Detroit DD15 Symptoms

Common Detroit DD15 symptoms, what usually causes them, and how to narrow them down.

• Derate to 5 MPH (SCR / DEF Fault) — Detroit DD15 The truck limits speed to 5 mph due to aftertreatment inducement on a Detroit DD15. This is the final stage of SCR/DEF protection and is never the root cause…
• EGR Flow Problems — Detroit DD15 Diagnostic guide for EGR flow problems on Detroit DD15 (2010–present).
• Frequent Regens or DPF Restriction — Detroit DD15 Diagnostic guide for frequent regenerations and DPF restriction on Detroit DD15 (2010–present).
• Hard Start or Stalling — Detroit DD15 Hard starting or stalling on a Detroit DD15 is often fuel rail pressure related or a sensor supply voltage pulled low by a shorted sensor or harness.
• Loss of Power — Detroit DD15 Loss of power on a Detroit DD15 is commonly an aftertreatment derate, a restricted DPF, EGR flow problem, or a fuel rail pressure issue. Read codes from the…