P0440 Mitsubishi Code - EVAP Control System Malfunction
Quick Answer
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. Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
- What it means
- P0440 Mitsubishi indicates EVAP Control System Malfunction.
- Common causes
- Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close.
- Severity
- Low - monitor the vehicle and repair when practical.
- Can I drive?
- The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
Code P0440 Mitsubishi Description
- 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.
What are the Possible Causes of the DTC P0440 Mitsubishi?
- 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 to Fix the DTC P0440 Mitsubishi?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0440 Mitsubishi code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0440 Mitsubishi code?
Need more information on how to fix the P0440 Mitsubishi code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0440 Mitsubishi code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0440 Mitsubishi Code
1. What are common symptoms of OBDII code P0440 in a Mitsubishi related to the EVAP control system malfunction?
- Common symptoms include the check engine light illuminating, a strong fuel odor, and possible issues with vehicle performance.
2. What are the possible causes of OBDII code P0440 in a Mitsubishi?
- The code P0440 in a Mitsubishi may be triggered by a loose gas cap, a faulty EVAP system purge valve, a leak in the EVAP system, or a malfunctioning charcoal canister.
3. How can I diagnose the source of the EVAP control system malfunction triggering OBDII code P0440 in my Mitsubishi?
- Diagnosing the issue may involve checking the gas cap for tightness, inspecting the EVAP system components for leaks, and using a scan tool to monitor the EVAP system operation.
4. Can a loose gas cap really cause OBDII code P0440 in a Mitsubishi?
- Yes, a loose or improperly sealed gas cap can lead to a drop in system pressure, triggering the OBDII code P0440 related to the EVAP control system malfunction in a Mitsubishi.
5. Is it safe to continue driving my Mitsubishi with OBDII code P0440 indicating an EVAP control system malfunction?
- While the vehicle may still be safe to drive, it is recommended to address the issue promptly to prevent potential fuel leaks, emissions problems, or damage to other components.
6. How can I repair OBDII code P0440 in my Mitsubishi caused by a faulty EVAP system purge valve?
- To repair P0440 due to a bad purge valve, you may need to replace the faulty component with a new one following the manufacturer's recommended procedures.
7. What are some general tips for repairing a leak in the EVAP system that is causing OBDII code P0440 in a Mitsubishi?
- Repairing a leak in the EVAP system may involve visually inspecting the components for damage, replacing or repairing the affected parts, and testing the system to ensure proper function.
8. Can a clogged charcoal canister trigger OBDII code P0440 in a Mitsubishi?
- Yes, a clogged charcoal canister can restrict the flow of vapor through the EVAP system, leading to a malfunction and triggering the OBDII code P0440 in a Mitsubishi.
9. How long does it typically take to repair OBDII code P0440 related to an EVAP control system malfunction in a Mitsubishi?
- The repair time for OBDII code P0440 can vary depending on the specific cause of the issue, but it may take anywhere from 30 minutes to a few hours to diagnose and fix the problem.
10. Can resetting the check engine light temporarily resolve OBDII code P0440 in a Mitsubishi?
- Resetting the check engine light may temporarily turn it off, but if the underlying issue causing OBDII code P0440 is not addressed, the light is likely to come back on once the problem is detected again.
Discuss the causes and fixes for P0440 Mitsubishi OBDII Code
Code P0440 Mitsubishi comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
