SPN 100 FMI 1
STOP
Oil pressure
Oil pressure is critically low: shut the engine down.
SPN 100 FMI 1: Oil pressure is critically low: shut the engine down. Stop: this is a stop-now code. Park safely and do not keep driving until it is checked.
Mechanical · Lubrication
What it means
Oil pressure dropped below the ECM minimum. This is the fault that destroys an engine fastest. Shut down as soon as it is safe and do not restart until pressure is confirmed with a mechanical gauge.
Most likely causes
Low oil level
Very likely
Failing oil pressure sensor or harness
Likely
Plugged oil filter or open bypass
Likely
Worn pump or bearings
Less likely
Tests, cheapest and most decisive first
1. Check oil level on the dipstick
Expected result: Level between the marks
2. Measure actual pressure with a mechanical gauge at the gallery port
Expected result: Matches the manufacturer spec
Tool: Mechanical gauge
Read it off your own dash
Take one photo and DERATE tells you whether you can keep driving.
DERATEDERATE assists. It does not replace inspection by a qualified technician.