Crankcase Pressure Sensor Signal High
The DD-101-3 (Detroit Diesel DD Series) diesel fault code means: Crankcase Pressure Sensor Signal High. This is a minor severity code.
This is a standard J1939 fault, not a proprietary code. DD-101-3 is how this equipment displays SPN 101 with FMI 3 (voltage above normal or shorted high) 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?
- Yes, but fix soon
- DIY difficulty
- intermediate
- Estimated cost
- $200-$900
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Common Symptoms
- Check Engine Light / Amber Warning Lamp illuminated
Probable Causes (Ranked by Likelihood)
- Failed CCP sensor Likely
- Open signal wire Possible
Step-by-Step Diagnostic Procedure
Back-probe sensor.
Replace if open.
Frequently Asked Questions
What is Detroit Diesel fault code DD-101-3?
Detroit Diesel fault DD-101-3 (SPN 101 FMI 3) indicates: Crankcase Pressure Sensor Signal High. It is a minor-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-101-3?
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-101-3?
Typical repair cost is $200-$900. 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.
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