A warning light on your Doosan equipment can be frustrating if you don’t know what is causing it. Doosan Fault Codes can assist in diagnosing the system or component that may require attention, including the engine, sensors, fuel system and emissions equipment.
There are some codes that relate to DPF concerns like soot accumulation, regeneration problems, pressure readings and ash build-up. Knowing these codes can help you take the right next step and avoid unnecessary downtime.
At 30 Minute DPF Clean, we provide professional DPF cleaning and testing services when a filter is restricted or heavily loaded. Knowing the condition of the DPF can help determine whether cleaning is the right solution.
What Are Doosan Fault Codes?
Doosan machines use an electronic control system to check the status of the engine and other key components during operation of the machine. In case there is any problem which is beyond range, it will register a fault code.
The code will be helpful since it will give you more information besides just a warning light. You can identify the system that might need to be checked rather than just knowing that something is wrong.
However, a fault code should not always be treated as confirmation that a particular part has failed. A code for a DPF for example could be related to the filter itself, but could also be a pressure sensor, sensor hose, wiring, exhaust temperature or a regeneration issue.
Codes may also be specific to the Doosan model and engine configuration. Always check the proper service information and perform proper diagnosis before replacing components.
Doosan Fault Codes Related to Engine and DPF Problems
Some fault codes are particularly useful when investigating emissions and DPF-related issues. The DPF collects soot from diesel exhaust gasses and needs to be regenerated periodically to remove the accumulated soot. Ash can also build up over time and can’t simply be burned off during normal regeneration.
If the filter is heavily loaded or the regeneration is not working properly the machine can log a fault code.
Some codes can relate to:
- Excessive soot loading
- High or abnormal DPF pressure
- DPF pressure sensor readings
- Disconnected or damaged pressure sensor hoses
- Incomplete regeneration
- Regeneration being locked or prevented
- Excessive ash accumulation
- DPF condition or damage
- Exhaust temperature monitoring
Here are some examples of DPF-related codes found in Doosan fault code information:
| Fault Code | Possible Indication | What It May Mean |
| E003719 | Maximum soot mass in particulate filter | The DPF may have accumulated a high level of soot and needs further diagnosis |
| E003609 | DPF pressure sensor range issue | The pressure sensor or its readings may need to be checked |
| E520620 | Completely damaged particulate filter | The DPF may have suffered serious damage and requires inspection |
| E520621 | DPF pressure differential issue | Pressure readings across the filter may be outside the expected range |
| E520622 | Disconnected DPF pressure sensor hose line | The hose or connection may need inspection |
| E520649 | Incomplete regeneration monitoring | The regeneration process may not be completing properly |
| E520650 | Regeneration locked | The system may have stopped regeneration because of an underlying issue |
| E520651 | Maximum ash mass in DPF | Ash accumulation may be affecting the filter’s ability to operate correctly |
These examples are intended as a starting point. The correct interpretation should always be confirmed against the documentation for the specific Doosan machine and engine.
How Doosan Fault Codes Can Point to DPF Problems
A DPF fault code can give clues to what might be going on inside the filter or related components. For example a code regarding soot loading may mean the DPF collected more soot than expected. A pressure-based code could mean that there are problems with air flow restriction, sensors or the pressure measurement system.
Regeneration is another key component as the DPF requires ideal conditions for regeneration to occur. Failure to regenerate properly on a consistent basis will result in continued accumulation of soot within the filter.
Over time this can lead to Doosan diesel particulate filter problems including higher backpressure and reduced engine performance.
The fault code should be interpreted according to the symptoms of the machine. Before recommending cleaning, repair or another solution, a technician may need to check pressure readings, sensors, hoses, exhaust temperatures and the physical condition of the DPF.
What Does a Doosan DPF Warning Light Mean?
A Doosan DPF warning light generally means the machine has detected an issue involving the particulate filter or its operation. The exact warning and response can vary depending on the model.
For example, the warning could mean that the soot loadings have increased and that regeneration needs to be done. If the machinery successfully performs the process, the warning can go away when soot levels are brought down to an acceptable point.
The warning is becoming serious when it persists and keeps coming back along with other error messages.
You may also notice:
- Reduced engine power
- More frequent regeneration
- Higher exhaust temperatures
- Poor machine performance
- Engine derating
- Additional warning lights
- Fault codes that return after being cleared
Do not ignore a persistent warning. Continuing to operate equipment with an unresolved emissions problem can result in more downtime and potentially more expensive repairs.
Common Signs of Doosan Diesel Emission Problems
Fault codes do not tell the whole story about emissions problem diagnosis. There may be more information provided by the behavior of the machine.
The most common symptoms of Doosan diesel emissions problems are as follows: regeneration cycles, power loss in the engine, and abnormal machine behavior.
You may also notice that the machine takes longer to complete regeneration or that regeneration fails altogether. A DPF that is becoming restricted can also contribute to increased exhaust backpressure.
Other possible causes should not be overlooked. Problems with the EGR system, exhaust temperature sensors, pressure sensors, fuel system or engine can also affect emissions performance.
For this reason, it is better to look at the complete picture instead of assuming that every emissions warning means the DPF itself is damaged.
Doosan DPF Troubleshooting: What Should You Check First?
In case of a DPF problem, there are some measures that will allow you to get a better idea of what is happening.
1. Record the fault code
Write the exact code that is displayed on the machine. Do not depend on the warning light alone since it may indicate several problems.
2. Note any changes in performance
Has the machine lost power? Is it regenerating more often? Has it entered a restricted operating mode? These details can help a technician identify the problem.
3. Check the pressure sensor and hoses
Pressure plays an important role in establishing the efficiency of DPF. One should take note of any existing issues in the connections and hoses of the sensors particularly when there is a problem code relating to the pressure.
4. Consider regeneration history
If regeneration efforts have been unsuccessful on previous occasions, determine what the problem is. Merely trying again to regenerate may not address the problem.
5. Check soot and ash loading
Soot and ash are not the same thing. Regeneration reduces the amount of soot, but ash still builds up in the filter. If ash levels become too high, professional cleaning may be required.
6. Do not simply keep clearing the code
Clearing a warning without identifying the cause of the problem will not fix the problem. In case the same fault occurs repeatedly, more diagnosis is required.
The proper Doosan DPF troubleshooting approach involves trying to identify the cause of the fault and not simply changing parts based on the code.
When Does a Doosan DPF Need Professional Cleaning?
Professional cleaning of the DPF may be needed if there is an excessive amount of soot and ash buildup, reduced exhaust flow or improper regeneration of the DPF.
Cleaning may be worth considering when:
- The DPF has high soot or ash loading
- Regeneration repeatedly fails
- Differential pressure remains high
- Exhaust flow is restricted
- DPF-related faults continue to return
- Testing shows that the filter itself is restricted
Professional cleaning can also help determine the condition of the filter before you spend money on a replacement. 30 Minute DPF Clean uses professional cleaning and testing to assess DPF condition and help restore proper airflow where cleaning is appropriate.
It is important to remember that cleaning is not the solution to every DPF fault. If the underlying problem is a failed sensor, damaged wiring, engine fault or another component, that issue needs to be addressed as well.
Get Your Doosan DPF Back to Proper Working Order
Doosan Fault Codes may give you a helpful tip, but finding the real source is the secret to getting your equipment back on track. A proper diagnosis can prevent unnecessary part replacement and reduce costly downtime.
If your DPF has become restricted due to excessive soot or ash, or if testing reveals the need for professional cleaning, this can be a practical alternative to replacing the filter.
30 Minute DPF Clean is a professional DPF cleaning & testing service that restores proper airflow, keeping your diesel equipment running efficiently.
Want your Doosan equipment up and running? Contact 30 Minute DPF Clean today for your professional DPF check and clean. Get in touch now and find out how we can help you tackle DPF problems before they lead to more downtime.
Frequently Asked Questions About Doosan Fault Codes
Q: What are Doosan fault codes?
The Doosan error codes are diagnostic codes generated by the equipment as a result of detecting an anomaly by the control system. They may assist in identifying the system or part that needs to be checked.
Q: Can a Doosan fault code indicate a DPF problem?
Yes. Some codes relate directly to DPF soot loading, ash accumulation, pressure readings, pressure sensors and regeneration. However, the exact cause should be confirmed through proper diagnosis.
Q: Does a Doosan DPF warning light always mean the DPF needs cleaning?
No. A warning can be caused by several issues, including regeneration problems, sensor faults or other emissions-related components. The machine should be diagnosed before deciding whether cleaning is necessary.
Q: Can I clear a Doosan DPF fault code myself?
Clearing a fault code does not fix the underlying problem. If the code returns, the cause needs to be investigated. Repeatedly clearing the warning without addressing the issue may allow the problem to become worse.
Q: Does a Doosan fault code mean the DPF needs to be replaced?
Not necessarily. Professional cleaning can help restore airflow and clean off any buildup of soot or ashes, depending on the condition of the filter. But if the filter is damaged, replacement may be needed.
