LOW
System: EVAP Emissions System
SAE J2012 Standard
P0440: Evaporative Emission System Malfunction
General failure in the evaporative emission control system. The ECM cannot achieve or maintain vacuum during self-diagnostic test.
Driveability & Safety Advisory
Safe to drive. No impact on drivability.
Official Manufacturer TSB Advisories
Toyota T-SB-0021-08
Target: 2004–2008 Toyota Camry / Corolla
Factory Condition: Charcoal canister internal vapor valve leaks.
OEM Service Remedy: Replace charcoal canister assembly.
Physical Component Location & Service Access
Underbody near fuel tank.
Electrical Specifications & Live PID Benchmarks
Scan Tool Live Data Targets
FTP Sensor Voltage:
1.5V at rest
Digital Multimeter (DMM) Specs
Vapor Solenoid Resistance:
18 – 28 Ohms
Documented Model-Specific Case Studies
2005–2010 Toyota Tacoma
Root Cause: Cracked EVAP line.
Verified Fix: Replace hose.
Technician Inspection & Testing Workflow
1
Check gas cap seal.
2
Perform smoke test.
3
Check purge and vent valves.
Cost Breakdown
DIY Replacement Parts:
$15 – $65
Independent Repair Shop (Parts + Labor):
$140 – $300
Standard Diagnostic Time:
1.0 – 2.0 Flat-Rate Hours
Tools & Parts Matrix
Recommended Parts:
Gas cap, Hoses
Required Test Tools:
Smoke machine
Diagnostic Questions & Answers
What is P0440?
It is a general EVAP system trouble code indicating the computer detected an unclassified leak or flow failure.