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2001 Town & Country P0455 Code: Large EVAP System Leak - Diagnosis and Fixes

Model: 2001 Town & Country Fault Code: P0455 Posted: 2016-07-19 09:27

I own a 2001 Chrysler Town & Country with a persistent P0455 diagnostic code indicating a large evaporative emission system leak. I've already replaced the gas cap, which reset the code temporarily—only for it to return. I then replaced the purge valve under the hood and performed another reset, but the code reappeared. After thorough inspection of all hoses and connections, no visible leaks were found. I'm now wondering if there's a common issue specific to this model year or if I'm missing a key step in the diagnosis. Since I have an upcoming inspection, I need a reliable solution before then. Any insights into potential causes or testing methods for this vehicle would be greatly appreciated.

Related fault codes
P0455
Comments (5)
Anonymous 2016-07-19 10:13

If no other diagnostic codes are present, the most effective method is to perform a 'smoke' test on the EVAP system. The smoke helps technicians visually identify the exact location of any leaks.

Anonymous 2016-07-19 10:52

I forgot to mention that I've already had two shops inspect the vehicle—both concluded it was a faulty gas cap, but after replacing it, the code returned. This suggests the issue may lie elsewhere in the system.

Anonymous 2016-07-19 11:19

The P0455 code indicates a leak, so confirming the source is essential. A smoke test would help pinpoint leaks—especially if the gas cap is leaking, the smoke would be visible at that point. Could you confirm which valve under the hood was replaced? Also, double-checking the LDP (Liquid Detection Pump) might be worth considering.

Anonymous 2016-07-19 12:08

I replaced the purge valve located under the hood. However, I'm not entirely sure where the fuel pump assembly pump is located—could someone clarify that for me?

Anonymous 2016-08-28 14:08

I experienced a P0455 code on my own 2001 Caravan, and it was ultimately caused by rust in the steel locking ring of the fuel pump assembly, which led to cracking at the top of the fuel pump. This is a known issue in older models and may be relevant for your vehicle as well.