DEF Dosing Unit Current Above Normal
What does DD-3361-6 mean?
The DD-3361-6 (Detroit Diesel DD Series) diesel fault code means: DEF Dosing Unit Current Above Normal. This is a moderate severity code.
Common Symptoms
- Check Engine Light / Amber Warning Lamp illuminated
- DEF warning lamp with countdown
Probable Causes (Ranked by Likelihood)
- Shorted DEF doser solenoid Likely
- Wiring harness short to ground Likely
- ACM driver circuit damaged Possible
Step-by-Step Diagnostic Procedure
Disconnect doser and measure coil resistance; confirm short.
Unplug harness and ohm each wire to ground looking for short.
If wiring is clean, replace doser.
If fault persists after doser and harness, inspect ACM connector for bent pins.
Frequently Asked Questions
What is Detroit Diesel fault code DD-3361-6?
Detroit Diesel fault DD-3361-6 (SPN 3361 FMI 6) indicates: DEF Dosing Unit 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-3361-6?
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-3361-6?
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.