999 SPN Fault Code

Name:

Trip Gear Down Distance

Description:

Total distance accumulated while the vehicle has operated in the gear which is one gear down from top gear and exceeds a calibrated minimum time (typically the time to shift the transmission) since the last trip reset.

999 spn fault code name is Trip Gear Down Distance. If you don't take the time to look into 999 spn fault when it arises, it can add up quickly. One small issue like 999 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 999 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.

999 SPN Fault Code

Name:

Description:

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