P0440
Low SeverityEVAP System Malfunction
EVAP System
P0440 — Instant Answer
EVAP System Malfunction
Severity: LOW SEVERITY
Meaning: General EVAP system fault — the system that captures fuel vapors is not working properly.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $5 - $15
Most common causes:
- 1. Loose or cracked gas cap (35-45% of cases)
- 2. EVAP canister purge valve fault (10-25% of cases)
- 3. EVAP vent valve fault (10-25% of cases)
- 4. Cracked EVAP hose (10-25% of cases)
Symptoms
- ⚠️Check engine light
- ⚠️Faint fuel smell possible
- ⚠️Failed emissions test
Related Symptoms
Common Causes
How to Diagnose P0440
- 1Tighten gas cap and clear code
- 2If code returns, inspect gas cap seal
- 3Check purge and vent valves
- 4Smoke test EVAP system
OEM Procedures for P0440
P0440 affects the Charcoal Canister. Found 2 OEM service manual procedures.
Charcoal Canister - Replacement (ES300)
Charcoal Canister - Replacement (ES300)
Charcoal Canister - Replacement (ES300)
Charcoal Canister - Replacement (ES300)
Charcoal Canister - Replacement (ES300)
Charcoal Canister - Replacement (ES300)
Charcoal Canister - Replacement (ES300)
Charcoal Canister - Replacement (ES300)
OEM Diagnostic Flowchart
Scroll to load technician if/then branches.
Read live data and freeze frame for P0440 to pinpoint the cause before buying parts.
TopScan
$51.27
DIYers who want phone-based scanning
View on TOPDON
ArtiLink600
$99
DIYers working on ABS/airbag systems
View on TOPDONGot a repair estimate for P0440? Check if the quote is fair before ordering parts.
Parts & Tools for This Job
Common parts shoppers buy for P0440 EVAP System Malfunction.
Oxygen Sensor
Shop Amazon→
Catalytic Converter
Shop Amazon→
EVAP Purge Valve
Shop Amazon→
Gas Cap
Shop Amazon→
As an Amazon Associate, AllOEMManuals earns from qualifying purchases. Prices and availability may vary.
Turn This Into a Confident Next Step
Verify the likely fault first, then compare a quote before you approve expensive work.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
View factory recommended tools
OBD2 scanner
Read codes and freeze-frame data before you guess at the fault.
Most diagnostic jobs start with a scan tool and a verified code path.
Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
Check SpecificationsRelated Resources
Repair guides, symptom pages, and wiring diagrams related to P0440.
OEM Manual Evidence
Browse →A L L Diagnostic Trouble Codes ( DTC ) — 2013 Chrysler 200 L4-2.4L Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagine...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 Chrysler 200 V6-3.6L Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagine...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 Dodge and Ram Avenger L4-2.4L Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 Dodge and Ram Avenger V6-3.6L Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge...
Related Symptoms
Browse →Exact Vehicle Hubs
Browse →Open the exact vehicle hub grounded by OEM manual evidence related to P0440.
Open the exact vehicle hub grounded by OEM manual evidence related to P0440.
Open the exact vehicle hub grounded by OEM manual evidence related to P0440.
Open the exact vehicle hub grounded by OEM manual evidence related to P0440.
Related Codes
The EVAP purge flow is not within expected range.
A small leak in the EVAP system, often a deteriorated gas cap seal or a tiny crack in a hose.
A significant leak in the EVAP system. Often a loose gas cap or a disconnected hose.
Frequently Asked Questions
- What is the EVAP system?
- The EVAP system captures fuel vapors from the tank and routes them to the engine to be burned, preventing pollution.
- Can a loose gas cap cause P0440?
- Yes — the #1 cause of EVAP codes is a loose, cracked, or missing gas cap. Tighten it and clear the code.
Get the Complete Maintenance Schedule for P0440 drivers
Oil, filters, belts, brakes, and fluid intervals sent to your inbox. Unsubscribe anytime.
Not sure you want to DIY? Compare local shop pricing first.
Author & Review
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-10-29