4449 SPN Fault Code


Aftertreatment 2 Outlet NH3 Gas Sensor Heater Control


Indicates the heater status in the warm-up process. Upon receiving a power-up command, the NH3 gas sensor ramps up according to a manufacturer defined profile. The Preheat 1, Preheat 2, and Automatic messages are regions within this profile in exhaust bank 1. 00b = Automatic 01b = Preheat 2 10b = Preheat 1 11b = Heater off or Not available

4449 spn fault code name is Aftertreatment 2 Outlet NH3 Gas Sensor Heater Control. If you don't take the time to look into 4449 spn fault when it arises, it can add up quickly. One small issue like 4449 can cause a larger component to become damaged without taking the time to investigate. If you suspect your truck is suffering from one of these issues, look into replacing those small components to save money down the road.

Note: The name and description of 4449 code represents text descriptions for faults supported by another coding system and does not necessarily comply with SAE J1939. For a specific engine manufacturer's explanation for codes, please consult the engine's technical manual. See also other spn codes.

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