P0455 = EVAP LEAK MONITOR LARGE LEAK DETECTED. I am not sure if you are talking about a Jeep Grand Cherokee or a Chrysler 300M but the code is the same for all cars. This code referes to the gas vapor system on the vehice. Cars today take the gas vapor and instead of venting to the atmosphere they store and re-direct these gases back to the engine to be burned. The EPA mandated that the cars computer test the system for leaks. It does this with a series of valves to seal the system then depending on the system creates pressure and watches for a drop in pressure over a certian amount of time. If it drops too fast the P0455 code is stored and the check engine light comes on. I will tell you that these types of codes even for me take a while to find. There are however usually 3 things that can be the problem. The Natural vaccum leack dection pump, a bad or leaking hose in the system, or the purge valve. You might be better off taking it to a mechanic you can trust to have checked out.
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code p0455 refers to evaporative emission (EVAP) system--large leak detected===causes--hose connection/s--intake leak---EVAP cannister--EVAP canister purge valve
first check that the filler cap is on correctly ,tight and sealing
thak you for all the info as it helps me alot in helping you ...
this 2001 300m with a 3.5 engine is throwing code po171 bank 1 running lean. the first thing to look for is vacuum leaks or loose intake boot..check for dirty mass air flow sensor and last would be to look at the o2 sensors, i scan tool will be needed for this and you will need to add fuel or cause a vac leak to see how the o2 sensors respond to it
Hello, my engine light was on for a VERY LONG time and everytime I got it checked no one could tell me what the problem was because things always checked out fine. The "code" says its a loose gas cap or something, but it wasnt that. My 300M also was having A HARD TIME STARTING UP for about 8 months and leaking coolant for about a month. I finally found a mechanic who knew what he was doing; 1. Leaking Radiator 2. Coolant found in #2 or #3 cylinder. The cause of this was a busted HEAD GASKET. If your 300M has trouble starting and the Engine light stays on have a mechanic check your engine for a busted head gasket and see if all your cylinders are firing correctly. I had to pay $2600 for a new Head Gasket, Radiator and all new hoses plus labor. CRYING!!!!!!!!!!
I have a 2001 300M 130K - very well kept. Stuff happens...
Have you had it reset and it still comes on? there are 8 different systems that need to be monitered, just because it passes emissions doesnt mean you dont have a problem, have someone run the obd2 scanner on it to pull your codes, if nothing comes up , have them cleared and see if the light comes back on.
i have a 2002 300m and my check e light came on 2 days ago i ttook it to a mechanic in dallas and he told me it would be 500 to fix it so i took it to autozone to have them put the free dianostics test and it ended up being the gas lid not on properly they said it was common on this model they reset my battery for me and my light is still off today
P0455 - Evaporative Emission Control System Leak Detected (no purge flow
or large leak)
What does that mean?
This indicates a fuel vapor leak or lack of purge flow in the EVAP control
system. It means a large leak has been detected. The (EVAP) emission control
system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel
vapors are routed by hoses to a charcoal canister for storage. Later, when the
engine is running a purge control valve opens allowing intake vacuum to siphon
the fuel vapors into the engine.
You likely won't notice any drivability problems.
A code p0455 most likely means one or more of the following has happened:
A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
Other leak or damaged piece in EVAP system
With a p0455, the most common repair is to:
Remove and reinstall the gas cap, clear the codes, and drive for a day and
see if the codes come back.
Otherwise, replace the gas cap, and/or
Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum
noise or smell fuel), repair if necessary