Wen ever i go through puddles in my neon the engin light will go on i have to take the ground off of the battery n sumtimes that wont even work if its been on for over 100 miles n u try alot check the computer
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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.
This is an evaporative emmisions - small leak detected. Sometimes caused by fueling with the engine running (the fuel cap has to seal the fuel tank for the pressure sensor to read correctly), but can be a leak at the evaporative canister, Check valve on top of the fuel tank cracked and a host of other components, fittings or leak points. Best bet is to have a diagnostic done by a shop which should include pressurizing lines, etc.
Below are the possible causes for your engine light and error code:
EVAP fuel tank or canister vapor hoses leaking or damaged
EVAP system component leaking, fuel cap loose or missing
Leak detection pump damaged or leaking
The fuel cap is probably the most common cause of this problem. It's considered part of the emission system and if faulty or not place on the filler tube correctly, it will throw an error. Best of luck with your engine light issue. Take care! Greg
I have the same failure that occurred when smogging my Ford Ranger. The EVAP test was just added a couple of years ago and it tests for leaks in the gas tank vapor recovery system. What this is a system of vapor recovery lines that connect from the gas tank and goes to a canister then returns to the intake and on the next engine start and gets used, instead of leaking into the air.
The only issue is these lines can develop a leak at any of the connection points or along the rubber portions and can be a pain to replace depending on your application. So until you fix the leak you will fail this test since they pressurize the system and if there is a leak it won't hold the pressure.