The Garage - Repairs
P0455 Evap Leak!

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Last Updated: 12/3/2013
Evap Fix

RockAuto, LLC
6680 Odana Road
Madison, WI 53719
Phone: 608-661-1376
Fax: 608-836-5694
Toll-Free: 866-762-5288

Click here to visit their website.

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06-01-2010 - My Check Engine Light (CEL) in the Durango came on yesterday. After pulling the code with my OBD-II reader, it turned out to be a P0455 which is a leak in the Evaporative Emission Control System. As with any system it is important to understand the basics in order to be able to diagnose problems. The purpose of the EVAP system is to minimize the amount of fuel vapors entering the atmosphere.

Here are a few EVAP codes which can be encountered with the Durango:

P0442 Medium EVAP Leak
P0455 Large EVAP Leak
P1480 PCV Solenoid Valve Open Or Shorted
P1480 Open Or Shorted Condition Detected In The Positive Crankcase Ventilation (PCV)
P1486 Evap Leak Monitor Pinched Hose

The fuel vapors in the EVAP system are stored in a charcoal canister to be purged and burned in the combustion chamber at certain operating conditions. The system is designed to use the fuel vapors by pulling them from the canister with the use of a purge solenoid.

With the OBD II self monitoring system, tests are ran by the vehicles PCM (Powertrain Control Module) to insure the EVAP system is functioning as it was designed. If the PCM sees test results outside certain pre-determined parameters or limits a DTC (Diagnostic Trouble Code) will be set causing the CEL (Check Engine Light) warning to appear in the instrument cluster alerting the driver of a malfunction in the Durango.

Diagnosing the cause for an EVAP (evaporative system) leak code that has been set can be one of the most frustrating jobs any tech can face. Unless the fuel cap was left loose or doesn't seal properly, or a quick visual inspection reveals a cracked or disconnected vapor hose, diagnosing the EVAP system for vapor leaks is usually a very time consuming task.

I got lucky and do the knowledge gained having the same issue previously discovered in the Durango's life, I knew where to look first.

I was right on the money with my assumption and it turned out to be again the U shaped hose which I had replaced about 2 years ago. It is connected to the charcoal canister which is located under the truck just a bit behind the driver side door. It had a large rip right there were it goes onto the plastic tubing of the canister.

It's DORMAN Part # 46020 and avail. from RockAuto for about 6 bucks shipped!

Good thing that two years ago I was smart enough to order two sets instead of just the one needed at the time, thus I had another hose kit in my spare parts box.

All in all it took about 30 minutes (with the help of the little expert next to me in the picture) to replace the hose including jacking the truck up, clearing the code, and cleaning up afterwards. Time to order another spare kit!

Oh, almost forgot, I also replaced all the hoses leading to and from the purge solenoid as well, just in case.
Now when I remove the gas cap, I can clearly here the zishh!

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