Barometric Pressure Sensor Erratic
What does DD-108-2 mean?
The DD-108-2 (Detroit Diesel DD Series) diesel fault code means: Barometric Pressure Sensor Erratic. This is a minor severity code.
Common Symptoms
- Check Engine Light / Amber Warning Lamp illuminated
- Small power deficit at altitude
Probable Causes (Ranked by Likelihood)
- Failed baro sensor (inside ECM on DD15) Likely
- Harness fault Possible
Step-by-Step Diagnostic Procedure
Read baro reading via DDDL — should match altitude.
On DD15, baro is internal to the MCM — replace MCM if isolated.
Frequently Asked Questions
What is Detroit Diesel fault code DD-108-2?
Detroit Diesel fault DD-108-2 (SPN 108 FMI 2) indicates: Barometric Pressure Sensor Erratic. 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-108-2?
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-108-2?
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.