Description:

This fault code is triggered when the ECU detects that the temperature differential between the Diesel Oxidation Catalyst (DOC) outlet and the Diesel Particulate Filter (DPF) outlet indicates the presence of unintended combustibles within the DPF multiple times. This can be a serious issue, indicating potential safety and performance risks.

Reaction:

The ECU may take protective actions, such as limiting engine performance or initiating warnings, to address the presence of unintended combustibles and prevent potential damage or safety hazards.

Recommendations:

• Inspect DPF and DOC: Thoroughly inspect the DPF and DOC for any signs of damage or malfunction that could lead to the presence of unintended combustibles.
• Verify Fuel and Combustion Quality: Ensure that the fuel quality is good and that the combustion process is efficient to minimize the risk of unintended combustibles.
• Check for Leaks or Contaminants: Look for any exhaust system leaks or contaminants that could contribute to unintended combustibles in the DPF.
• Perform Manual Regeneration: Conduct a manual regeneration to try and clear the DPF of unintended combustibles.
• Reset ECU and Monitor: After resolving the issue, reset the ECU to clear the fault code and closely monitor the system to ensure the problem does not recur.

Note:

Unintended combustibles in the DPF can pose significant risks, including potential fire hazards. Addressing this issue promptly and thoroughly is crucial for maintaining vehicle safety and performance.