DEF Line Heater Short to Ground
What does DD-3058-4 mean?
The DD-3058-4 (Detroit Diesel DD Series) diesel fault code means: DEF Line Heater Short to Ground. This is a moderate severity code.
Common Symptoms
- Check Engine Light / Amber Warning Lamp illuminated
- DEF lamp in winter
Probable Causes (Ranked by Likelihood)
- DEF supply line heater pinched / chafed Likely
- Heater harness shorted Likely
Step-by-Step Diagnostic Procedure
Unplug DEF line heaters and ohm each to ground — none should read short.
Inspect line routing for pinch points near frame rail.
Replace failed heated line assembly.
Frequently Asked Questions
What is Detroit Diesel fault code DD-3058-4?
Detroit Diesel fault DD-3058-4 (SPN 3058 FMI 4) indicates: DEF Line Heater Short to Ground. 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-3058-4?
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-3058-4?
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.