Proprietary Data Link Fault
What does DD-625-13 mean?
The DD-625-13 (Detroit Diesel DD Series) diesel fault code means: Proprietary Data Link Fault. This is a moderate severity code.
Common Symptoms
- Check Engine Light / Amber Warning Lamp illuminated
- Loss of some features
Probable Causes (Ranked by Likelihood)
- Broken Detroit proprietary link between MCM/CPC Likely
- Harness damage Possible
Step-by-Step Diagnostic Procedure
Verify CPC (Common Powertrain Controller) power and ground.
Check proprietary link harness.
Update firmware via DDDL.
Frequently Asked Questions
What is Detroit Diesel fault code DD-625-13?
Detroit Diesel fault DD-625-13 (SPN 625 FMI 13) indicates: Proprietary Data Link Fault. 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-625-13?
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-625-13?
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.