Detroit DD13 & DD15 Diagnostics & Fault Code Mastery

About this course

Master the Detroit Diesel DD13 and DD15 platforms end-to-end. Learn the MCM/CPC/ACM architecture, read J1939 SPN/FMI codes with confidence, work Detroit wiring diagrams with a DVOM, and diagnose the DPF/DEF/SCR aftertreatment ladder. Four full case studies walk real tickets from complaint to fix.

1. 1

   DD13/DD15 Platform Architecture
   • 1. DD13 vs DD15 vs DD16: Knowing What You Have15m
   • 2. MCM, CPC & ACM: The Detroit Three-Module Network20m
   • 3. Sensors, Actuators & Tooling15m
2. 2

   Reading & Interpreting Fault Codes (SPN/FMI)
   • 1. SPN + FMI: The Universal Fault Language20m
   • 2. Pulling Codes with DiagnosticLink, JPRO & NexIQ15m
   • 3. Active vs Inactive, Derates & Lamps15m
3. 3

   Top 40 DD13/DD15 Fault Codes
   • 1. Top 40 DD13/DD15 Codes — Reference Table30m
   • 2. Prioritizing Multiple Active Codes15m
4. 4

   Wiring Diagrams & Electrical Diagnostics
   • 1. Reading a Detroit Wiring Diagram20m
   • 2. DVOM Techniques: Voltage Drop, Continuity, Reference Voltage20m
   • 3. J1939 CAN Bus Diagnostics15m
5. 5

   Aftertreatment: DPF, DEF & SCR
   • 1. DPF Regeneration Strategy20m
   • 2. SCR, DEF & NOx Sensors20m
   • 3. EGR Cooler, VGT & Turbo Actuator15m
6. 6

   Case Studies & Advanced Diagnostics
   • 1. Case Study: No-Start, No Codes20m
   • 2. Case Study: 5 mph Derate with SPN 322620m
   • 3. Case Study: Coolant Loss, No External Leak15m
   • 4. Final Playbook: The Detroit Diagnostic Method15m