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2003 Dodge Ram 1500 P0440 OBD2 Code: What It Means and How to Fix It

Model: 2003 Dodge Ram 1500 Fault Code: P0440 Posted: 2010-01-12 21:14

I recently had my 2003 Dodge Ram 1500 inspected at an air care service, and the technician reported a trouble code P044-0. The engine light came on a few days ago, but the truck runs smoothly with no performance issues. I'm wondering what this code means and what could be causing it. I'm located in Mission, BC, Canada—about one hour outside Vancouver—and am looking for reliable information to help diagnose and fix the issue without unnecessary expenses. The vehicle has been maintained well over the years, and I want to ensure I understand the root cause before investing in repairs.

Related fault codes

P0440

Comments (4)

Anonymous 2010-01-13 12:14

Welcome! For a quick starting point, check out http://www.obd-codes.com/p0440 for detailed information on P0440 code explanations and common causes.

Anonymous 2010-12-04 23:06

I'm experiencing the same issue with my 2003 Dodge Ram 1500 Hemi (5.9L), at 47,000 miles. The truck runs perfectly, but it failed the evaporative emissions system test during inspection. The mechanic suggested contacting a dealer to check if the vehicle is still under warranty. I've owned this truck for 7 years and 8 months. Note: Warranty coverage for catalytic converters is 8/80 (8 years), while most other components are covered up to 7/70 (7 years). Should I go ahead with a smoke test and repair, or try to resolve it through the dealer? Any advice would be appreciated. Best regards, Mike, San Diego

Anonymous 2010-12-05 08:59

DTC P0440 is almost always related to the Leak Detection Pump (LDP)—this occurs in about 90% of cases. It's a relatively straightforward issue to diagnose and replace.

Anonymous 2010-12-05 20:31

I agree with Jeff. On this model, the Leak Detection Pump is a very common failure point—especially on Mopar vehicles. Also, don't forget to check your gas cap and its seal. However, to avoid wasting money on unnecessary part replacements, consider paying for one hour of professional diagnostics and having a smoke test performed by an expert. Replacing the wrong component could cost as much as the diagnostic fee itself—so it's wise to get a qualified technician to evaluate the issue first before making any decisions.