What Causes a Truck Not to Consume Diesel Exhaust Fluid (DEF)?

[DelArthur]

Possible reasons include a damaged DEF pump, clogged DEF lines, or a blocked nozzle. Below are relevant details about DEF usage: 1. Actions to take when discovering a truck isn't consuming DEF: If you notice DEF hasn't been consumed or the vehicle's emission warning light is illuminated, it may indicate the SCR system has stopped functioning (commonly referred to as not "burning" DEF). This issue cannot be resolved through DIY methods and requires immediate professional inspection at a 4S service center. Specific causes may include: damaged DEF pump, clogged DEF lines, or blocked nozzles. 2. Consequences of trucks not consuming DEF: Environmental pollution: Operating diesel vehicles without DEF has severe ecological impacts and violates national regulations. Reduced power: While not directly caused by DEF absence, the engine's electronic control system will forcibly limit torque output when it detects no DEF injection and excessive exhaust pollution. SCR system damage: Prolonged DEF absence may cause crystallization blockages or heat damage to SCR system components like nozzles, lines, and the DEF pump.