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What does it mean when the SCR light comes on in a diesel vehicle?

1 Answers

JulietteLee

07/29/25 10:58am

When the SCR light comes on in a diesel vehicle, it mainly indicates a fault in the Selective Catalytic Reduction (SCR) system, and it is necessary to take the vehicle to a repair shop for inspection and repair by professional technicians. Additionally, the SCR light may also come on due to reasons such as a damaged controller, loose sensor connectors, short circuits, or related wiring harness faults. An illuminated SCR light can directly affect the vehicle's engine displacement, and if not properly addressed, it may lead to the burning out of the urea pump. How to handle the SCR light: If the SCR light comes on in a diesel engine, it is essential to visit a repair shop and have professional technicians inspect and repair the issue. Since there are many potential causes for the SCR light to come on, only a professional can conduct a thorough inspection to identify the root cause and effectively resolve the problem. Maintenance after the light is resolved: Maintain the urea pump. Since residual liquid remains in the urea pump and pipelines after the vehicle stops working, it is necessary to perform a cleaning process after shutting off the engine to prevent crystallization or freezing. All urea pumps have filters or filter elements, and technical standards require regular cleaning or replacement. Otherwise, prolonged neglect may lead to blockages or damage, resulting in a loss of filtration effectiveness and ultimately causing system malfunctions.

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