Injector Cylinder #1 Current Above Normal
What does DD-651-6 mean?
The DD-651-6 (Detroit Diesel DD Series) diesel fault code means: Injector Cylinder #1 Current Above Normal. This is a moderate severity code.
Common Symptoms
- Check Engine Light / Amber Warning Lamp illuminated
- Rough idle or misfire
Probable Causes (Ranked by Likelihood)
- Shorted injector solenoid Likely
- Harness short to ground Likely
Step-by-Step Diagnostic Procedure
Coil resistance test — shorted reads <0.3 ohm.
Harness short-to-ground ohm test.
Replace injector.
Frequently Asked Questions
What is Detroit Diesel fault code DD-651-6?
Detroit Diesel fault DD-651-6 (SPN 651 FMI 6) indicates: Injector Cylinder #1 Current Above 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-651-6?
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-651-6?
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.