How to confirm that the urea pump is broken
The urea pump is a key component in the SCR (selective catalytic reduction) system of diesel vehicles. It is responsible for injecting urea solution (AdBlue) into the exhaust pipe to reduce nitrogen oxide emissions. If the urea pump fails, the vehicle may report a fault code, lose power, or even have a limited speed. This article will combine recent hot topics and structured data to introduce in detail how to confirm whether the urea pump is damaged.
1. Common symptoms of urea pump failure
| Symptoms | Possible reasons |
|---|---|
| Engine malfunction light comes on | Urea pump circuit or mechanical failure |
| Power reduction or speed limit | SCR system stops working |
| Abnormal urea consumption | Pump body leaks or injection volume is inaccurate |
| White smoke coming from the exhaust pipe | Urea is not completely decomposed |
| The system reports a fault code (such as P204F, P208E) | Pump or sensor failure |
2. Steps to diagnose urea pump failure
1.Read fault code: Use OBD diagnostic instrument to read SCR system fault codes. Common urea pump related fault codes include:
| DTC | meaning |
|---|---|
| P204F | Urea pump pressure is too low |
| P208E | Abnormal performance of urea pump |
| P207F | Urea pump motor circuit failure |
2.Check urea solution: Make sure the liquid level in the urea tank is normal and there is no crystallization or contamination in the solution.
3.Test urea pump pressure: Use special tools to measure the output pressure of the pump (normal value is usually 5-9Bar).
4.Listen to the working sound of the pump body: After starting the vehicle, the urea pump should make a slight buzzing sound. If there is no sound, the motor may be damaged.
3. Recent popular urea pump failure cases (last 10 days)
| car model | Fault phenomenon | solution |
|---|---|---|
| Jiefang J6 | P204F fault code reported, insufficient power | Replace urea pump assembly |
| Sinotruk Howo | Urea pump not working, no sound | Repair motor circuit |
| Dongfeng Tianlong | Urea consumption too fast | Replace leaking seals |
4. Urea pump maintenance suggestions
1.Troubleshoot simple issues first: Check fuses, line connections and urea quality.
2.Professional equipment testing: It is recommended to use the manufacturer's special diagnostic instrument (such as Jiefang's "Jiefangxing" APP).
3.Repair cost reference:
| Maintenance items | Price range (yuan) |
|---|---|
| Urea pump assembly replacement | 1500-4000 |
| Seal replacement | 200-500 |
| Motor repair | 800-1500 |
5. Measures to prevent urea pump failure
1. Use automotive urea solution that meets the GB29518 standard
2. Pay attention to the insulation of the urea tank in winter to prevent crystallization
3. Clean the urea nozzle regularly (recommended every 50,000 kilometers)
4. Avoid long-term low-speed operation to prevent carbon accumulation in the urea system
Summary: Confirming a urea pump failure requires comprehensive judgment based on fault codes, pressure tests and actual performance. Recent data shows that urea pump motor failures and sealing problems account for 67%. It is recommended that car owners perform timely maintenance when encountering relevant symptoms to avoid engine torque limitation due to SCR system failure.
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