This diagnostic trouble code is triggered when the DEF dosing system cannot be powered down properly. Proper power down is crucial for maintaining the integrity of the DEF system and preventing issues during subsequent startups.

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This diagnostic code indicates that the resistance in the DEF dosing unit reversing valve circuit is too low, typically pointing to a short to ground. This condition can prevent the reversing valve from functioning properly, affecting the DEF dosing process.

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This diagnostic code is set when the ECU detects that the resistance in the DEF dosing unit reversing valve circuit is too high, typically indicating an open circuit. This can prevent the reversing valve from functioning properly, affecting the DEF dosing process.

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This code is triggered when the DEF tank heater coolant control valve is detected to be stuck closed, causing the thawing of the DEF tank to take too long. This can affect the proper heating and operation of the DEF system, potentially leading to DEF freezing and reduced system efficiency.

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This diagnostic trouble code indicates that the DEF tank heater coolant control valve is stuck open, leading to a DEF tank temperature that is higher than expected. This can affect the proper heating and operation of the DEF system, potentially causing performance issues.

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This code is triggered when the resistance in the DEF tank heater coolant valve circuit is too low, typically indicating a short circuit to ground. This can cause the coolant valve to malfunction or fail, affecting the heating of the DEF tank.

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This diagnostic code indicates that the resistance in the Diesel Exhaust Fluid (DEF) tank heater coolant valve circuit is too high, typically indicating an open circuit. This can prevent the coolant valve from functioning properly, affecting the heating of the DEF tank.

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This diagnostic trouble code is triggered when the NOx value at the outlet of the Selective Catalytic Reduction (SCR) system is detected to be too high to start regeneration, indicating moderately low efficiency of the catalytic converter. This can hinder the SCR system’s ability to reduce NOx emissions effectively.

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This diagnostic trouble code is set when the NOx value at the outlet of the SCR system is detected to be too high to start regeneration, indicating slightly low efficiency of the catalytic converter. This condition can affect the overall performance of the SCR system and its ability to reduce NOx emissions effectively.

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This fault code is triggered when the ECU detects that the NOx value at the outlet of the Selective Catalytic Reduction (SCR) system is too high, indicating extremely low efficiency of the catalytic converter. This condition can result in non-compliance with emissions regulations and may be caused by low-quality Diesel Exhaust Fluid (DEF).

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This diagnostic code indicates that the SCR temperature module has detected a problem with measuring the outlet temperature. Accurate measurement of the SCR outlet temperature is crucial for assessing the efficiency and performance of the SCR system, which reduces nitrogen oxide (NOx) emissions.

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