Diagnostic Overview
MaxxForce fault code SPN 4360 generally belongs to the SCR/aftertreatment temperature or catalyst monitoring group. The ECM may be monitoring exhaust temperature, catalyst conditions, or SCR performance and finding data outside the expected range. Without the FMI, this entry should be treated as a broad aftertreatment signal or performance family rather than a single confirmed failure.
Likely Causes
Faulty aftertreatment temperature sensor, wiring fault, exhaust leak, DEF dosing issue, SCR catalyst temperature problem, sensor rationality issue, or abnormal exhaust conditions during regeneration.
What To Check First
Retrieve the complete SPN/FMI, compare aftertreatment temperature sensor data cold and hot, inspect harnesses and connectors, check for exhaust leaks, and review related SCR or DEF dosing codes.