Check Engine Light Due to Pinched Leak Detection Pump Vacuum Lines on Dodge Ram 1500

If a Check Engine Light illuminates indicating leak detection pump (LDP) failure, the cause is often pinched or disconnected vacuum lines to the pump. Vacuum lines should be inspected before replacing the leak detection pump. Contamination (carbon or debris) in the pump can cause failure and any hoses should be cleared before a new pump is installed.

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Average mileage: 117,313 (25,000–200,000)
Exhaust & Emissions affected: Gasoline
14 model years affected: 1994, 1995, 1996, 1997, more1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
33 people reported this problem
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Viewing 1 - 10 of 10 problem details
2004 Dodge Ram 1500 170,000 mi,
Check engine light came on with code P0456 (Emission leak- EVAP system small leak). Gas cap is tight. I have not had a chance to inspect vacuum system.
2002 Dodge Ram 1500 79,478 mi,
engine light on but runs fine heard a hissing under the truck and found two air lines cracked and part of the line missing when I took the lines off the crumbled in my hand much like my dash board I replace the lines and the light went out
Was informed I needed a NVLD pump and a PCV valve. Total maintainance $250
2002 Dodge Ram 1500 90,000 mi,
Replaced leak detection pump. Chech engine light came backb On about 1000 miles later,cleared dtc. Hasn't been a problem yet
2003 Dodge Ram 1500 127,000 mi,
light has been on since 52000 miles cannot find the problem replaced th module and went off for a while then came back had checked and fuel system still a problem dodge would not fix because had just went out of warranty. feel it is there problem and they should still fix
2003 Dodge Ram 1500 25,000 mi,
problem not yet fixed.
2004 Dodge Ram 1500 80,000 mi,
just came on then my pump fell off. I found out later the wirering housing had melted.
Check engine light vacuum lines clogged