OBD II P0440 Error Code Explained
By its full name OBD code p0440 is an indication, a symptom that something is happening to your vehicle’s EVAP system.
For those who don’t have so much experience in the mechanical field, EVAP stands for Evaporative Emissions, including components like fuel tank, gas cap, canister purge and vent solenoid, the storage carbon canister, and the fuel tank pressure sensor.
On short and in a simple formulation, this is the system that impedes fuel vapors to reach the atmosphere so p0440 is the code that alerts drivers that functioning properly with this system. And the functionality of this code indicating that something is happening with your vehicle doesn’t stop here. It can also be a sign that your car is experiencing a major leak.
How p0440 Is Detected
This particular code is signaled to drivers by the illumination of the Check Engine Light. If that weren’t the case and drivers wouldn’t receive such a straightforward signal they might not even be aware of some dysfunctional situation because in most cases no drive-ability problems appear.
There might be noticeable just a faint fuel odor coming from the EVAP system. This means that fuel vapors are released into the atmosphere instead of heading to the engine as they would normally do for creating the combustion process. So if this unparticular smell appears in your car don’t ignore it because it’s a symptom of the P0440 code.
The most common factors that make the Check Engine Light illuminate and attention drivers about this code are:
- Improperly installed fuel cap,
- absence of fuel cap or any other damages of this component,
- the storage carbon canister is damaged/split or plugged,
- the purge solenoid is failing,
- the fuel tank presents a defection,
- the evaporation vent/purge valves are defective,
- the fuel tank sending unit gasket presents a defection,
- and torn EVAP hose.
What to Do in Case of p0440
One simple thing to perform is to write down the freeze frame information, which is obtained after retrieving the code. This is for ensuring the baseline of any repairs that are going to take place.
The first solution and the most simple of all is to remove the fuel cap, to install it correctly and with care, clear the code and then after driving for a day check if the light illuminates again. If it does then the fuel cap is not damaged and it is correctly installed. So it’s time for another step implying a thorough inspection of the EVAP system for any holes, misplacement’s or cuts in hoses. Other possible solutions might be the replacement of the purge valve or of the sensor.
These were only the simple solution that can be handled by everyone, not only a professional mechanic. To test for leaks drivers have to turn to a professional who will use a smoke machine to see if there are any. Or he will use specialized software to check the decaying rate for the vacuum. There is a leak when it decays much faster so it means that the p0440 is enforceable, which also leads us to the conclusion that sometimes is better to have professional people handling your vehicle.
Incoming search terms:
- p0440 (910)
- TroubleCodep0440 OBD2help|OBDIICodes (87)
- po440 check engine light (85)
- Po440 (81)
- p0440 code (74)
- yhs-fh_lsonsw (58)
- p0440 trouble code (42)
- obd code p0440 (33)
- evap code (29)
- po440 code (25)
- yhs-fullyhosted_003 (22)
- Check Engine Light Code P0440 (19)
- Po440 Code GM (18)
- error code p0440 (16)
- evap code p0440 (15)
- code po440 (15)
- gm code po440 (14)
- Check engine light evap code (12)
- check engine code p0440 (11)
- Trouble code P0440 (10)
- EVAP CODES (10)
- GM Trouble Code Po440 (8)
- GM Trouble Codes P0440 (7)
- yhsm-imp1 (6)
- code po 440 (6)
- po44o (5)
- Code Po440 Check Engine Light (5)
- po440 evaporative emission system (5)
- Check Engine Light Code Po440 (5)
- Check Engine P0440 (4)
- po440 trouble code (4)
- po440 engine code (3)
- p0440 p obd2 code meaning (3)
- gm code p0440 fix (3)
- car code p0440 (3)
- evap (3)
- check engine light code 0440 (3)
- code p0440 p0442 check engine light on (3)
- dodge trouble code p440 (2)
- engine light on in 99 buick 0440 evap code (2)
- 0440 (2)
- evap on obd scanner (2)
- gm 5 3 p0440 engine code (2)
- troubleshooting p0440 (2)
- Saturn error code po440 (2)
- po44o code (2)
- p0440 whining noise near gas tank valve (2)
- odb code readers (2)
- mazda mpv p0440 (2)
- how to clear code p0440 (2)