Cylinder Head Pressure Excessive
The DD-3464-31 (Detroit Diesel DD Series) diesel fault code means: Cylinder Head Pressure Excessive. 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
- Exhaust in coolant
- Noticeable power loss under load
Probable Causes (Ranked by Likelihood)
- Head gasket failure (DD15 pre-GHG17) Very Likely
- Cracked cylinder head Possible
- Failed cup seal in head (DD15) Likely
Step-by-Step Diagnostic Procedure
Shop-level repair — pull head and inspect.
Look for cup seal failure (common DD15 issue).
Replace head gasket + new cup seals as an assembly.
Frequently Asked Questions
What is Detroit Diesel fault code DD-3464-31?
Detroit Diesel fault DD-3464-31 (SPN 3464 FMI 31) indicates: Cylinder Head Pressure Excessive. 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-3464-31?
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-3464-31?
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.