Intake Manifold Temperature High
What does DD-105-0 mean?
The DD-105-0 (Detroit Diesel DD Series) diesel fault code means: Intake Manifold Temperature High. This is a moderate severity code.
Common Symptoms
- Check Engine Light / Amber Warning Lamp illuminated
- Engine derate (reduced torque / 5 mph limp)
- Noticeable power loss under load
Probable Causes (Ranked by Likelihood)
- Failed CAC (charge air cooler) — ineffective Likely
- Ambient heat soak at low speed Possible
- Sensor reading incorrect Likely
- Cooling fan not engaging Possible
Step-by-Step Diagnostic Procedure
Compare MAT to ambient — should be within 20F of ambient after cool start.
Inspect CAC core for bent fins or oil contamination.
Verify fan clutch engages at set point.
Replace MAT sensor if readings are implausible.
Frequently Asked Questions
What is Detroit Diesel fault code DD-105-0?
Detroit Diesel fault DD-105-0 (SPN 105 FMI 0) indicates: Intake Manifold Temperature High. It is a moderate-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-105-0?
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-105-0?
Typical repair cost is $500-$2,200. 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.