Engine Oil Temperature High
The DD-175-0 (Detroit Diesel DD Series) diesel fault code means: Engine Oil Temperature High. This is a serious severity code.
Unverified. We could not confirm this code's definition against freely available manufacturer documentation, so treat the meaning, severity and fix guidance on this page as unconfirmed. Check it against the manufacturer's service information for your exact model and serial range before acting on it. This page is kept out of search engines for that reason, and we are working through this family manual by manual.
This is a standard J1939 fault, not a proprietary code. DD-175-0 is how this equipment displays SPN 175 with FMI 0 (data valid but above normal — most severe) under the SAE J1939 standard used across heavy equipment. The same SPN can appear on any J1939-compliant machine regardless of brand — so cross-referencing it against your engine maker's documentation is valid even when the equipment brand differs.
- Keep driving?
- No — stop driving
- DIY difficulty
- intermediate
- Estimated cost
- $1,200-$3,800
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View pilot availability →What Are the Symptoms of DD-175-0?
- Check Engine Light / Amber Warning Lamp illuminated
- Engine derate (reduced torque / 5 mph limp)
What Causes DD-175-0? (Most Likely First)
- Overloaded engine / heavy pull at low speed Likely
- Failed oil cooler Possible
- Coolant issue propagating to oil temp Possible
Can I Still Drive with DD-175-0?
No — stop driving. DD-175-0 is rated serious severity. Continuing to drive in this state risks further damage — get it looked at before your next trip.
Common Fixes by Vehicle
What techs usually find when diagnosing DD-175-0 on specific platforms — tap a platform for the fix and the exact part:
2008-2020 Freightliner / Western Star Detroit DD13/DD15 Moderate DIY
Engine oil temperature high (SPN 175 FMI 0). Check the oil-to-coolant heat exchanger for restriction - and verify coolant level and thermostat operation. A stuck-closed thermostat will cook the oil. If the oil cooler is plugged, reverse-flush or replace the bundle.
Labor: 2.0 hrsFrequently Asked Questions
What is Detroit Diesel fault code DD-175-0?
Detroit Diesel fault DD-175-0 (SPN 175 FMI 0) indicates: Engine Oil Temperature High. It is a serious-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-175-0?
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-175-0?
Estimated repair cost is $1,200-$3,800. 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.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose DD-175-0?
Correlate with coolant temp — usually rises together.
Inspect oil cooler for internal leaks (coolant in oil or vice versa).
Review operating profile — overloaded truck / low gear use.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J1939-73Application Layer: Diagnostics (defines the SPN/FMI fault-identifier framework)
Which Vehicles Commonly Get DD-175-0?
- Freightliner Cascadia with DD15
- Freightliner Cascadia with DD13
- Freightliner Cascadia with DD16
- Western Star 4700 with DD13/DD15
- Western Star 4900 with DD15/DD16
- Western Star 5700 XE with DD15
- Freightliner M2 106 with DD13
- Freightliner M2 112 with DD13
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