Mack Aftertreatment Fault Codes

Mack fault code P046C64 generally points to an EGR differential pressure sensor range or performance problem.

Mack fault code P20D0 is commonly associated with the aftertreatment fuel dosing or hydrocarbon dosing system used to raise exhaust temperature during DPF regeneration.

Mack fault code P20D000 usually indicates a general aftertreatment fuel dosing control fault.

Mack fault code P20DC00 is commonly related to aftertreatment fuel supply, dosing control, or dosing-circuit performance.

Mack fault code P21CA00 is generally tied to reductant/DEF or aftertreatment control performance depending on the specific Mack/Volvo engine calibration.

Mack fault code P24F813 is typically an aftertreatment-related rationality or calibration-style fault.

Mack fault code P269900 commonly relates to aftertreatment fuel dosing or hydrocarbon dosing performance.

Mack fault code P269A00 is generally associated with aftertreatment fuel dosing control or performance.

Mack fault code SPN437514 generally points to a DEF/SCR dosing or reductant system condition that requires special diagnostic action.

Mack fault code SPN52460 is commonly an aftertreatment inducement or emissions-system derate status code.

Mack fault code U010E00 usually indicates lost communication with the reductant control module or DEF control system.

Mack fault code U116F00 is a manufacturer-specific communication or network-related aftertreatment fault.