42 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.
| 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 |
| 24 | C9 Flash Codes | Engine Oil Pressure Sensor | View fix |
| 27 | C9 Flash Codes | Coolant Temperature Sensor | View fix |
| 34 | C9 Flash Codes | Engine Speed Signal | View fix |
| 3413-5 | Engine | Rough Run / Miss | View fix |
| 3413-5 | Aftertreatment | Regen Fails / Engine Derate | View fix |
| 3464-16 | — | Engine Hesitation. | View fix |
| 35 | C9 Flash Codes | Engine Overspeed Warning | View fix |
| 3714-0 | Aftertreatment / DEF | Severe Engine Derate / Countdown | View fix |
| 42 | C9 Flash Codes | Engine Timing Calibration | View fix |
| 46 | C9 Flash Codes | Low Oil Pressure | View fix |
| 586-12 | Controls | Engine Speed Won't Change | View fix |
| 61 | C9 Flash Codes | High Coolant Temp | View fix |
| CA689 | Engine | Engine Speed Sensor: Erratic Signal | View fix |
| Code 1301 | Lubrication | Engine Shutdown / Warning Alarm | View fix |
| Code 1301 | Lubrication | Engine Shutdown / Warning Alarm | View fix |
| Code 1301 | Lubrication | Engine Shutdown / Warning Alarm | View fix |
| E001 (Level 3) | Cooling | Immediate Shutdown Warning. | View fix |
| E1389 FMI 3 | Emissions / SCR | Level 3 Inducement / Severe Engine Derate | View fix |
| E157-2 | Fuel System | Engine Stalling / High Load | View fix |
| E360 | Engine | Low Oil Pressure Alarm | View fix |
| E361 | Engine | Engine Over-Speed Warning / Safety Trip | View fix |
| MID 036 CID 0100 FMI 01 | Lubrication | Level 3 Red Stop Light / Engine Derate | View fix |
| MID 036 CID 0544 FMI 08 | Cooling | Engine Coolant Temp Creep / High Roar | View fix |
| MID 036 CID 2265 FMI 03 | Fuel Supply | Engine Sags under Heavy Push / Stumble | View fix |
| MID 087 CID 0420 FMI 05 | Electrical / Steering | Secondary Steering Active / Alarm | View fix |
| SPN 100 FMI 3 | — | Low oil pressure warning on dash; Possible engine derate; Gauge pinned to maximum or reading zero. | View fix |
| SPN 101 FMI 15 | Engine | Oil Leaking from Breather. | View fix |
| SPN 108 FMI 4 | — | Engine is "lazy"; Poor fuel economy; Struggles at high altitude. | View fix |
| SPN 111 FMI 1 | — | Warning light/Buzzer; Engine shutdown protection active; Potential coolant spray. | View fix |
| SPN 1569 FMI 31 | Engine Control | Engine Derate (Power Loss) | View fix |
| SPN 1569 FMI 31 | Engine Control | Engine Protection Derate. | View fix |
| SPN 157 FMI 18 | — | Engine Bogging. | View fix |
| SPN 190 FMI 0 | Engine | Engine Shuts Down / Red Light | View fix |
| SPN 190 FMI 0 | Engine | Logging / Overspeed | View fix |
| SPN 524285 FMI 2 | Transmission | Transmission Slippage / Erratic Shift | View fix |
| SPN 639 FMI 9 | — | Multiple gauges "dropping out"; Engine may stay at idle; Machine won't move; Multiple controllers "Timed Out." | View fix |
| SPN 94 FMI 3 | — | Engine "stumble" under load; Hard starting; Low power. | View fix |
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