CAT Engine Fault Codes List: SPN 655 FMI 2 to SPNM 111 FMI 18
Page 12 of 12 of the full CAT Engine fault code list (1,341 codes). Each entry is the code as the machine reports it and what the manufacturer data says it means.
CAT Engine codes SPN 655 FMI 2 to SPNM 111 FMI 18
- SPN 655 FMI 2Engine Injector Cylinder #05 : Erratic, Intermittent or Incorrect (C6.6 Engine Only)
- SPN 655 FMI 5Engine Injector Cylinder #05 : Current Below Normal (C6.6 Engine Only)
- SPN 655 FMI 6Engine Injector Cylinder #05 : Current Above Normal (C6.6 Engine Only)
- SPN 656 FMI 2Engine Injector Cylinder #06 : Erratic, Intermittent or Incorrect (C6.6 Engine Only)
- SPN 656 FMI 5Engine Injector Cylinder #06 : Current Below Normal (C6.6 Engine Only)
- SPN 656 FMI 6Engine Injector Cylinder #06 : Current Above Normal (C6.6 Engine Only)
- SPN 676 FMI 19Engine Glow Plug Relay : Data Error
- SPN 676 FMI 5Engine Glow Plug Relay : Current Below Normal
- SPN 676 FMI 6Engine Glow Plug Relay : Current Above Normal
- SPN 677 FMI 3Engine Starter Motor Relay : Voltage Above Normal
- SPN 677 FMI 5Engine Starter Motor Relay : Current Below Normal
- SPN 677 FMI 6Engine Starter Motor Relay : Current Above Normal
- SPN 678 FMI 3ECU 8 Volts DC Supply : Voltage Above Normal
- SPN 678 FMI 4ECU 8 Volts DC Supply : Voltage Below Normal
- SPN 723 FMI 8Engine Speed Sensor #2 : Abnormal Frequency, Pulse Width, or Period
- SPN 91 FMI 2Accelerator Pedal Position 1 : Erratic, Intermittent, or Incorrect (Engines Equipped with a Throttle Switch)
- SPN 91 FMI 3Accelerator Pedal Position 1 : Voltage Above Normal (Engines Equipped with an Analog Throttle)
- SPN 91 FMI 4Accelerator Pedal Position 1 : Voltage Below Normal (Engines Equipped with an Analog Throttle)
- SPN 91 FMI 8Accelerator Pedal Position #1 : Abnormal Frequency, Pulse Width, or Period
- SPN 94 FMI 15High Fuel Pressure
- SPN 94 FMI 16High Unfiltered Fuel Pressure
- SPN 94 FMI 17Low Fuel Pressure
- SPN 95Fuel Filter Restriction - most severe
- SPN 95 FMI 1Fuel Filter Restriction
- SPN 95 FMI 15Fuel Filter Restriction - least severe
- SPN 95 FMI 16Fuel Filter Restriction - moderate severity
- SPN 95 FMI 17Fuel Filter Restriction
- SPN 95 FMI 18Fuel Filter Restriction
- SPN 970 FMI 31Engine Auxiliary Engine Shutdown Switch
- SPN 976 FMI 2PTO Governor State : Erratic, Intermittent, or Incorrect
- SPN 97 FMI 15Water in Fuel Indicator : High - least severe (1)
- SPN 97 FMI 16Water In Fuel Indicator : High - Moderate Severity (2)
- SPN 97 FMI 3Water In Fuel Indicator : Voltage Above Normal
- SPN 97 FMI 4Water In Fuel Indicator : Voltage Below Normal
- SPN 98 FMI 1Engine Oil Level : Low - most severe (3)
- SPN 98 FMI 18Engine Oil Level : Low - moderate severity (2)
- SPN 99High Oil Filter Differential Pressure - most severe
- SPN 99 FMI 15High Oil Filter Differential Pressure - lease severe
- SPN 99 FMI 16High Oil Filter Differential Pressure - moderate severity
- SPN FMI 16High Exhaust Differential Temperature - moderate severity
- SPNM 111 FMI 18Low Engine Coolant Level
Other Caterpillar machine types
Fault code lists by brand
- Volvo6,508 codes
- New Holland Tractor3,475 codes
- FPT3,033 codes
- Case IH2,992 codes
- Bobcat2,653 codes
- Challenger Tractor2,434 codes
- New Holland Combine2,274 codes
- John Deere Tractors1,884 codes
- Case Wheel Loader1,859 codes
- John Deere Engines1,853 codes
- Cummins1,847 codes
- Challenger Rubber Track Tractor1,747 codes
- Volvo Wheel Loader1,726 codes
- Deutz1,684 codes
Safety-critical: confirm before use
Safety first: park on level ground, stop the engine, and secure the machine before any inspection. Thresholds, component locations, wire numbers, fuse locations, and reset procedures can vary by model, configuration, and serial number. Confirm them in the service documentation for your exact machine.