Question about 2003 Jeep Grand Cherokee

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Chrysler 300m with a check engine light on.

The code comes back as p0455. What does that mean and what is the solution.

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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.

Posted on Jan 09, 2009

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Evap system large leak. either a leak in one of the evap lines or possibly gas cap loose

Posted on Jan 09, 2009

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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.
Symptoms You likely won't notice any drivability problems.
Causes 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
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  • 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

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