Why is the fault light not on when a China V vehicle is not using urea?
3 Answers
The reason why the fault light is not on when a China V vehicle is not using urea is due to a blocked urea nozzle. Below is relevant information about vehicle urea: 1. Measures to take when discovering that a truck is not consuming urea: If it is found that the vehicle urea has not been consumed or the vehicle's emission light is on, it may indicate that the vehicle's SCR system has stopped working (commonly referred to as not 'burning' urea). This issue cannot be resolved by DIY methods and requires immediate professional inspection and repair at a 4S shop. Possible causes include a damaged urea pump, blocked urea pipeline, or nozzle blockage. 2. Consequences of a truck not consuming urea: Failure to add urea in diesel vehicles can have extremely adverse effects on the ecological environment and is also not permitted by national laws and regulations. This is not a direct impact caused by the lack of urea but rather because the engine's electronic control system will forcibly limit the engine's torque output when it detects no urea injection and excessive exhaust pollution. Damage to the SCR injection system: If there is no urea for a long time, the nozzles, pipelines, and urea pump in the SCR system may crystallize and become blocked or be damaged by high temperatures.
I've been driving a National V diesel SUV for several years, and recently found that the urea system isn't working but the fault light isn't on, which really puzzles me. I asked my mechanic friends, and they said this situation could be due to a faulty urea level sensor not detecting an empty tank, or a control module malfunction without triggering an alarm. They suggested first manually checking the urea tank's level and testing after refilling it; if that doesn't work, it might be due to poor wiring contact or a system blockage. Don't forget regular maintenance—urea filters can easily clog the pipes if not replaced for a long time. Safety first, don't risk problems on the highway, get it diagnosed at a professional shop early, and failing emissions standards could also lead to fines. When adding urea, choose reputable brands—don't save small money to lose big.
I've driven quite a few China V emission standard vehicles, and it's quite common for the urea system not to consume urea without the warning light coming on. It could be an issue with the urea pump or injector that hasn't triggered an alarm, or a short circuit causing signal loss. First, check if the urea tank is empty yourself. Fill it up and try starting the engine. The fuse is in the circuit box; if it's blown, it can cause these symptoms. Don't neglect regular maintenance, as poor-quality or expired urea can affect the system. If you encounter this situation, deal with it promptly; don't delay, or it could lead to excessive exhaust emissions that harm the vehicle's engine. If you run into trouble on the road, pull over safely and turn on your hazard lights.
