Diagnostic Overview
Mack fault code P24F813 is typically an aftertreatment-related rationality or calibration-style fault. Depending on engine year and calibration, it may involve an aftertreatment sensor, particulate matter monitoring, or regeneration-related control. Because the suffix 13 often indicates calibration or out-of-range rationality, the truck should be diagnosed with live data rather than by code number alone.
Likely Causes
Aftertreatment sensor rationality issue; failed sensor; wiring fault; incorrect calibration; exhaust leak; regeneration performance problem.
What To Check First
Use Tech Tool to confirm the exact component, inspect related sensors and wiring, and review exhaust temperature, DPF pressure, and regeneration history.