The internal diaphragm or motor in the supply module may have reached the end of its life.
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. New Holland 3297 Error Code
Ensure the tank is at least 25% full. Use a refractometer to verify the DEF is at the standard 32.5% urea concentration. The internal diaphragm or motor in the supply
Look for white, crusty buildup around the DEF injector and the pump connections. Clean these areas with warm distilled water. Ensure the tank is at least 25% full
Damage to the suction or pressure lines prevents fluid from reaching the injector.
If operating in freezing temperatures, move the machine to a heated shop for several hours to ensure no ice is present in the lines.
A build-up of crystallized DEF at the nozzle tip can create back-pressure or blockage.