DPF Outlet Temperature Too High
The DD-3246-0 (Detroit Diesel DD Series) diesel fault code means: DPF Outlet Temperature Too High. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- advanced
- Estimated cost
- $2,500-$6,500
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Common Symptoms
- Check Engine Light / Amber Warning Lamp illuminated
- Red Stop Lamp on, engine derate or forced shutdown
- Runaway regen
Probable Causes (Ranked by Likelihood)
- Excess fuel from leaking injector reaching DPF Likely
- Failed doser stuck open Likely
- Failed outlet temp sensor reading high Possible
Step-by-Step Diagnostic Procedure
STOP engine if temps exceed 1400F — DPF melt risk.
Inspect for leaking injector (fuel in oil?).
Verify doser is not stuck open.
Replace doser and DPF if substrate melted.
Frequently Asked Questions
What is Detroit Diesel fault code DD-3246-0?
Detroit Diesel fault DD-3246-0 (SPN 3246 FMI 0) indicates: DPF Outlet Temperature Too High. It is a critical-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-3246-0?
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-3246-0?
Typical repair cost is $2,500-$6,500. 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.
Sources
This page is built from documented references. Verify against your own service info before repair work.