Can the vehicle still be driven if the urea pump return pipe is clogged?
2 Answers
It can still be driven, but it is not recommended. Here is some relevant information about the urea pump: 1. Introduction: The urea pump is the core component of the SCR system, referred to as the "urea metering pump." Its main function is to pump the urea solution from the urea tank and transport it to the nozzle through the delivery pipe. 2. Demand: With the development of the logistics and transportation industries, the number of diesel vehicles has been increasing, leading to increasingly severe vehicle exhaust pollution. With the implementation of the National V and VI emission standards, the demand for urea pumps has been growing significantly.
I've been driving diesel vehicles for over a decade, and what I fear most is urea system malfunctions. You really can't force open a clogged return line! Last time when I was hauling goods on the highway, this exact issue occurred - first I felt the vehicle losing power as if being held back, then the engine warning light came on. Diagnosis showed the urea pump pressure had surged to 6bar - continuing to drive would have definitely burned out both the injector and pump. After the SCR system shut down, the onboard computer immediately limited torque and reduced power, making it impossible to even reach 80km/h. The most troublesome part is prolonged clogging causes urea crystallization, requiring complete disassembly and cleaning of the entire aftertreatment system, with repair costs equivalent to half a year's fuel expenses. For safety, if you detect a blockage, pull over immediately and call for roadside assistance.
