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P0440 OBD-II Trouble Code: Evaporative Emission Control System Malfunction
P0440 P0440 code definition Evaporative Emission Control System Malfunction What the P0440 code means P0440 is an OBD-II generic code that the engine control module (ECM) has detected a leak in the fuel tank vapor system or a vapor pressure...

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Why is it still misfiring?

Hi there. Check the Exhaust Gas Recirculation (https://www.yourmechanic.com/services/exhaust-gas-recirculation-egr-valve-replacement) valve on the engine. It seems to be sticking on when the engine is running at low idle and causing a misfire as the old exhaust that is burnt is reentering the...

Car keeps stalling while driving. Scan said no flow during purge, code P0440

Hey there. A faulted purge solenoid may cause some problems, but is not likely the cause for the vehicle stalling. The camshaft (https://www.yourmechanic.com/services/camshaft-position-sensor-replacement) or crankshaft position sensor (https://www.yourmechanic.com/services/crankshaft-position-sensor-replacement) is a common failure item on these vehicles and does not always...

Check engine light is on with code P0440. Also the car makes noise

Hi there, thanks for writing in. This code (https://www.yourmechanic.com/article/p0440-obd-ii-trouble-code-evaporative-emission-control-system-malfunction-by-jay-safford_2) is for a leak or failure in the evap emissions system. By far the most common cause of this is a bad gas cap (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-gas-cap). If the seal on the cap...

Gas tank door burnt black.

The most common cause for a P0440 code (https://www.yourmechanic.com/article/p0440-obd-ii-trouble-code-evaporative-emission-control-system-malfunction-by-jay-safford_2) is the fuel cap seal. I suggest making sure that the fuel cap is tight by turning until it clicks. If you are sure that your fuel cap was tight, replace...

was getting PO440 CODE.

These valves (https://www.yourmechanic.com/services/evaporation-vent-solenoid-replacement) are controlled by the PCM so the circuit will not be closed until commanded by the PCM and that closure can be through the ground side. If the circuit is competed through the ground side, you will...

Problem with emission control code P0440 Check Engine Light. Is that a major problem and how do you fix?

Hi there, A P0440 code (https://www.yourmechanic.com/article/p0440-obd-ii-trouble-code-evaporative-emission-control-system-malfunction-by-jay-safford_2) is stored for an emission related fault; evaporative emission control malfunction. The evaporative emission system is responsible for preventing the release of fuel vapor into the atmosphere. When there is a fault in the...

Dodge Neon SE 2003 problem is code P0440

The trouble code P0440 (https://www.yourmechanic.com/article/p0440-obd-ii-trouble-code-evaporative-emission-control-system-malfunction-by-jay-safford_2) 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 (https://www.yourmechanic.com/services/gas-cap-replacement), a vacuum leak (https://www.yourmechanic.com/article/is-it-safe-to-drive-with-a-vacuum-leak), a faulty purge...

Check engine Light appears

Hello. The P0440 code (https://www.yourmechanic.com/article/p0440-obd-ii-trouble-code-evaporative-emission-control-system-malfunction-by-jay-safford_2) you are getting is for an EVAP system problem. This code is generic so the system needs to be checked. Most of the time it is because of a system leak such as a fuel...

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