4402 SPN Fault Code

Name:

Aftertreatment 2 SCR System Requested State

Description:

Requested state of SCR system for aftertreatment system 2 (exhaust bank 2). 0000b = Dormant (sleep mode) 0001b = Preparing dosing readiness (wake up; prepare to operate; wait for start) 0010b = Normal dosing operation 0011b = System error pending 0100b = Reserved for future assignment by SAE 0101b = Protect mode against heat (pressure buildup) 0110b = Protect mode against cold (defreeze) 0111b = Shutoff (wait for after-run) 1000b = Diagnosis (after-run) 1001b = Service test mode, dosing allowed 1010b = Service test mode, dosing not allowed 1011b to 1101b = Reserved for future assignment by SAE 1110b = Error 1111b = Not available

4402 spn fault code name is Aftertreatment 2 SCR System Requested State. If you don't take the time to look into 4402 spn fault when it arises, it can add up quickly. One small issue like 4402 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 4402 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.

4402 SPN Fault Code

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