115 Caterpillar diagnostic codes on file — with the full diagnosis, repair steps, and field insights open to read free, no signup required.
Disclaimer: General reference information for trained, qualified technicians only. Codes and procedures vary by model, serial number and software version. Always follow the manufacturer's service manual and your site's safety procedures. Use at your own risk. Not affiliated with or endorsed by any manufacturer.
Find a Caterpillar code by searching below, or browse the table. Codes on file by system:
| Code | System | Symptom | Full fix |
|---|---|---|---|
| 036-0100-01 | — | Critical engine warning. Stop Engine light will flash. Risk of seizure. | View fix |
| 036-0110-03 | — | Engine triggers high-temp warning and power derate. Possible shutdown. | View fix |
| 036-0190-08 | — | Hard starting, engine coughing, or erratic tachometer readings. | View fix |
| 110-04 | — | The ECM detects a "Short to Ground." Engine may enter an immediate severe derate or shutdown to prevent perceived overheating. | View fix |
| 110-3 | Cooling System | Temp Gauge Maxed / High Idle. | View fix |
| 12 | C9 Flash Codes | Coolant Level Sensor | View fix |
| 1250-9 | Electrical | Remote Control Comm: Abnormal Update | View fix |
| 1250-9 | Network | Remote Control Inop / Lag | View fix |
| 13 | C9 Flash Codes | Fuel Temperature Sensor | View fix |
| 15 | C9 Flash Codes | Injection Actuation Pressure (IAP) | View fix |
| 1530-6 | Auxiliary | Coupler Won't Release | View fix |
| 1657-4 | Controls | Left Joystick Thumbwheel: Voltage Below Normal | View fix |
| 1657-4 | Controls | Left Tool Inop | View fix |
| 1658-4 | Controls | Right Joystick Thumbwheel: Voltage Below Normal | View fix |
| 1658-4 | Controls | Right Tool Inop | View fix |
| 21 | C9 Flash Codes | 5V / 8V Sensor Power Supply | View fix |
| 2265-7 | Hydraulic | Pump #1 Outlet Pressure Sensor: Not Responding | View fix |
| 2265-7 | Hydraulic | Slow Hydraulic Cycle Times | View fix |
| 2265-7 | Hydraulic | Machine Sluggish / Lugging | View fix |
| 2266-7 | Hydraulic | Erratic Main Pump Response | View fix |
| 2266-7 | Hydraulic | Pump #2 Outlet Pressure Sensor: Not Responding | View fix |
| 2348-9 | CAN Bus / Comms | Gauge Cluster Flash / Loss of Controls | View fix |
| 24 | C9 Flash Codes | Engine Oil Pressure Sensor | View fix |
| 2458-2 | Aftertreatment (DPF) | No Regeneration. The machine refuses to start a "Parked Regen"; Service light flashes. | View fix |
| 247-9 | Network | SAE J1939 Data Link: Abnormal Update | View fix |
| 247-9 | Network | Dash Blank / Limp Mode | View fix |
| 25 | C9 Flash Codes | Boost Pressure Sensor | View fix |
| 26 | C9 Flash Codes | Atmospheric Pressure Sensor | View fix |
| 27 | C9 Flash Codes | Coolant Temperature Sensor | View fix |
| 28 | C9 Flash Codes | Throttle Position Calibration | View fix |
| 3183-2 | Emissions | Aftertreatment Regeneration Device: Erratic | View fix |
| 3183-2 | Aftertreatment | Regen Inop / Fault Lamp | View fix |
| 32 | C9 Flash Codes | Throttle Position Signal | View fix |
| 3216-20 | Emissions | Regen Inop | View fix |
| 34 | C9 Flash Codes | Engine Speed Signal | View fix |
| 3413-5 | Electrical | Fuel Lift Pump Failure | View fix |
| 3413-5 | Engine | Rough Run / Miss | View fix |
| 3413-5 | Aftertreatment | Regen Fails / Engine Derate | View fix |
| 3427-5 | Aftertreatment (DEF) | Active Regen Disabled / E1025 Derate. | View fix |
| 3464-16 | — | Engine Hesitation. | View fix |
| 35 | C9 Flash Codes | Engine Overspeed Warning | View fix |
| 3510-3 | Electrical | Multiple Faults | View fix |
| 37 | C9 Flash Codes | Fuel Pressure Sensor | View fix |
| 3714-0 | Aftertreatment / DEF | Severe Engine Derate / Countdown | View fix |
| 38 | C9 Flash Codes | Intake Manifold Air Temp | View fix |
| 39 | C9 Flash Codes | IAP System Fault | View fix |
| 42 | C9 Flash Codes | Engine Timing Calibration | View fix |
| 46 | C9 Flash Codes | Low Oil Pressure | View fix |
| 51 | C9 Flash Codes | ECM Battery Power | View fix |
| 5246-15 | Aftertreatment | 90-Minute Derate Timer | View fix |
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