AutoCodes – Generic – P2401

P2401 Code - Evaporative Emission Leak Detection Pump Stuck OFF

Quick Answer

5 hours after the ignition switch is turned off, the leak detection pump creates negative pressure (vacuum) in the Evaporative Emission (EVAP) system. Common causes include Faulty Canister Pump Module, Canister Pump Module harness is open or shorted, Canister Pump Module 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: P2401 indicates Evaporative Emission Leak Detection Pump Stuck OFF.
Common causes: Common causes include Faulty Canister Pump Module, Canister Pump Module harness is open or shorted, Canister Pump Module 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 33,375

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 Mar 26, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P2401 Description

5 hours after the ignition switch is turned off, the leak detection pump creates negative pressure (vacuum) in the Evaporative Emission (EVAP) system. The Engine Control Module (ECM) monitors for leaks and actuator malfunctions based on the EVAP pressure. The leak detection pump creates negative pressure through the reference orifice. When the system is normal, the EVAP pressure is between 97 to 100 kPa(abs) [726 to 750 mmHg(abs) (Typical value)] and saturated within a minute. If not, the ECM interprets this as a malfunction. The ECM illuminates the MIL and stores a Diagnostic Trouble Code (DTC) if this malfunction is detected in consecutive drive cycles. The Canister Pump Module is attached to the EVAP Canister and contains the Canister Pressure Sensor, the Leak Detection Pump, and the Vent Valve.

OBDII Code P2401 - Evaporative Emission Leak Detection Pump Stuck OFF - AutoCodes.com — P2401 Code - Evaporative Emission Leak Detection Pump Stuck OFF

What does this mean?

What are the Possible Causes of the DTC P2401?

Faulty Canister Pump Module
Canister Pump Module harness is open or shorted
Canister Pump Module circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2401?

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 P2401 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

P2401 BMW — Evaporative Emission System Leak Detection Pump Control Circuit Low
P2401 Dodge — Evaporative Emission System Leak Detection Pump Control Circuit Low
P2401 Lexus — Evaporative Emission Leak Detection Pump Stuck OFF
P2401 Scion — Evaporative Emission Leak Detection Pump Stuck OFF
P2401 Toyota — Evaporative Emission Leak Detection Pump Stuck OFF
P2401 Volvo — EVAP System Leak Detection Pump Control Circuit Low

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.