Why doesn't the urea pump make noise after parking?

1 Answers
SanAubree
07/30/25 12:37am
If the urea pump makes noise after parking, it indicates that the vehicle is retracting urea. If there is no noise after parking, it means the urea pump has malfunctioned. Here are the solutions for high urea pressure issues: 1. High urea pressure. Reporting high urea pressure usually indicates a blocked return check valve, which needs to be replaced with a new one. 2. Urea pump not absorbing liquid. The main reason for the urea pump not absorbing liquid is insufficient spring tension caused by high-pressure impact on the electromagnetic directional valve. Simply disassemble the directional valve, replace the spring, and clean the check valve diaphragm under the motor.
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