Code : Spn 91 Fmi 4

Spn 91 Fmi 4 problem code is about Signal Range Check Low For App1. If you don't take the time to look into Spn 91 Fmi 4 engine problem when it arises, it can add up quickly. One small issue like Spn 91 Fmi 4 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: This description 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.