Caterpillar Fault Code
Free · no signupSPN 100 FMI 3
Low oil pressure warning on dash; Possible engine derate; Gauge pinned to maximum or reading zero.
System
Not specified
Symptom
Low oil pressure warning on dash; Possible engine derate; Gauge pinned to maximum or reading zero.
Diagnosis & fix steps
LOGIC: Open circuit/Short to 5V.
ACTION: Check oil level. Unplug sensor; verify 5V ref and ground. Jumper Signal to Ground to check for FMI 4 transition.
FIX: Replace sensor or repair harness break near engine block.
Red Seal field insights
If engine is knocking, STOP. If it sounds fine, it is likely a sensor failure.
Track this across your whole fleet
This code is free to read. AM Fleet Integrity lets your team log fault codes against assets, plus the full fault-code library, QR operator reporting, PM scheduling and predictive alerts. Start free — no credit card required.
Start your free trialRelated Caterpillar fault codes
- SPN 101 FMI 15Oil Leaking from Breather.
- MID 087 CID 0420 FMI 05Secondary Steering Active / Alarm
- SPN 102 FMI 18Power Loss / Black Smoke
- MID 087 CID 0373 FMI 05Service Brakes Locked / Alarm Active
- MID 082 CID 0568 FMI 07Brake Warning / High Pedal Effort
- MID 039 CID 0296 FMI 09VIMS Dash Blank / Shift Inhibited
- SPN 102 FMI 3Low power; Excessive black smoke; Poor throttle response; "Lazy" turbo feel.
- MID 036 CID 2265 FMI 03Engine Sags under Heavy Push / Stumble
- SPN 108 FMI 4Engine is "lazy"; Poor fuel economy; Struggles at high altitude.
- MID 036 CID 0544 FMI 08Engine Coolant Temp Creep / High Roar