Engine Oil Pressure Low
The DD-100-1 (Detroit Diesel DD Series) diesel fault code means: Engine Oil Pressure Low. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- intermediate
- Estimated cost
- $2,500-$6,500
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Common Symptoms
- Check Engine Light / Amber Warning Lamp illuminated
- Red Stop Lamp on, engine derate or forced shutdown
- Engine shutdown imminent
Probable Causes (Ranked by Likelihood)
- Actually low oil pressure — bearing failure imminent Very Likely
- Failed oil pressure sensor Likely
- Plugged oil filter / cold thick oil Possible
- Oil pump pickup screen plugged Possible
Step-by-Step Diagnostic Procedure
STOP engine immediately — verify with a mechanical gauge before anything else.
Check oil level and condition.
If mechanical gauge confirms low pressure, do not continue operating.
Replace sensor only after mechanical confirmation of good pressure.
Frequently Asked Questions
What is Detroit Diesel fault code DD-100-1?
Detroit Diesel fault DD-100-1 (SPN 100 FMI 1) indicates: Engine Oil Pressure Low. It is a critical-severity fault and is commonly seen on DD13/DD15/DD16 engines in Freightliner and Western Star chassis.
Can I drive my Freightliner or Western Star with fault DD-100-1?
It depends on severity. Critical and serious faults trigger derate or engine shutdown — do not continue driving. Moderate faults usually allow continued operation short-term but schedule repair to prevent cascading aftertreatment damage.
How much does it cost to fix Detroit Diesel fault DD-100-1?
Typical repair cost is $2,500-$6,500. Sensor/harness fixes fall at the low end; turbo actuator, injector, aftertreatment component, or head gasket repairs fall at the high end. Detroit DDDL software and sometimes factory parameter reset are required for proper reset.
Sources
This page is built from documented references. Verify against your own service info before repair work.