What's the matter with the urea gauge not displaying?
3 Answers
This situation is most likely due to a system malfunction. Vehicle weakness, normal urea consumption: Use a diagnostic tool to read the fault code, indicating that the engine has exceeded the emission limit with no other faults. By removing the urea nozzle and performing an injection test with the diagnostic tool, no abnormalities were found. During the inspection, a large amount of urea crystals were found severely clogging the high-temperature catalytic pipe. The exhaust elbow pipe was removed for cleaning, and compressed air was used to clean the soot adhering to the ceramic surface of the catalytic converter. After replacing the urea solution, the test failure disappeared. Low urea pressure, high urea consumption: Fault symptom: The vehicle's instrument panel warning light frequently flashes. The fault code indicates low urea pressure and high urea consumption. The urea tank temperature is too high, causing urea to volatilize and be discharged from the exhaust port, crystallizing around the tank. Excessive crystallization at the exhaust port leads to blockage. Summary: During the operation of the urea system, severe vacuum suction in the urea chamber caused urea decompression blockage, resulting in a low urea pressure fault. Insufficient power, urea consumption too high or too low: The fault light remains on. Insufficient power, torque limited to 1800 rpm. The SCR system is not working properly, with urea consumption being too high or too low.
It's really annoying when the urea gauge doesn't show anything. I once encountered this situation and almost thought the urea pump was broken. Actually, the most common issue is that the sensor gets clogged with urea crystallization. You can see it after removing the urea tank, and cleaning it usually solves the problem. If you're in the north and it's frozen, urea icing can also cause abnormal gauge readings. Also, check the fuse box and look for the corresponding fuse to see if it's blown. Corrosion of wiring connectors is also quite common, especially in areas where the chassis is prone to getting wet. If you can't fix it yourself, it's better to go to a repair shop. They have diagnostic computers to directly read fault codes, which is much more reliable than guessing. By the way, the dashboard itself might be faulty, but that's less likely. Replacing the whole unit can be quite expensive.
If the urea gauge isn't lighting up, don't panic immediately. It could be that the urea level is normal but the sensor is faulty - these components work in harsh conditions inside the tank and often fail. Alternatively, there might be a CAN bus communication failure in the vehicle, preventing signal transmission to the dashboard. If only the urea display is missing while other dashboard functions work normally, the issue likely isn't with the dashboard itself. First try restarting the vehicle - sometimes electronic systems just need a reboot. If that doesn't work, check the relay near the engine compartment fuse box. If problems persist, consult a professional technician, as SCR system failures don't just affect displays but can also trigger speed limitations that compromise safe driving. Remember to regularly clean the injector nozzle and use qualified urea fluid - prevention is always better than repair.
