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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.

Browse all 106 Detroit Diesel codes →

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

Related Engines

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