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2000 Dodge Stratus EVAP Leak: How Common Are 442 and 455 DTCs After LDP Replacement?

Model: 2000 Dodge Stratus Fault Code: P2177 Posted: 2007-08-04 08:36

The vehicle initially triggered a P0442 EVAP system leak code. A gas cap replacement did not resolve the issue. The mechanic then removed the fuel tank, replaced the Liquid Detection Pump (LDP), and after one week to reset the monitor, the code shifted to P0455 — indicating a larger evaporative system leak. The dealer suggested that the LDP is typically the source of such issues, rather than the canister or valves. However, the vehicle has not been returned for further inspection. Given that the LDP was already replaced, how common are leaks in other EVAP components (such as hoses and clamps)? Are there known failure points beyond simple hose cracks or loose connections?

Related fault codes

P2177

Comments (4)

Anonymous 2007-08-06 14:41

Since the LDP has been replaced, it's important to conduct a thorough inspection of the entire EVAP system for potential leaks. Dealerships often see fewer cases than independent mechanics, so their advice should be taken with caution. A cracked hose is a common issue — especially one that may have been stressed during fuel tank removal. Run your hands along all hoses and consider blowing air through them while listening for hissing sounds. Also check for damaged o-rings or worn seals.

Anonymous 2007-08-07 05:41

I recently noticed some rust on the filler neck during a quick visual inspection. I reviewed several articles from 'Motor' magazine about EVAP leak diagnostics and found that nitrogen is more effective than smoke or air for detecting leaks. Ultrasonic and UV detectors are also recommended — one small leak (0.02 inches) can be detected individually, but multiple smaller leaks totaling 0.02 inches may go unnoticed without proper detection tools.

Anonymous 2007-08-07 10:52

I agree that smoke machines and ultrasonic detectors are helpful, but not essential for identifying EVAP system leaks. They can be costly and aren't always necessary. If you understand how the EVAP system works — including its flow paths and pressure dynamics — you can often locate leaks through hands-on inspection. Simply pull the fuel tank, apply pressure, listen carefully, visually inspect all connections, and feel for temperature changes or vibrations. With proper knowledge, even a small leak will be detectable.

Anonymous 2007-08-09 10:31

Use a smoke machine — I do this daily at my Chrysler dealership. Without it, diagnosing EVAP leaks becomes extremely time-consuming and labor-intensive. The LDP operates continuously in these vehicles, making it the most common cause of P0440 codes. However, after replacing the LDP and still seeing leak codes, ensure all connections are properly secured and retested. A smoke test is a reliable way to confirm whether the system is fully sealed.