Injector Cylinder #4 Current Below Normal
What does DD-654-5 mean?
The DD-654-5 (Detroit Diesel DD Series) diesel fault code means: Injector Cylinder #4 Current Below Normal. This is a moderate severity code.
Common Symptoms
- Check Engine Light / Amber Warning Lamp illuminated
- Rough idle or misfire
- Noticeable power loss under load
- Black or white smoke from exhaust
Probable Causes (Ranked by Likelihood)
- Failed injector Likely
- Harness fault Likely
Step-by-Step Diagnostic Procedure
Cylinder cutout via DDDL to isolate #4.
Inspect harness.
Replace injector.
Frequently Asked Questions
What is Detroit Diesel fault code DD-654-5?
Detroit Diesel fault DD-654-5 (SPN 654 FMI 5) indicates: Injector Cylinder #4 Current Below Normal. 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-654-5?
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-654-5?
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.