This diagnostic trouble code is set when the DEF dosing unit pressure is detected to be moderately high. Elevated pressure levels can indicate a potential blockage or malfunction within the DEF system that may affect proper DEF dosing.

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This diagnostic code indicates that the DEF dosing unit has failed to relieve system pressure during a shut-off sequence or a new suction sequence. This condition can cause improper DEF dosing and affect the performance of the aftertreatment system.

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This code is triggered when the DEF dosing unit signal is out of range low, indicating a short to ground. Such a condition can prevent the DEF dosing unit from functioning correctly, impacting DEF injection and overall aftertreatment system performance.

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This diagnostic trouble code indicates that the DEF dosing unit signal is out of range high, which typically points to a short to 12 volts. This condition can cause the DEF dosing unit to malfunction or operate incorrectly, leading to potential issues with DEF injection and aftertreatment system performance.

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This diagnostic trouble code is set when the pressure in the Diesel Exhaust Fluid (DEF) dosing unit is detected to be extremely low. Low pressure can prevent the correct amount of DEF from being injected, reducing the effectiveness of the emission control system.

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This fault code is triggered when the pressure in the Diesel Exhaust Fluid (DEF) dosing unit is detected to be extremely high. Excessively high pressure can damage the dosing unit and impair the proper injection of DEF into the aftertreatment system.

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This diagnostic code is set when the ECU detects that the level of unintended combustibles in the Diesel Particulate Filter (DPF) is moderately higher than expected. This situation indicates that some combustibles are not being fully oxidized, which can affect the efficiency of the aftertreatment system and potentially pose safety risks.

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This diagnostic code indicates that the calculated level of unintended combustibles in the Diesel Particulate Filter (DPF) is slightly higher than expected. This condition suggests that some combustibles are not being fully oxidized during the normal operation or regeneration process.

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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.

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This diagnostic code indicates that the calculated ash level in the Diesel Particulate Filter (DPF) is moderately higher than expected. Elevated ash levels can reduce the efficiency of the DPF and may necessitate more frequent maintenance.

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This diagnostic code indicates that the calculated ash level in the Diesel Particulate Filter (DPF) is slightly higher than expected. Ash accumulation is a normal byproduct of DPF operation, but elevated levels suggest the need for maintenance to ensure continued effectiveness.

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