OBDII Code List

P2401 2004 TOYOTA HIGHLANDER - EVAP System Leak Detection Pump Control Circuit Low

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

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

Tech notes

There is a factory service bulletin for the following Toyota models:

2005–2006 Toyota Corolla
2005–2006 Toyota Matrix
Toyota Corolla, Matrix Factory Service Bulletin OBDII Code P2401

Service bulletin recommends replacing the EVAP Charcoal Canister Assembly to repair the problem.

When is the code detected?

To determine leak criterion (Reference pressure), vacuum pump creates negative pressure in canister pump module through 0.02 inch orifice and pressure is measured. If the conditions are not met, Engine Control Module (ECM) the code will be set.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P2401 2004 Toyota Highlander Description

5 hours after the ignition switch is turned OFF, the electric vacuum pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission) system. The Engine Control Module (ECM) monitors for leaks and actuator malfunctions based on the EVAP pressure.
OBDII Code P2401 2004 Toyota Highlander - EVAP System Leak Detection Pump Control Circuit Low -

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Related Information

P2401 2004 TOYOTA HIGHLANDER Comments

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