What is the NCD light in China VI vehicles?
4 Answers
The illumination of the NCD indicator light in China VI vehicles means that the urea solution level is below 10%, and urea needs to be added as soon as possible. Below are the specific details about automotive urea: 1. Principle: The main harmful substances in exhaust are nitrogen oxides and particulates. Technical means can reduce particulate emissions inside the engine, leaving mainly nitrogen oxides in the exhaust. Urea is injected into the exhaust after-treatment device, where it decomposes into ammonia at high temperatures. Under the action of a catalyst, the ammonia reacts with nitrogen oxides to produce harmless nitrogen and water. This device is called the SCR after-treatment system. 2. Urea consumption: Vehicles have a dedicated urea tank, and urea is consumed as long as the vehicle is running, so it must be replenished promptly. Generally, about 4 liters of urea are consumed per 100 liters of diesel. The exact amount depends on factors such as engine displacement, model, manufacturer, etc. Different road conditions and loads can also affect urea consumption.
Having driven a China VI vehicle for several years, I'm quite familiar with the NCD light. It's essentially the malfunction indicator lamp on the dashboard. The China VI emission standards are extremely strict, and when this light comes on, it means the system has detected an issue—such as a faulty sensor, excessive emissions, or component failure. Common causes include oxygen sensor failure, aging catalytic converter, or fuel system leaks. When the light stays steadily lit, you can still drive at low speed to a repair shop. But if it starts flashing, you must stop immediately to prevent engine damage. I recommend regular maintenance and exhaust system inspections to reduce the risk of the light coming on. Don't ignore this small light—it's directly related to vehicle performance and environmental compliance. Prompt diagnosis can prevent bigger troubles and helps protect the environment.
As a young car owner, I've encountered the NCD light suddenly turning on while driving a China VI vehicle. It's just a warning signal indicating an emission issue. It might stem from a sensor false alarm or a minor problem, but ignoring it could lead to increased fuel consumption and potential driving impacts. I usually start by using a mobile OBD scanner to read the trouble codes and diagnose the cause. Simple fixes like clearing the fault codes or using fuel system cleaners might solve it. You can still drive to a repair shop with the light on, but if it starts flashing, I immediately pull over and call for a tow truck. Developing good habits like regular checks and avoiding low-quality fuel can help prevent such hassles.
The NCD light is an indicator for emission faults in China VI vehicles, illuminating when the system detects abnormalities such as oxygen sensor failure or excessive emissions. Due to the stringent China VI standards, common causes for the light include component aging, circuit issues, or poor fuel quality. Prompt attention can prevent increased pollution and performance degradation, with reading diagnostic codes recommended for repairs.
