Description:

This diagnostic trouble code indicates that the Diesel Oxidation Catalyst (DOC) outlet temperature is detected to be moderately low. Moderately low outlet temperatures can suggest potential issues within the exhaust system or engine operation that need attention.

Reaction:

The ECU may adjust engine performance or operational parameters to manage the moderately low DOC outlet temperature, aiming to maintain optimal exhaust system function and emissions control.

Recommendations:

• Inspect Fuel System: Check for issues in the fuel injection system that might cause lower exhaust temperatures, such as insufficient fuel injection or improper combustion.
• Verify Combustion Efficiency: Ensure that the engine combustion process is operating efficiently. Address any issues related to incorrect air-fuel ratios or malfunctioning injectors.
• Inspect Exhaust System: Look for any issues in the exhaust system that could contribute to lower temperatures, such as leaks or blockages.
• Check DOC Condition: Inspect the DOC for any signs of inefficiency or blockages that might cause lower outlet temperatures.
• Monitor Operating Conditions: Review the operating conditions and driving patterns that might contribute to moderately lower DOC outlet temperatures.
• Reset ECU and Monitor System: After addressing the issue, reset the ECU to clear the fault code and monitor the system to ensure temperatures return to normal ranges.

Note:

Maintaining appropriate DOC outlet temperatures is crucial for the efficiency and longevity of the exhaust aftertreatment system. Regular maintenance and timely inspections can help prevent temperature-related issues.