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What Causes Frequent DPF Regeneration?

2 Answers

VonSilas

07/24/25 5:05am

DPF regeneration occurs frequently due to prolonged low-speed driving. Here are the precautions for DPF usage: 1. Fuel requirements for the DPF post-processor: Low-sulfur diesel that meets the National V emission regulations (sulfur content less than 10ppm) must be used to prevent poisoning and clogging of the post-processor; at the same time, to extend the mileage between ash cleaning, it is recommended to use CJ-4 grade or higher engine oil. The ash content in the lubricating oil has a significant impact on the DPF. If the ash content is high, it can easily cause DPF clogging. 2. Conditions for DPF regeneration: Regeneration is triggered by carbon loading, which is calculated by the ECU's internal data model. Regeneration is based on this value. When the carbon load is greater than 18g but less than 30g, active regeneration is used, during which the engine operates normally, the exhaust system outlet temperature is higher than the normal range, and the high exhaust temperature light remains on. When the carbon load is greater than 30g but less than 40g, driver-initiated regeneration is used, meaning manual regeneration by the driver.

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DeReed

08/11/25 12:40am

I've been driving a diesel SUV for several years and noticed the DPF regeneration keeps triggering, mainly because my city driving consists of short commutes. For example, my commute to work is only about ten kilometers, and the engine doesn't have enough time to warm up to 500-600 degrees Celsius, so the soot in the DPF doesn't burn off completely, and the system keeps attempting forced regeneration. This not only consumes more fuel but also makes a lot of noise. Another common issue is frequent braking and acceleration in heavy traffic, which causes unstable engine load and produces extra soot particles. I've tried driving steadily on the highway for a few dozen kilometers each month to stabilize the exhaust temperature, which reduced the regeneration frequency. For a long-term solution, I recommend reviewing driving habits and avoiding frequent short trips.

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