Detroit Diesel DD13 / DD15 / DD16 Fault Codes
The Detroit Diesel DD-series inline-6 engines power the Freightliner Cascadia and Western Star 49X / 5700XE. The DD15 is the highest-volume Class 8 engine at Daimler Trucks North America. All three DD engines share a common architecture with Amplified Common Rail fuel injection, aftertreatment via an Aftertreatment Control Module (ACM), and J1939 SPN/FMI fault reporting.
106 fault codes documented· 3 engine variants · J1939 SPN/FMI + ACM codes · 2008 - present
Most Common Detroit Diesel Fault Codes
Showing 24 of 106 Detroit Diesel codes, sorted by severity. Each links to causes, diagnostics, common fixes, and repair cost estimates.
DD-100-1 critical
Engine Oil Pressure Low
DD-3246-0 critical
DPF Outlet Temperature Too High
DD-3464-31 critical
Cylinder Head Pressure Excessive
DD-5246-16 critical
SCR Inducement Severity Level 2
DD-629-12 critical
MCM Internal Failure
DD-101-0 serious
Crankcase Pressure High
DD-103-0 serious
Turbocharger Speed High
DD-1080-7 serious
Valve Train Timing Error
DD-110-0 serious
Engine Coolant Temperature High
DD-111-1 serious
Coolant Level Low
DD-1322-31 serious
Multiple Cylinder Misfire Detected
DD-1569-31 serious
Engine Protection Derate - Fuel
DD-157-0 serious
Fuel Rail Pressure Too High
DD-157-1 serious
Fuel Rail Pressure Too Low
DD-175-0 serious
Engine Oil Temperature High
DD-190-2 serious
Engine Speed Sensor Implausible
DD-3251-0 serious
DPF Differential Pressure Too High
DD-3364-18 serious
DEF Quality Poor
DD-3719-0 serious
DPF Soot Load Very High
DD-4334-1 serious
SCR Inlet DEF Pressure Low
DD-4364-17 serious
SCR Conversion Efficiency Below Threshold
DD-4765-0 serious
DOC Outlet Temperature Too High
DD-5246-15 serious
SCR Inducement Severity Level 1
DD-5394-7 serious
DEF Dosing Valve Not Responding
Detroit Diesel Engine Versions
| Engine | Years | Applications | Notes |
|---|---|---|---|
| DD13 | 2008-present | Freightliner M2 112, Cascadia (regional) | 12.8L inline-6 for regional haul and vocational. Lighter than DD15 for weight-sensitive fleets. |
| DD15 | 2008-present | Freightliner Cascadia, Western Star 5700XE/49X | 14.8L inline-6. Most common Class 8 engine at Freightliner. Amplified Common Rail fuel system. |
| DD16 | 2011-present | Western Star 4900/49X, heavy haul & vocational | 15.6L displacement for heavy haul, logging, and severe duty. Up to 600 HP / 2050 lb-ft. |
Common Detroit Diesel Issues
- Aftertreatment faults: ACM (Aftertreatment Control Module) codes, DEF doser, 1-box vs 2-box SCR differences
- EGR valve and EGR cooler issues, especially on pre-GHG17 platforms
- DD15 Amplified Common Rail (ACRS) high-pressure fuel system: pressure regulator, quantity control valve
- Variable geometry turbo (VGT / asymmetric turbo on DD15 Gen 5) actuator issues
- Coolant consumption / oil-in-coolant from failed EGR coolers or head gasket on high-mileage trucks