AutoCodes - Toyota - P0440 TOYOTA

P0440 TOYOTA Code - Evaporative Emission Control System Malfunction

Repair Importance Level: 1/3
Repair Difficulty Level: 3/3
Table of contents

|P0440 TOYOTA code possible causes

  • Missing or loose fuel cap
  • Incorrect fuel filler cap used
  • Fuel filler cap remains open or fails to close
  • Foreign matter caught in fuel filler cap
  • EVAP canister or fuel tank leaks
  • EVAP system hose leaking
  • Fuel tank leaking

|How do I fix the P0440 TOYOTA code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|P0440 TOYOTA code tech notes

The P0440 code means that the control module has detected a leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause that triggers the P0440 code.

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

2003–2004 Toyota Corolla
2003–2005 Toyota Matrix
Toyota Factory Service Bulletin OBDII Code P0440 Corolla and Matrix


If P0440 is combined with P0446 and P0441 use this bulletin:
2000-2003 Toyota Solara
2000-2003 Toyota Avalon
2000-2003 Toyota Camry
2001-2003 Toyota Sienna
Toyota Factory Service Bulletin OBDII Code P0440 Solara, Avalon, Camry, Sienna

|Cost of diagnosing the P0440 TOYOTA code

Labor: 1.0

The cost of diagnosing the P0440 TOYOTA code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0440 TOYOTA code detected?

Malfunction is detected when EVAP control system has a leak, EVAP control system does not operate properly.

|What are P0440 TOYOTA code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible a noticeable fuel odor caused by the release of fuel vapors

|P0440 TOYOTA code description

The Engine Control Module (ECM) tests the Evaporative Emission (EVAP) system for the following conditions:
- Large and small leaks
- Excess vacuum
- Purge flow during non-commanded conditions
- Fuel Level and Fuel Pressure sensor faults
- EVAP Purge and Vent Valve faults
The ECM monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The ECM commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions are met in order to apply an engine vacuum to the EVAP system. The ECM commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. This test verifies if a vacuum can be achieved in the EVAP system. Failure to develop a vacuum may be caused by a large leak or a restriction.
OBDII Code P0440 Toyota - Evaporative Emission Control System Malfunction - AutoCodes.com

|Need more information with the P0440 TOYOTA code?

Need more information on how to fix the P0440 TOYOTA code? Get Access to Factory Service Manuals

|Need help with a P0440 TOYOTA code?

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|P0440 TOYOTA code comments

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