P0456 - Evaporative Emissions System - Small leak detected
The Powertrain Control Module (PCM) at different times performs various tests on the EVAP system. OBD II Enhanced EVAP systems are in place to keep fuel tank vapors from venting into the atmosphere, and instead purges them into the engine to be burned. Regular pressure tests are conducted by the PCM to monitor the sealed system for leaks. The PCM monitors the EVAP system pressure by watching the fuel tank pressure (FTP) sensor. When the sensor indicates a small leak in the EVAP system, this code is set.
Potential Symptoms: There will likely be no noticeable symptoms other than the Malfunction Indicator Lamp (MIL). This is because the EVAP system is a closed system and only controls fuel tank vapors, not engine management.
Causes: Usually this P0456 code is caused by an incorrect or faulty gas cap. Filling the fuel tank with the engine running could conceivable cause this code as well or if the cap wasn't properly tightened. Any of the following could also be the cause:
A small leak in any of the EVAP hoses or fuel tank hoses
A small leak in the purge valve or vent valve
The EVAP Canister may be leaking
Possible Solutions:
First, using a scan tool activate the vent solenoid, sealing the system. Then monitor the fuel tank pressure (FTP) sensor. If the system is sealing properly, the number will stay consistent. If is isn't, the pressure sensor will show that as well. If the system slowly leaks, use a smoke machine and watch for smoke exiting the system at any EVAP component. Any where there is smoke exiting the system, that is the faulty component. Do not pressurize the EVAP system with air pressure. Doing so can damage the purge and vent solenoids in the system.
Hope this helps.
SOURCE: 2001 Dodge Caravan/check engine light
Leak in evap, most of time the gas cap was not put back on.
SOURCE: 2001 Dodge Caravan/check engine light
Is your gas cap tight? check it, these codes indicate a large leak in the fuel evaporative emission recovery system at the gas tank
SOURCE: Evap leak
your caravan has a system to control fumes from the gas tank .. any evaporating fuel is absorbed into a canister .. that is connected to a evap/purge solenoid in the engine compartment that directs the fumes to be burned in the engine once its running .. .. the problem can be as simple as a damaged or leaking or wrong type gas cap .. if the gas cap doesnt seal well then air can be drawn into the evaporitive control system ... also if any of the hoses from the evap/purge solenoid to the canister (located near the gas tank) are cracked or loose, you will get the same results .. some of these hoses are rubber .. some are hard plastic .. sometimes they come loose at the canister and need a clamp added ... the evap/purge solenoid could also be bad but much more likely the gas cap is just bad, bent or wrong ..
SOURCE: 2002 dodge caravan code coming up on read out
that is the evap. usally a bad seal on the gas cap or the goose neck to the tank
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