Ram 1500

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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
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
40 people reported this problem
Viewing 1 - 10 of 10 comments
Were is it located
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.
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
Replaced leak detection pump. Chech engine light came backb
On about 1000 miles later,cleared dtc. Hasn't been a problem yet
Leak detection pump bad
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
problem not yet fixed.
just came on then my pump fell off. I found out later the wirering housing had melted.
Check engine light vacuum lines clogged