Diagnosing A Urea Module That Is Exposed To Diesel Fuel
This bulletin involves discussing what will happen to the rubber material used in the urea
pump when exposed to diesel fuel.
This unit is sometimes referred to as the Selective Catalyst Reductant (SCR) module or
the Adblue Delivery Module (ADM). Units exposed to hydrocarbons have a particular
failure mode, the rubber heater unit is crinkled and in some cases the metal heater
protrudes through the rubber membrane.
The rubber material used in this unit is designed to withstand Diesel Exhaust Fluid (DEF)
only. Exposure to fluids that contain hydrocarbons (i.e. diesel fuel) will damage the unit
beyond repair. Units returned that exhibit this failure mode will have warranty claims that
Units that exhibit this failure mode should be considered customer abuse and should not
be covered under warranty. Use the Hydroscopic test paper (P/N 223-44-863) available
through MoparEssentialTools.com to confirm exposure.