If the code persists after basic maintenance, a dealer technician will use the CNH Electronic Service Tool (EST) to perform a "static dosing test." This test manually activates the pump to measure the exact pressure output (typically around 9 bar or 130 psi). If the pump runs but cannot build pressure, the internal supply module likely requires replacement.
Look for white, crusty buildup around the DEF injector and the pump connections. Clean these areas with warm distilled water. New Holland 3297 Error Code
Damage to the suction or pressure lines prevents fluid from reaching the injector. If the code persists after basic maintenance, a
The supply module contains a small filter that can clog with crystallized urea or debris. New Holland 3297 Error Code