9991 SPN Fault Code

Name:

Engine Cylinder 14 Instantaneous Combustion Timing, Point 1

Description:

Engine Cylinder 14 Instantaneous Combustion Timing, Point 1 is defined as the crank angle for which x% of the fuel mass has been burned by Cylinder 14 in the present engine cycle. x% is defined in SPN 9935. The data will report FB00h (64256) when the engine is not running. When the combustion happens after the TDC (Top Dead Center) of this cylinder, the timing is referred in terms of positive angle and if combustion happens before TDC, the timing is referred in terms of negative angle.

9991 spn fault code name is Engine Cylinder 14 Instantaneous Combustion Timing, Point 1. If you don't take the time to look into 9991 spn fault when it arises, it can add up quickly. One small issue like 9991 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 9991 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.

9991 SPN Fault Code

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