

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 20, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P2406 Description

This fault code is stored in the engine control module when there is a malfunction with the evaporative emissions control circuit. The EVAP system allows the fuel tank to be vented in a controlled manner without releasing harmful gas emissions into the atmosphere. This is achieved by periodically allowing hydrocarbon emissions from the fuel tank into the intake manifold and enter the combustion process. The engine control module monitors the circuit integrity by monitoring the inductive spike generated when the solenoid valve is switched off. This is caused by the collapse of the magnetic field resulting in a back EMF (electro-motive force). A solenoid normally has a resistance of 15 Ohms. The solenoid valve will be actuated by a pulse width modulated control via the engine control module. The solenoid can be powered up by a constant supply at system voltage or have a constant ground.
The system may not purge the carbon canister under idle conditions. The vehicle may need to be driven for the system to operate, an actuator test may be used to operate the solenoid valve with a scan tool.
Due to the presence of harmful hydrocarbons within the system manufacturers have to closely monitor the system, in some markets. This is achieved by the addition of certain hardware to measure system pressure and gas flow. The engine control module can monitor the system for leaks (both large and small) and for excessive or insufficient flow. This allows the technician access to more information relating to the fault and provides a better chance of an accurate diagnosis.

OBDII Code P2406 - Evaporative Emission System Leak Detection Pump Sense Circuit High - AutoCodes.com — P2406 Code - Evaporative Emission System Leak Detection Pump Sense Circuit High

What does this mean?

What are the Possible Causes of the DTC P2406?

Faulty EVAP System Leak Detection Pump
EVAP System Leak Detection Pump harness is open or shorted
EVAP System Leak Detection Pump circuit poor electrical connection

How to Fix the DTC P2406?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2406 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.