All Caterpillar Fault Codes
168 Caterpillar diesel fault codes. Click any code for causes, diagnostics, severity, and common fixes.
CAT-CID100-FMI3 critical
Engine Oil Pressure Sensor - Voltage Above Normal (Open/Short to High)
CAT-CID100-FMI4 critical
Engine Oil Pressure Sensor - Voltage Below Normal (Short to Low)
CAT-SKIDSTEER-100-1 critical
Engine Oil Pressure Below Safe Operating Threshold
CAT-SKIDSTEER-110-0 critical
Engine Coolant Temperature High Shutdown
CAT-SKIDSTEER-190-0 critical
Engine Overspeed Shutdown, ECM Cut Fuel
CAT-SKIDSTEER-5246-15 critical
Aftertreatment Inducement Severe Derate Active
CAT-SPN100-FMI1 critical
Engine Oil Pressure Low
CAT-SPN110-FMI0 critical
Engine Coolant Temperature Above Normal
CAT-SPN111-FMI1 critical
Coolant Level Low
CAT-TH-100-1 critical
Engine Oil Pressure Below Safe Operating Threshold
CAT-TH-110-0 critical
Engine Coolant Temperature High Shutdown Fault
CAT-TH-190-0 critical
Engine Overspeed Shutdown: RPM Exceeded Safe Limit
CAT-TH-5246-15 critical
EPA Aftertreatment Inducement Derate Active
CAT-CID100-FMI1 serious
Engine Oil Pressure Sensor - Data Valid But Below Normal Operating Range
CAT-CID1079-FMI7 serious
EGR Valve Actuator - Mechanical System Not Responding
CAT-CID164-FMI0 serious
Injection Actuation Pressure Above Normal
CAT-CID164-FMI1 serious
Injection Actuation Pressure Below Normal
CAT-CID164-FMI3 serious
Injection Actuation Pressure Sensor - Voltage High
CAT-CID164-FMI4 serious
Injection Actuation Pressure Sensor - Voltage Low
CAT-CID165-FMI3 serious
Injection Actuation Pressure Regulator (IAPR) - Open/High
CAT-CID165-FMI4 serious
Injection Actuation Pressure Regulator (IAPR) - Short
CAT-CID165-FMI6 serious
IAPR Current Above Normal
CAT-CID1796-FMI7 serious
Fuel Pressure Regulator - Mechanical
CAT-CID1797-FMI0 serious
Fuel Rail Pressure Above Normal
CAT-CID1797-FMI1 serious
Fuel Rail Pressure Below Normal
CAT-CID1797-FMI3 serious
Fuel Rail Pressure Sensor - Voltage High
CAT-CID1797-FMI4 serious
Fuel Rail Pressure Sensor - Voltage Low
CAT-CID1835-FMI0 serious
DPF Soot Load Above Normal
CAT-CID190-FMI0 serious
Engine Speed / Crankshaft Sensor - Data Valid But Above Normal Operating Range
CAT-CID190-FMI2 serious
Engine Speed / Crankshaft Sensor - Data Erratic, Intermittent, or Incorrect
CAT-CID190-FMI3 serious
Engine Speed / Crankshaft Sensor - Voltage Above Normal (Open/Short to High)
CAT-CID190-FMI8 serious
Engine Speed / Crankshaft Sensor - Abnormal Frequency, Pulse Width, or Period
CAT-CID2239-FMI7 serious
Aftertreatment Injector Mechanical Fault
CAT-CID2452-FMI7 serious
VGT Turbocharger Actuator Mechanical Fault
CAT-CID247-FMI9 serious
J1939 Data Link - Abnormal Update Rate (Data Link)
CAT-CID262-FMI3 serious
5V DC Sensor Supply #1 - Voltage Above Normal (Open/Short to High)
CAT-CID262-FMI4 serious
5V DC Sensor Supply #1 - Voltage Below Normal (Short to Low)
CAT-CID269-FMI3 serious
5V DC Sensor Supply #2 - Voltage Above Normal (Open/Short to High)
CAT-CID269-FMI4 serious
5V DC Sensor Supply #2 - Voltage Below Normal (Short to Low)
CAT-CID274-FMI3 serious
8V DC Sensor Supply - Voltage Above Normal (Open/Short to High)
CAT-CID274-FMI4 serious
8V DC Sensor Supply - Voltage Below Normal (Short to Low)
CAT-CID274-FMI7 serious
VGT Actuator - Mechanical System Not Responding
CAT-CID2791-FMI7 serious
EGR System Performance
CAT-CID342-FMI2 serious
Camshaft Position Sensor (Secondary) - Data Erratic, Intermittent, or Incorrect
CAT-CID342-FMI8 serious
Camshaft Position Sensor (Secondary) - Abnormal Frequency, Pulse Width, or Period
CAT-CID620-FMI3 serious
5V Sensor Supply (Aftertreatment) - Voltage Above Normal (Open/Short to High)
CAT-CID620-FMI4 serious
5V Sensor Supply (Aftertreatment) - Voltage Below Normal (Short to Low)
CAT-CID91-FMI3 serious
Throttle Position Sensor - Voltage Above Normal (Open/Short to High)
CAT-CID91-FMI4 serious
Throttle Position Sensor - Voltage Below Normal (Short to Low)
CAT-CID91-FMI8 serious
Throttle Position Sensor - Abnormal Frequency, Pulse Width, or Period
CAT-INJ1-FMI12 serious
Cylinder 1 Injector - Bad Intelligent Device or Component
CAT-INJ1-FMI5 serious
Cylinder 1 Injector - Current Below Normal / Open Circuit
CAT-INJ1-FMI6 serious
Cylinder 1 Injector - Current Above Normal / Short to Ground
CAT-INJ2-FMI12 serious
Cylinder 2 Injector - Bad Intelligent Device or Component
CAT-INJ2-FMI5 serious
Cylinder 2 Injector - Current Below Normal / Open Circuit
CAT-INJ2-FMI6 serious
Cylinder 2 Injector - Current Above Normal / Short to Ground
CAT-INJ3-FMI12 serious
Cylinder 3 Injector - Bad Intelligent Device or Component
CAT-INJ3-FMI5 serious
Cylinder 3 Injector - Current Below Normal / Open Circuit
CAT-INJ3-FMI6 serious
Cylinder 3 Injector - Current Above Normal / Short to Ground
CAT-INJ4-FMI12 serious
Cylinder 4 Injector - Bad Intelligent Device or Component
CAT-INJ4-FMI5 serious
Cylinder 4 Injector - Current Below Normal / Open Circuit
CAT-INJ4-FMI6 serious
Cylinder 4 Injector - Current Above Normal / Short to Ground
CAT-INJ5-FMI12 serious
Cylinder 5 Injector - Bad Intelligent Device or Component
CAT-INJ5-FMI5 serious
Cylinder 5 Injector - Current Below Normal / Open Circuit
CAT-INJ5-FMI6 serious
Cylinder 5 Injector - Current Above Normal / Short to Ground
CAT-INJ6-FMI12 serious
Cylinder 6 Injector - Bad Intelligent Device or Component
CAT-INJ6-FMI5 serious
Cylinder 6 Injector - Current Below Normal / Open Circuit
CAT-INJ6-FMI6 serious
Cylinder 6 Injector - Current Above Normal / Short to Ground
CAT-SKIDSTEER-100-3 serious
Oil Pressure Sensor Voltage High Fault
CAT-SKIDSTEER-110-15 serious
Engine Coolant Temperature High Warning
CAT-SKIDSTEER-190-8 serious
Engine Speed Sensor Signal Erratic or Lost
CAT-SKIDSTEER-3251-15 serious
DPF Differential Pressure Too High Warning
CAT-SKIDSTEER-639-14 serious
J1939 CAN Bus Off Fault Detected
CAT-SKIDSTEER-HYDRAULIC-OIL-LEVEL-LOW serious
Hydraulic Reservoir Level Switch Reports Low Fluid
CAT-SKIDSTEER-HYDRAULIC-OIL-TEMP-HIGH serious
Hydraulic Oil Temperature Above Safe Limit
CAT-SKIDSTEER-PARK-BRAKE-FAULT serious
Park Brake Pressure Switch Fault, Drive Inhibited
CAT-SPN102-FMI0 serious
Boost Pressure Above Normal
CAT-SPN102-FMI1 serious
Boost Pressure Below Normal
CAT-SPN157-FMI0 serious
Rail Pressure Above Normal
CAT-SPN157-FMI1 serious
Rail Pressure Below Normal
CAT-SPN3251-FMI0 serious
DPF Differential Pressure Above Normal
CAT-SPN3464-FMI7 serious
VGT Actuator Mechanical (J1939)
CAT-SPN3509-FMI3 serious
5V Sensor Supply - High
CAT-SPN3509-FMI4 serious
5V Sensor Supply - Low
CAT-SPN412-FMI0 serious
EGR Temperature Above Normal
CAT-SPN51-FMI3 serious
Throttle Position - Voltage High
CAT-SPN51-FMI4 serious
Throttle Position - Voltage Low
CAT-SPN639-FMI9 serious
J1939 Network Communications Abnormal
CAT-TH-100-3 serious
Oil Pressure Sensor Signal Voltage Too High
CAT-TH-190-8 serious
Engine Speed Sensor Signal Erratic or Abnormal
CAT-TH-3251-15 serious
DPF Differential Pressure High, Regen Required
CAT-TH-4364-17 serious
SCR NOx Conversion Efficiency Below Threshold
CAT-TH-639-14 serious
J1939 CAN Bus Off Fault Detected
CAT-TH-BOOM-ANGLE-OUT-OF-RANGE serious
Boom Angle Sensor Signal Out of Range
CAT-TH-BOOM-EXTENSION-FAULT serious
Boom Extension Sensor Signal Abnormal
CAT-TH-FRAME-LEVEL-FAULT serious
Frame Tilt Sensor Out of Range, Auto-Level Disabled
CAT-TH-HYDRAULIC-OIL-TEMP-HIGH serious
Hydraulic Oil Temperature Above Safe Operating Limit
CAT-TH-LOAD-MOMENT-EXCEEDED serious
Load Moment Limit Exceeded, Boom Functions Cut Out
CAT-CID102-FMI3 moderate
Boost Pressure Sensor - Voltage Above Normal (Open/Short to High)
CAT-CID102-FMI4 moderate
Boost Pressure Sensor - Voltage Below Normal (Short to Low)
CAT-CID105-FMI3 moderate
Intake Manifold Air Temperature - Voltage Above Normal (Open/Short to High)
CAT-CID105-FMI4 moderate
Intake Manifold Air Temperature - Voltage Below Normal (Short to Low)
CAT-CID1079-FMI13 moderate
EGR Valve Actuator - Calibration Required
CAT-CID1079-FMI3 moderate
EGR Valve Position Sensor - Voltage High
CAT-CID1079-FMI4 moderate
EGR Valve Position Sensor - Voltage Low
CAT-CID110-FMI3 moderate
Engine Coolant Temperature - Voltage Above Normal (Open/Short to High)
CAT-CID110-FMI4 moderate
Engine Coolant Temperature - Voltage Below Normal (Short to Low)
CAT-CID1635-FMI9 moderate
Transmission Data Link - Abnormal Update Rate (Data Link)
CAT-CID168-FMI3 moderate
Battery / System Voltage - Voltage Above Normal (Open/Short to High)
CAT-CID168-FMI4 moderate
Battery / System Voltage - Voltage Below Normal (Short to Low)
CAT-CID172-FMI3 moderate
Intake Air Temperature Sensor - Voltage Above Normal (Open/Short to High)
CAT-CID172-FMI4 moderate
Intake Air Temperature Sensor - Voltage Below Normal (Short to Low)
CAT-CID175-FMI3 moderate
Engine Oil Temperature Sensor - Voltage Above Normal (Open/Short to High)
CAT-CID175-FMI4 moderate
Engine Oil Temperature Sensor - Voltage Below Normal (Short to Low)
CAT-CID1796-FMI5 moderate
Fuel Pressure Regulator - Open Circuit
CAT-CID1796-FMI6 moderate
Fuel Pressure Regulator - Short Circuit
CAT-CID1835-FMI2 moderate
DPF Differential Pressure Erratic
CAT-CID1836-FMI3 moderate
DPF Differential Pressure Sensor - High
CAT-CID1836-FMI4 moderate
DPF Differential Pressure Sensor - Low
CAT-CID1837-FMI3 moderate
DPF Inlet Temperature Sensor - High
CAT-CID1837-FMI4 moderate
DPF Inlet Temperature Sensor - Low
CAT-CID1838-FMI3 moderate
DPF Outlet Temperature Sensor - High
CAT-CID1838-FMI4 moderate
DPF Outlet Temperature Sensor - Low
CAT-CID2-FMI3 moderate
Engine Coolant Temperature Sensor - Voltage High / Open Circuit
CAT-CID2-FMI4 moderate
Engine Coolant Temperature Sensor - Voltage Low / Short to Ground
CAT-CID2239-FMI5 moderate
Aftertreatment Injector - Open Circuit
CAT-CID2239-FMI6 moderate
Aftertreatment Injector - Short Circuit
CAT-CID2452-FMI13 moderate
VGT Actuator Calibration Required
CAT-CID2452-FMI3 moderate
VGT Actuator Circuit - Voltage High
CAT-CID2452-FMI4 moderate
VGT Actuator Circuit - Voltage Low
CAT-CID248-FMI9 moderate
CAT Data Link (CDL) - Abnormal Update Rate (Data Link)
CAT-CID412-FMI3 moderate
EGR Temperature Sensor - Voltage Above Normal (Open/Short to High)
CAT-CID412-FMI4 moderate
EGR Temperature Sensor - Voltage Below Normal (Short to Low)
CAT-INJ1-FMI7 moderate
Cylinder 1 Injector - Mechanical System Not Responding
CAT-INJ2-FMI7 moderate
Cylinder 2 Injector - Mechanical System Not Responding
CAT-INJ3-FMI7 moderate
Cylinder 3 Injector - Mechanical System Not Responding
CAT-INJ4-FMI7 moderate
Cylinder 4 Injector - Mechanical System Not Responding
CAT-INJ5-FMI7 moderate
Cylinder 5 Injector - Mechanical System Not Responding
CAT-INJ6-FMI7 moderate
Cylinder 6 Injector - Mechanical System Not Responding
CAT-SKIDSTEER-168-3 moderate
Battery / System Voltage Above Upper Limit
CAT-SKIDSTEER-168-4 moderate
System Battery Voltage Below Minimum Threshold
CAT-SKIDSTEER-1761-1 moderate
DEF Tank Level Below Warning Threshold
CAT-SKIDSTEER-SEAT-SWITCH-OPEN moderate
Operator Presence Seat Switch Reads Open
CAT-SPN100-FMI3 moderate
Oil Pressure Sensor - Voltage High
CAT-SPN100-FMI4 moderate
Oil Pressure Sensor - Voltage Low
CAT-SPN105-FMI0 moderate
Intake Manifold Temp Above Normal
CAT-SPN1761-FMI1 moderate
DEF Tank Level Low
CAT-SPN27-FMI3 moderate
EGR Valve Position Sensor - Voltage High
CAT-SPN27-FMI4 moderate
EGR Valve Position Sensor - Voltage Low
CAT-SPN3226-FMI2 moderate
NOx Sensor Outlet - Data Erratic
CAT-SPN3480-FMI7 moderate
Aftertreatment Fuel Pressure - Mechanical
CAT-SPN412-FMI1 moderate
EGR Temperature Below Normal
CAT-SPN625-FMI9 moderate
Proprietary CAT Data Link - Abnormal
CAT-SPN94-FMI1 moderate
Fuel Delivery Pressure Below Normal
CAT-SPN94-FMI3 moderate
Fuel Delivery Pressure Sensor - High
CAT-SPN94-FMI4 moderate
Fuel Delivery Pressure Sensor - Low
CAT-TH-168-4 moderate
Battery Voltage Below Minimum Operating Threshold
CAT-TH-1761-1 moderate
DEF Tank Level Below Warning Threshold
CAT-CID174-FMI3 minor
Fuel Temperature Sensor - Voltage Above Normal (Open/Short to High)
CAT-CID174-FMI4 minor
Fuel Temperature Sensor - Voltage Below Normal (Short to Low)
CAT-CID30-FMI3 minor
Ambient Air Temperature Sensor - Voltage Above Normal (Open/Short to High)
CAT-CID30-FMI4 minor
Ambient Air Temperature Sensor - Voltage Below Normal (Short to Low)
CAT-SPN107-FMI0 minor
Air Filter Restriction High
CAT-SPN108-FMI3 minor
Barometric Pressure Sensor - High
CAT-SPN108-FMI4 minor
Barometric Pressure Sensor - Low
CAT-SPN171-FMI3 minor
Ambient Air Temp Sensor - High
CAT-SPN171-FMI4 minor
Ambient Air Temp Sensor - Low
CAT-SPN3031-FMI2 minor
DEF Tank Temperature Erratic