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What to Do When Automotive Urea Freezes?

1 Answers

MacJasmine

07/30/25 7:59am

Automotive urea freezing can be addressed by: adding a vehicle urea modifier to lower the freezing point of the urea solution, or using an external heating device to thaw it. Northern version vehicles equipped with SCR systems come with a built-in urea tank thawing and heating function. When the engine coolant temperature reaches 60 degrees Celsius and the urea solution temperature is below minus 5 degrees Celsius, the system will not inject urea solution in low-temperature conditions, thereby providing sufficient time to thaw the crystallized urea solution. Automotive urea is used in the selective catalytic reduction (SCR) system of diesel vehicles to catalytically reduce nitrogen oxides in the exhaust into harmless nitrogen and water, thereby reducing nitrogen oxide emissions from diesel engines, offering energy-saving and environmental benefits.

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