10 Cummins 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 |
|---|---|---|---|
| 5177 | Turbo | Severe Derate / VGT Frozen | View fix |
| Cummins 112/113/114 (635) | Turbo | Turbo Lag / Low Boost. | View fix |
| P00AF | Turbo | Severe Derate | View fix |
| SPN 103 FMI 2 | — | Turbo "whining"; Erratic boost; Low power; Whistling sound under load. | View fix |
| SPN 132 FMI 2 | Air Intake | Black Smoke / Engine Sags | View fix |
| SPN 190 FMI 0 | — | High-pitched engine whine; Sudden surge in RPM; Possible "Runaway" if oil-fed; Check Engine Light. | View fix |
| SPN 3242 FMI 15 | Emissions / DPF | Regen Aborted / High EGT Warning | View fix |
| SPN 641 FMI 7 | Air Intake | Low Boost / Heavy Sluggish Pick-up | View fix |
| SPN 641 FMI 7 | Air Intake | Low Boost / Sluggish Acceleration | View fix |
| SPN 641 FMI 9 | — | Turbo boost is stuck or erratic; Engine feels underpowered; No turbo "spool" sound; Active stop lamp. | View fix |
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