Why is the truck not consuming urea solution?

[Stone]

If it is found that the vehicle urea has not been consumed, or when the vehicle emission light comes on, it may indicate that the SCR system is not functioning. In such cases, it is advisable to immediately visit a professional 4S shop for inspection and repair. The specific reasons could be damage to the urea pump, blockage of the urea pipeline, or nozzle clogging. The hazards of trucks not using urea are as follows: 1. Environmental pollution: Diesel vehicles not using urea can have extremely adverse effects on the ecological environment, which is not permitted by national laws and regulations. 2. Reduced power: This is not a direct consequence of not using vehicle urea, but when the engine's electronic control system detects no urea injection and excessive tailpipe pollution, it will forcibly limit the engine's torque output. 3. Damage to the SCR injection system: If urea is not used for a long time, the nozzles, pipelines, and urea pump in the SCR system may crystallize and become blocked, or be damaged due to high temperatures.

[VonDavid]

I've been driving heavy trucks for over a decade and have encountered many cases where large vehicles don't consume urea solution, which usually indicates an SCR system malfunction. Common issues include a stuck urea pump that fails to operate, nozzles clogged with impurities preventing spray, or faulty sensors misjudging fluid levels. Urea solution is crucial for emission control - if the system fails, the vehicle may face penalties for exceeding emission standards, and the engine could enter reduced power/torque limitation mode, making it undrivable. First, I'd check the urea tank level and look for crystallized blockages, then inspect the dashboard for warning lights. In winter when freezing may prevent urea injection, it's essential to use antifreeze-type urea solution in advance. Regular maintenance is key: avoid using substandard urea, replace filters periodically to prevent system damage. When problems arise, promptly visit professional repair shops for diagnosis to prevent minor issues from escalating into major troubles.

[DeRemington]

From a technical perspective, the key reason large vehicles don't consume urea solution lies in SCR system failure. My research shows this system relies on sensor monitoring - if temperature or pressure readings are inaccurate, the system stops the pump. Nozzle clogging or pump failure prevents urea injection, resulting in no consumption. Poor-quality urea containing impurities easily blocks pipelines, worsening in winter when it freezes. This issue affects emission compliance and triggers power limitation, impacting driving. I recommend using diagnostic tools to read fault codes for problem identification, and always using qualified urea to avoid component damage from excessive concentration. Simple checks on pipeline and connector contact conditions can be done personally to prevent complete system failure through early intervention.

[VanMaggie]

I feel most anxious about driving safety when the DEF (Diesel Exhaust Fluid) is not being consumed in my heavy-duty vehicle. System failure can lead to a sharp increase in emissions, polluting the environment, and worse, it may cause engine torque limitation, making it difficult to climb hills and increasing the risk of accidents. Common causes include aging wiring harnesses disconnecting or damage to the control module. When encountering such issues, I immediately pull over and use the onboard tools to check for fault indicators instead of pushing through. For prevention, regularly top up DEF to keep the system unobstructed and maintain the electrical circuits to prevent short circuits. The key is not to overlook minor issues that could escalate into costly major repairs.