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.
Problems for specific Dodge Ram 3500 years:
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Most reported 2003 Dodge Ram 3500 problems
If the transmission delays initial gear engagement after being parked overnight or longer, it may be due to a suspect transmission cooler return filter. If the transmission was recently serviced and the part number for the cooler return filter contains an "AB" suffix at the end, a new filter should be installed.
The throttle body may malfunction in very cold climates causing symptoms at engine start up. A throttle body causing problems will require replacement.
A new overrunning alternator pulley often helps with drive belt squealing or fraying. Pulley alignment should also be inspected when the belt frays or squeals.
The track for the power seat may need to be replaced if the seat rocks when the vehicle accelerates or slows down.
A revised return spring is available if the cup holder binds or is slow to open.
A new lower secondary door seal is available if clothing is getting dirty when entering or exiting the truck. Dirt or mud may build up on the rocker panel below the door.