4221 SPN Fault Code

Name:

Transmission Directional Shift at High Speed

Description:

Indicates that transmission has executed a direction shift whereby the transmission output shaft speed was above a pre-determined level at the initiation of the shift.Note: This SPN will facilitate unique identification of the occurance of this condition in troubleshooting scenarios. The presence of this SPN in a list of previously active DTCs could be used to deduce that a transmission has been operated in an abusive manner while in service.

4221 spn fault code name is Transmission Directional Shift at High Speed. If you don't take the time to look into 4221 spn fault when it arises, it can add up quickly. One small issue like 4221 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 4221 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.

4221 SPN Fault Code

Name:

Description:

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