Q: Dodge Neon SE 2003 problem is code P0440

asked by on

hello, my problem is a code P0440 (Dodge Neon SE 2003)the black box and filter replacement(new),diagnostic all code is P0440 and Check Engine Light in instrument panel

The trouble code P0440 means the Evaporative emission control system is malfunction. This malfunction may have been caused by a number of different things including, a loose or missing gas cap, a vacuum leak, a faulty purge valve, an issue with your charcoal canister, incorrect fuel pressure, or electrical issues.

I would recommend having your entire EVAP system inspected by a mechanic who is proficient in diagnosing emissions issues. The most likely cause of this issue is either a loose gas cap or a vacuum leak.

Sometimes the issue is very obvious and may be spotted just by opening the hood. It is possible that a hose may have come loose causing the trouble code to be stored and the Check Engine Light to come on. For a proper diagnosis, consider YourMechanic, as a certified technician from YourMechanic can come to your car’s location to inspect the Check Engine Light and make proper adjustments or repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Dodge Neon SE 2003 problem is code P0440

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Howling sound from front driver side

Hello, It sounds like you may have a failing wheel bearing on the driver side of the vehicle. It is not uncommon for one side to fail prior to the other side. A wheel bearing will usually fail due to...

Q: Stability Light came and Check Engine Light came on. I have a misfire on number 6 plugs.

Your car is equipped with wheel speed sensors at each of the four wheels which monitor wheel speed while relaying this information constantly to the ABS and traction control system which are controlled by the car's ECU. When the ECU...

Q: Hi, I have a 2003 bmw X5 3.0i petrol. 2 problems. 1. abs trifecta lights on, when i plug in my own (cheap) diagnostic tool it onl

Hello and thank you for contacting YourMechanic. The code for your BMW P1619 is referring to the thermostat sensor. Check the thermostat sensor harness for an debris, looseness, and corrosion. If the sensor looks good, then the thermostat needs replaced...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...