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P0440

Overview

Code

P0440

Code Type

P

Code Class

P0

System

Emissions

Severity Level

Low

Emissions Related

true

Drivability Impact

None

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0440 indicates a general malfunction in the evaporative emission control (EVAP) system

Symptoms

Check Engine Light illuminated

Overview applies to this diagnostic code.

Affected Systems

On This Page

  • Code Definition

  • Symptoms

  • Affected Systems

  • Possible Causes

  • Diagnostic Steps

  • Drive Safety Notes​

More Resources

The EVAP system prevents fuel vapors from escaping into the atmosphere

Possible Causes

Loose or damaged gas cap; EVAP hose leaks; Faulty purge or vent valve

Diagnostic Steps

1 Inspect gas cap condition; 2 Check EVAP hoses for leaks; 3 Test purge and vent valves

Drive Safety Notes

Driving is safe, but emissions will increase

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